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Research Article

Phenotypic Stability for Selected Traits of Some Cowpea Lines in Nigerian Agro-ecologies

Plant Breeding and Biotechnology 2017;5(2):67-77.
Published online: June 1, 2017

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*Corresponding author Victoria M. Yilwa, vmyilwa@yahoo.com, Tel: +234-8039410477
• Received: February 10, 2017   • Revised: April 17, 2017   • Accepted: April 30, 2017

Copyright © 2017 The Korean Society of Breeding Science

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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  • Eight advanced breeding lines of cowpea [Vigna unguiculata (L.) Walp.] were evaluated in a multi-environment trial for phenotypic stability of grain yield, maturity and grain size. There was highly significant genotype × environment interaction for all traits. Simple correlation coefficient was computed to ascertain the level of relationship between stability parameters and agronomic traits. Line IT93K-452-1 was identified as most stable genotype and can be grown all over the Nigerian cowpea belt. The line IT90K-503-1 was the most unstable genotype in terms of grain yield and was also nonresponsive to the environment. However, it is environment specific. IT93K-452-1 has relatively stable maturity across environments. The result suggests that IT93K-452-1 will mature around the average of 65 days irrespective of the location in Nigeria. Lines IT95K-1455 and IT90K-503-1, whose stability parameter values were high, means that in respect of maturity, they are photo-thermo sensitive. They can mature early or delayed depending on the photo-thermal environment. However, lines such as IT93K-273-2-1, IT93K-129-4, IT93K-452-1 and IT86D-719 are photo-thermo insensitive. Line IT93K-1543 was identified as the most desirable genotype in terms of grain size. This is followed by IT93K-452-1. The line IT90K-503-1 had small but unstable seed size. This work identified IT93K-452-1 and IT93K-273-2-1 as the most stable genotypes for yield and maturity. Grain yield was highly positively correlated with bi and R2 but was negatively correlated with Sd2i. Maturity was negatively highly correlated with bi, Wi, and CVi. Grain size on the other hand is not correlated with any of the parameters.
Cowpea [Vigna unguiculata (L.) Walp.] is an important source of cheap protein for human (Quin 1997) and fodder for livestock (Tarawali et al. 1997). The crop, through its nitrogen fixing ability, improves the fertility of the marginal soils characteristic of the semi-arid ecology (Carsky et al. 2002; Bado et al. 2006). Cowpea has been reported to contribute between 35 and 40 kg nitrogen per hectare/ha in a cowpea-millet rotation (Bagayoko et al. 1998). The crop is also a source of income especially for women who prepare and sell several food products from the crop (Ishiyaku 2001; Ibro et al. 2006). Nigeria, with annual production of 2.17 million tons from 5 million ha (FAOSTAT 2002), is the largest producer and consumer of cowpea in the world. Even with this seemingly huge production, Nigeria continues to suffer deficit in its national cowpea requirement. This deficit has been put as between 200,000 to 500,000 metric tons annually (Langyintuo et al. 2003). Nigeria’s deficit for cowpea requirement is mostly met through imports from neighboring countries such as Niger, second major producer in the world (Langyintuo et al. 2003). Other major world cowpea producers include Brazil, Burkina Faso and Cameroon. Cowpea is also important in Eastern and Southern Africa such as Sudan, Uganda, Mozambique, Tanzania, Mali and Senegal. Deficit in Nigeria’s national crop requirement including cowpea has been attributed to growth in population, use of varieties with low yield potential among others (Mustapha 2003). Mustapha (2003) identified genetic improvement as one of the most sustainable and environment-friendly means of providing more food to the teaming population of Nigeria.
In the last two decades the Institute for Agricultural Research (IAR), Ahmadu Bello University, Zaria, in collaboration with the International Institute of Tropical Agriculture (IITA) Ibadan has developed several cowpea varieties with high yield potential and qualities acceptable to the Nigerian consumers. However, these varieties have now lost their genetic superiority as a result of susceptibility to new production and or processing constraints such as susceptibility to striga (Striga hermonthica) (Emechebe and Lagoke 2002), bruchid (Callosobruchus maculatus), ease of processing for food, etc. In addition, great advances have been made in the understanding of the genetics of resistance to many diseases (such as bacterial blight, scab, and septoria leaf spot); pests (such as aphids and thrips); parasitic flowering plants (such as striga and alectra) and drought. Comprehensive review of the genetics of these traits is given in Fery and Singh (1997) and Singh (2002). The advances made in the genetics of cowpea has led to the development of more superior genotypes with over 20% higher yield potential and better quality traits such as shorter cooking time and increased protein content than in the older varieties (Singh et al. 2002). However, having genotypes with specific resistance and/or tolerance genes is not enough. Results of multi-environment evaluation of varieties of crops (Ado and Ishiyaku 1999) have indicated that some varieties tend to interact with specific test sites and exhibit unexpected performance in some locations while others show relatively stable yields across environments. The degree of such interaction between a variety and the different environments determines whether or not a variety is released to a wide or narrow production belts. Only after ascertaining the adaptability of such genotypes to specific locations in which they would be grown will they be released to farmers for commercial production with high degree of confidence with regard to their productivity. Therefore, it is of paramount importance to the breeder, knowledge of how widely across various ecologies/niches can genotypes developed be grown.
Several methods for determining performance stability and adaptation of varieties have been proposed. The parametric statistics used to measure stability of crops include Finlay and Wilkinson’s (1963) bi, the regression coefficient of varieties on environmental index. The environmental index is estimated as the difference between the marginal means of an environment and the overall mean. The bi classifies genotypes according to their stability under different conditions. A genotype is defined as stable when its bi is equal to zero. Eberhart and Russell (1966) proposed that stable varieties are those with high mean performance, bi = 1 and the average deviation from regression Sd2 equal to zero. Sd2 is used as a measure of phenotypic stability of the tested genotypes. Francis and Kannenberg (1978) used the coefficient of variability CVi of the variety across environment mean- a variety is stable if its CVi value is relatively low. CVi measures genotype stability. The contribution of the variety variance to the total genotype × location variance was considered as measure of stability. The lower the relative contribution of a genotype to the G × E variance, the more stable Wi (Wricke 1962). Wi refers to the relative contribution of each genotype to G × E interaction effects across all environments. It determines stability. Low Wi indicates stable genotype. Lin et al. (1986) in their analysis of the relative efficiency of these parameters in estimating stability concluded that the relevance of these parameters depends on the nature of the dataset.
Our aim is to report the phenotypic stability for grain yield, maturity and seed size of some advance cowpea breeding lines evaluated across the Nigerian agro-ecologies in order to identify most stable lines as well as to select stability parameters that are most related with the agronomic traits.
Accessions
Nine elite breeding lines including a check were evaluated in 1996 and 1997 at different locations. List of the varieties and their brief description is given in Table 1.
Evaluation locations
Evaluation of the varieties was conducted in nine different locations, spreading across the different ecologies in which cowpea is likely to be grown in Nigeria. The description of these locations is presented in Table 2.
Experimental design, crop management and data collection
Experiment in each of the environments was laid out as a randomized complete block design replicated three times. Plot size was 4 rows of 4 m length. Spacing was 75 cm and 20 cm for between rows and within rows, respectively. There were two stands per hill. The two middle rows were used for data collection. All recommended management practice for cowpea was observed. Maturity was scored as the number of days taken from sowing to when 90% of pods in the net plot reached maturity. At maturity, plants were harvested and threshed. Total grain harvested from each plot was weighed using a balance (0.1 g sensitive) and recorded as grain yield per plot. This weight was then converted to per hectare basis. Grain size was measured as the weight of 100 grains after sun drying. An average from three samples was used in the analysis to obtain a value for each plot. The data was then subjected to analysis of variance using the SAS statistical package (SAS Institute 1996). Means were separated following the Student-Neuman-Keuls. Stability parameters, bi of Finlay and Wilkinson (1963), CVi, of Francis and Kannenberg (1978), Sd2i of Eberhart and Russel (1966) and Wi of Wricke (1962) were estimated for each genotype. Varieties were categorized as stable or not on the basis of these parameters. Association between the four stability parameters on one side and the three agronomic traits, yield, maturity and grain size was estimated in order to identify most relevant measure of stability for each of the traits.
Data analysis
In order to estimate yield, the following stability parameters were calculated:
  • Regression coefficient, bi=1+i(Xij-X¯i.-X¯.j+X¯..)(X¯.j+X¯..)j(X¯.j+X¯..)2

  • Mean of regression deviation, Sd2i=1E-2[i(Xij-X¯i.-X¯.j+X¯..)2-(bi-1)2i(X¯.j+X¯..)2]

  • Coefficient of variation, CVi=(Si2X¯i.)×100

  • Wricke’s ecovalence, Wi=i=1n(Xij-X¯i.-X¯.j+X¯..)2

Where Xij is the mean performance of genotype i in environment j. i. and j are the mean yield of genotype i and environment j respectively, and X is the overall mean. E is the number of environments.
Grain yield
The result for the analysis of variance for grain yield is shown in Table 3. It shows highly significant difference among the genotypes (P<0.01). The highest mean yield across locations was recorded in IT93K-452-1 (0.89 t/ha) (Table 4). It out yielded the check, IT86D-719 by 0.15 t/ha. However, not all the varieties yielded equally across the eleven locations. Some varieties were higher yielding in some locations but not in others. This is indicated by the analysis of variance where mean square for genotype by location was highly significant (Table 3). For example, the variety IT95K-1543 was the highest yielding at Ibadan and Bauchi but not in the other remaining sites. Similarly, although the average yield of IT90K-503-1 was 0.59 t/ha, it yielded over 2 tons/ha in Gombe. This shows the need for maintaining these locations for effective varietal selection.
According to Table 4, Gombe, situated in the Sudan Savanna, is the most productive location with an average grain yield of 1.73 t/ha. This is followed by Ibadan with a grain yield of 1.40 t/ha. This may seem surprising because Ibadan is situated at around 7°N outside the natural cowpea zones in the derived Savannah, however, rain pattern in September to October resembles the rainy regime of Sudan Savannah in July to October (Singh 1993). This facilitated the productivity of cowpea in that agro-ecology. Samaru, though in the Northern guinea savanna, a good ecology for cowpea (Singh 1993), turned out to be the least yielding location, 0.37–0.41 t/ha. Similarly the yield for Kano2 was relatively low compared to Kano1. The cowpea was planted under intercrop with millet in Kano2 and with maize in Samaru1. This is not unexpected as the shading effect of the cereals reduce cowpea yields (Terao et al. 1997).
Grain yield stability
The result for stability analysis is shown in Table 5. The result shows that no single genotype was better, based on the stability parameters. However, line IT93K-452-1 was identified as the most stable genotype based on its high grain yield: bi of unity, lowest value of Wi, greater than 0.800 R2 value and low CVi value (< 11%), and it can be grown all over the Nigerian cowpea belt. The next stable genotype is IT93K-273-2-1. The line IT90K-503-1 was the most unstable genotype in terms of grain yield for having the largest value of Wi. With lowest bi value (0.600) the variety is also non responsive to the environment thereby giving low yield no matter what input was applied. However, its high CVi suggests that it is environment specific. Similarly, Ado and Ishiyaku (1999) used the magnitude of bi to classify pepper genotypes for stability of fruit yield.
Maturity
The result for the analysis of time taken to maturity is presented in Table 6. There was highly significant difference among the lines for these traits. Similarly both the location and genotype by location interaction mean squares were highly significant (P<0.001). This suggests that some genotypes matured earlier in some locations but were relatively late in other locations. For example one of the two earliest genotypes, IT90K-503-1, matured in 63 days on the average (Table 6). However, it matured two and three weeks later in Mokwa and Kano, respectively. IT95K-1543 was the latest maturity line (Table 6). Bauchi and Samaru 1 were the earliest (63 days) and latest (83 days) cowpea maturity environments, respectively.
The result of the stability analysis for days to maturity is presented in Table 7. The result shows that bi varied from less than unity in lines like IT93K-273-2-1 to greater than unity in IT95K-1455. The lines IT93K-452-1, IT95K-1543, IT93K-273-2-1, IT93K-129-4 and the check IT86D-719 all have bi values less than unity (0.444–0.621). This suggests that irrespective of the climatic characteristics of an environment, where this test was conducted, they come into maturity around their genetic potential. This suggests not only the photo-insensitive nature of these lines but that they are also insensitive to temperature (within the range in this experiment) in respect of reproductive development. This trend of stability on the basis of bi is similar to that using CVi and Wi. The genotypes IT93K-129-4, IT93K-273-2-1, IT95K-1543, IT93K-452-1 and IT86D-719 exhibited stable maturity across the environments.
However, the remaining lines, IT94K-410-2, IT95K-1455 and IT90K-503-1, even though relatively early maturing (< 70 days), have bi values larger than unity. Similarly these genotypes have relatively high CVi and Wi values indicating unstable maturity time. These genotypes are therefore, sensitive to photothermal conditions of the environments with regard to time to maturity. To get them to mature early, they should be planted when temperatures are near optimum, around 28°C and photoperiod shorter than the critical value of 12 hd−1 as reported by Craufurd et al. (1996)
Grain size
The results of the analysis of variance for grain size are presented in Table 8. The result shows highly significant differences among the genotypes, location as well as the interactions between genotypes and locations. Out of the seven locations where the lines were evaluated for this trait largest grain size was observed at Mokwa. The smallest grains were observed in Bauchi (12 g/100 seeds) and Uyo (13 g/100 seeds). The line, IT95K-1543 had the largest grain size of 16 g/100 seeds while IT90K-503-1 and IT93K-273-2-1 had the smallest grain size of 12 g/100 seeds each (Table 8). However as indicated by the statistical significance of the interaction between genotypes and locations for this trait, grain size of some lines differed from one location to another. For example, the line IT94K-410-2 even though had mean grain size of 14.2 g/100 seeds but it measured up to 18 g in Mokwa. Similarly, IT93K-452-1 with an average of 15 g had grain size of up to 19 g in Ile-Ife. However, other genotypes such as IT93K-129-4 showed near constant grain size over these test locations.
The result for stability analysis for grain size is presented in Table 9. The result shows that only three lines, IT94K-410-2, IT95K-1455 and IT90K-503-1 had bi values of greater than unity, 1.858, 1.444 and 1.726, respectively. This is supported by a corresponding high CVi and Wi values for all the three lines. This suggests that grain size in those lines is environment dependent. For the remaining five test lines however, the bi values were less than unity (0.444-0.842). Similarly the deviations from regression Sd2i were smaller than unity. This suggests that the environment has insignificant effect on the grain size of IT93K-452-1, IT95K-1543, IT93K-273-2-1, IT93K-129-4 and IT86D-719.
The result of the test of association between grain yield and the various stability parameters is presented in Table 10. It shows that bi, and R2 where highly significantly correlated with grain yield. While Sd2i and Wi were significantly negatively correlated with grain yield. The stability parameters bi is only correlated with R2 meaning to measure the stability of grain yield, score on all the other parameters Sd2i, Wi and CVi are required.
The result of the test of association between the stability parameters and days to maturity in Table 11. The result shows that maturity is highly negatively correlated with bi, CVi and Wi but not with R2. In addition the parameters CVi and Wi were highly correlated with bi suggesting that scoring stability for maturity on bi alone is as good as scoring on either CVi or Wi. Since CVi is highly significant correlated with Wi (Table 11). These results suggest that the stability of genotypes for time to maturity can be best measured by bi.
Result of the analysis of association between grain size and the various stability parameters were not significant (Table 12). However, bi is highly correlated with both CVi and R2 Based on these results it is not clear which of the parameters is best suitable for scoring genotypes for stability of grain size.
The result of the multi-environment testing of these elite cowpea lines have revealed that there is a huge interaction between genotypes and the locations of testing for all the three traits, grain yield, maturity and grain size. This is not surprising as the test environments span not only a wide area of over 800 km along the North-to-East transect of Nigeria (7°–12° N) but also covers from the dry savanna to the moist forest ecological zones, with annual total rainfall of about 800 mm and more than 2000 mm, respectively. This further underscores the need to evaluate cowpea lines in different locations. A line such as IT93K-452-1 with an average yield of almost a ton per hectare has a stable yield based on its stability parameters and can be recommended for production in all the agro-ecologies in Nigeria. In addition those with less stable yield with equally high mean yield such as IT93K-129-4 can yield as high as 2 tones/ha in specific environments even though they may exhibit low productivity in other environments. Such lines should be released for production in only those specific locations. The line IT93K-273-2-1 is the most suitable for production at Ile Ife while the best lines for the forest zones, like Uyo are IT93K-129-4 and the check, IT86D-719. The average yield of 0.75 t/ha (Table 7) may look low, however, given the range of 0.15–2.06 t/ha (Table 4), shows that the real yield potential of early cowpea varieties is high. Some varieties can yield as high as 2 tones/ha.
In terms of duration to maturity early maturing varieties mature earliest in 56 days and can be delayed to 83 days depending on the location. The variation in this trait is around 50% due to the interaction of genotypes with locations. Generally warmer locations such as Bauchi were earlier in maturity compared to relatively cooler locations like Mokwa and Samaru. Craufurd et al. (1996) and Ehlers and Hall (1997) both concluded that for some genotypes of cowpea if photoperiod is not limiting temperature is the determinant for rate of reproductive development. Craufurd et al. (1996) gave around 28°C as the optimum average temperature for reproductive development of cowpea. Although the temperatures during this evaluation were apparently sub-optimal some sites might have influenced rate of reproductive development more than others. This necessitates the testing of lines in specific sites before final recommendation.
As important as grain size this work has shown that it can be influenced by environmental condition under which it is estimated. Although variation among the genotypes is statistically significant, the range for seed size between locations is narrow (12–16 g/100 seeds). In an earlier study, Ishiyaku and Singh (2003) reported a grain size of up to 33 g/100 seeds. The range observed here could be termed medium size. This means that early maturity is synonymous with medium grain size.
The development of a variety involves the contribution of several individuals and corporate organizations. We therefore wish to express our sincere gratitude to the International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria for providing IAR with the initial germplasm for the development of these varieties. We also wish to appreciate the immense contributions made by our numerous collaborators in the Nationally Coordinated Research Project (NCRP) particularly, IAR&T, UNAAB, LCRI, KNARDA, KTARDA, ATBU, JARDA and others for assisting in the conduct of the on-farm or on-station evaluations. We thank the Director Institute for Agricultural Research, A.B.U. Zaria, Dr S.M. Misari and the Program Leader Legume and Oilseeds, Prof. C.I. Amatobi for all their support. The contributions of SG 2000 and PEDUNE Project in the conduct of the on-farm trials are highly appreciated.
Table 1
List of cowpea varieties evaluated in the early maturing multi-environment trial in 1996 and 1997 rainy season, Nigeria.
Table 1
Genotypes Development Institute Description
IT93K-452-1 IITA, Kano Station Semi-erect, early, white grain, black eye
IT95K-1543 IITA, Kano Station Semi-erect, early, brown grain
IT93K-273-2-1 IITA, Kano Station Semi-erect, early
IT93K-129-4 IITA, Kano Station Erect, early
IT86D-719 IITA, Kano Station Check, erect, early, white grain, brown eye
IT934K-410-2 IITA, Kano Station Semi-erect, early
IT95K-1455 IITA, Kano Station Erect, early, white grain
IT90K-503-1 IITA, Kano Station Semi-erect, early, white grain
Table 2
Agro-ecological description of test locations used in the evaluation of early maturing cowpea varieties for adaptation in Nigeria.
Table 2
Description Locations

Abeokuta Ile-Ife Bauchi Gombe Kano1 Kano2 Mokwa Samaru1 Samru2 Ibadan Uyo
Coordinate 7° 10′N: 3° 20′E 7° 28″ N; 4° 33″ E 10° 18″ N; 9° 50″ E 10° 16″ N; 11° 10″ E 12° 01″ N; 8° 30″ E 12° 01″ N; 8° 30″ E 9°17″ N; 5° 03″E 11°11″N 07° 38″ E 11°11″N 07° 38″ E 7° 21′N; 3° 50′E 4° 58′N; 7° 55′E
Soil type Alfisols Alfisols Alfisols Alfisols Inceptisols Inceptisols Alfisols Ultisols Ultisols Alfisols Ultisols
Growing days 180 180 150 120 90 90 190 150 150 180 270
Annual rainfall (mm) 1195.4 1195 1101 981 800 800 1050 1011 1011 1278 > 2500
Agro-ecology Forest cum derived savanna Forest Northern Guinea savanna Sudan savanna Sudan savanna Sudan savanna Southern Guinea savanna Northern Guinea savanna Northern Guinea savanna Forest Forest
Table 3
Mean squares for grain yield, days to pod maturity and seed size for early maturing cowpea varieties tested for two years and in different locations in Nigeria.
Table 3
Source Degrees of Freedom Mean Square

Grain yield Maturity Seed size
Genotypes 7 379755.2** 710.097** 52.272**
Location 9 359927.0** 4040.771** 190.315**
Genotype × Location 63 264594.6** 389.565** 22.344**

**Stand for significant at the 0.01 probability level.

Table 4
Grain yield (t/ha) of some early maturing varieties tested in a multi-environment evaluation in Nigeria.
Table 4
Genotypes Locations

Abeokuta Bauchi Gombe Ile-Ife Kano 1 Kano 2 Mokwa Samaru1 Samaru2 Ibadan Uyo Meanz)
IT93K-452-1 0.67 1.40 1.77 0.69 1.09 1.07 1.19 0.47 0.47 1.43 0.87 0.89a
IT95K-1543 0.56 1.60 1.72 0.49 1.36 1.02 0.92 0.35 0.27 1.74 0.50 0.87ab
IT93K-273-2-1 0.53 1.32 1.48 0.82 1.43 0.65 0.82 0.42 0.35 1.35 0.64 0.82ab
IT93K-129-4 0.73 1.16 2.06 0.76 1.01 0.46 0.85 0.30 0.19 1.26 1.03 0.80ab
IT86D-719 0.51 1.45 1.69 0.34 0.84 1.54 0.77 0.48 0.46 1.18 1.06 0.73bc
IT94K-410-2 0.69 1.21 x) 0.67 1.38 0.39 0.77 0.51 0.38 1.23 0.54 0.66dc
IT95K-1455 0.82 1.32 1.40 0.76 1.00 0.13 0.96 0.34 0.34 x) 0.56 0.63cd
IT90K-503-1 0.59 1.17 2.06 0.41 0.49 0.52 0.99 0.44 0.52 1.40 0.49 0.59d
Location meany) 0.64ef 1.33b 1.73a 0.62ef 1.08c 0.55fg 0.91d 0.41g 0.37g 1.40b 0.71de 0.86

z)Means of varieties which are designated by the same letters are not significantly different according to DMRT at the 0.05 probability level.

y)Location means which are designated by the same letters are not significantly different according to DMRT at the 0.05 probability level.

x)Missing value because of unavailable data due to unforeseen circumstances during the trial in these locations.

Table 5
Means and estimates of stability parameters for grain yield (t/ha) of some early maturing cowpea varieties tested in different agro-ecologies in Nigeria.
Table 5
Genotypes Parametersz)

Mean bi Sd2i R-square CVi Wi
IT93K-452-1 0.89 1.016 10347.64 0.826 50.3 1600433.68
IT95K-1543 0.87 1.203 −2080.29 0.766 63.3 3519134.53
IT93K-273-2-1 0.82 1.045 8408.89 0.801 56.9 1993556.29
IT93K-129-4 0.80 1.115 −10928.64 0.860 59.5 3245170.67
IT86D-719 0.73 0.929 −2128.57 0.662 62.1 3245170.67
IT94K-410-2 0.66 0.930 1764.66 0.519 62.2 3771486.70
IT95K-1455 0.63 0.881 −2128.12 0.616 67.2 3068034.64
IT90K-503-1 0.59 0.600 1893.7 0.309 60.5 4504546.79
Grand Mean 0.75 0.858 572.14 0.595 53.56 2771948.22

z)bi, Sd2i, CVi, and Wi stand for regression coefficient, deviation from regression, coefficient of variability, and Wricke’s ecovalence, respectively.

Table 6
Days taken to 90% pod maturity for early maturing cowpea varieties tested in a multi-environment evaluation in Nigeria.
Table 6
Genotypes Locations

Abeokuta Bauchi Ile-Ife Kano 1 Kano 2 Mokwa Samaru1 Samaru 2 Ibadan Uyo Meanz)
IT93K-452-1 75.3 57.6 70.0 62.6 68.0 76.0 81.6 76.6 65.0 68.0 71.0ab
IT95K-1543 77.0 62.0 69.0 75.1 72.0 76.0 86.0 79.0 63.0 68.0 74.7a
IT93K-273-2-1 77.8 66.0 70.0 65.3 70.0 75.6 83.1 76.6 65.0 68.0 73.0ab
IT93K-129-4 76.5 63.0 68.6 70.3 74.3 77.0 81.3 78.0 65.5 68.0 73.3ab
IT86D-719 75.3 59.3 68.6 68.6 69.3 76.6 85.5 83.3 66.5 68.0 73.3ab
IT94K-410-2 75.8 65 69.3 65.0 70.0 74.0 82.0 80.0 64.0 68.0 67.4bc
IT95K-1455 75.3 67 68.0 70.0 72.0 75.0 84.5 80.3 68.0 68.0 64.7c
IT90K-503-1 66.6 61 68.6 52.3 50.0 77.0 81.5 80.3 66.5 75.0 62.8c
Location meany) 75.0bc 62.6e 69.0cd 66.1d 68.2d 76.0bc 83.2a 79.2ab 65.4d 69.0dc 71.3

z)Means of varieties which are designated by the same letters are not significantly different according to DMRT at the 0.05 probability level.

y)Location means which are designated by the same letters are not significantly different according to DMRT at the 0.05 probability level.

Table 7
Means and estimates of stability parameters for days to pod maturity of some early maturing cowpea varieties tested in different agro-ecologies in Nigeria.
Table 7
Genotypes Parametersz)

Mean bi R-square CVi Wi
IT93K-452-1 71 0.585 0.780 11.0 1333.78
IT95K-1543 75 0.534 0.635 10.5 1890.61
IT93K-273-2-1 73 0.444 0.546 9.7 2348.50
IT93K-129-4 73 0.431 0.699 8.2 2005.36
IT86D-719 73 0.621 0.804 11.1 1177.45
IT94K-410-2 67 1.692 0.866 32.8 4514.99
IT95K-1455 65 1.933 0.839 39.7 7770.41
IT90K-503-1 63 1.803 0.760 38.5 8279.27
Grand mean 70 1.005 0.741 20.2 3665

z)bi, Sd2i, CVi, and Wi stand for regression coefficient, deviation from regression, coefficient of variability, and Wricke’s ecovalence, respectively.

Table 8
Grain size (g/100 seeds) for early maturing cowpea varieties tested in multi-environment evaluation in Nigeria.
Table 8
Genotypes Locations

Abeokuta Bauchi Ile-Ife Mokwa Samaru1 Samaru 2 Uyo Meanz)
IT93K-452-1 15.4 12.0 19.3 16.5 16.0 16.6 15.3 15.2ab
IT95K-1543 15.0 12.5 15.3 17.6 18.3 18.4 15.0 16.1a
IT93K-273-2-1 14.1 9.0 12.0 15.0 11.5 11.6 10.0 12.2b
T93K-129-4 14.5 11.6 14.0 15.5 12.4 13.4 11.6 13.2ab
IT86D-719 15.5 14.2 12.0 16.5 12.7 13.4 12.0 13.1ab
IT94K-410-2 17.1 x) 14.1 18.1 14.0 15.5 13.6 14.2ab
IT95K-1455 16.0 16.5 11.0 15.2 16.4 16.7 14.0 14.0ab
IT90K-503-1 13.9 x) 14.0 16.4 13.5 10.3 10.3 12.3b
Location meany) 15.2ab 12.6b 14.1ab 16.3a 15.0ab 14.3ab 13.0ab 11.03

z)Means of varieties which are designated by the same letters are not significantly different according to DMRT at the 0.05 probability level.

y)Location means which are designated by the same letters are not significantly different according to DMRT at the 0.05 probability level.

x)Missing value because of unavailable data due to unforeseen circumstances during the trial in these locations.

Table 9
Means and estimates of stability parameters for grain size (g/100 seeds) of some early maturing cowpea varieties tested in different agro-ecologies in Nigeria.
Table 9
Genotypes Parametersz)

Mean bi Sd2i R-square CVi Wi
IT93K-452-1 15.2 0.596 0.176 0.388 18.0 176.74
IT95K-1543 16.1 0.444 −0.565 0.385 12.6 152.53
IT93K-273-2-1 12.2 0.698 −0.637 0.627 20.6 93.24
IT93K-129-4 13.2 0.537 −0.826 0.559 15.5 108.08
IT86D-719 13.1 0.842 −0.224 0.624 23.1 110.48
IT94K-410-2 14.2 1.858 −1.115 0.964 39.0 197.42
IT95K-1455 14.0 1.444 1.716 0.661 27.4 310.00
IT90K-503-1 12.3 1.726 −0.797 0.929 42.0 172.59
Grand mean 11.03 0.905 −0.252 0.571 22.02 146.79

z)bi, Sd2i, CVi, and Wi stand for regression coefficient, deviation from regression, coefficient of variability, and Wricke’s ecovalence, respectively.

Table 10
Correlation coefficients between mean grain yield and stability parameters for early maturing cowpea varieties evaluated in Nigeria.
Table 10
Parametersz) Yield bi Sd2i CVi Wi R-square
Yield 1.000 0.862** −0.738* −0.593 −0.709* 0.889**
bi 1.000 −0.500 −0.153 −0.476 0.761*
Sd2i 1.000 0.653 0.977** −0.863**
CVi 1.000 0.603 −0.401
Wi 1.000 −0.879**
R-Square 1.000

z)bi, Sd2i, CVi, and Wi stand for regression coefficient, deviation from regression, coefficient of variability, and Wricke’s ecovalence, respectively.

* and **Stand for significant at the 0.05 and 0.01 probability level, respectively.

Table 11
Correlation coefficients between days to pod maturity and stability parameters in early maturing cowpea varieties evaluated in Nigeria.
Table 11
Parametersz) Days to Maturity (DM) bi CVi Wi R-square
DM 1.000 0.943* −0.957** −0.946** −0.566
bi 1.000 0.996** 0.925** 0.657
CVi 1.000 0.951** 0.606
Wi 1.000 0.395
R-Square 1.000

z)bi, Sd2i, CVi, and Wi stand for regression coefficient, deviation from regression, coefficient of variability, and Wricke’s ecovalence, respectively.

Table 12
Correlation coefficients between grain size and stability parameters in early maturing cowpea varieties evaluated in Nigeria.
Table 12
Parametersz) Grain size (GS) bi Sd2i CVi Wi R-Square
GS 1.000 −0.309 0.174 −0.393 0.288 −0.566
bi 1.000 0.034 0.983* 0.566 0.916**
Sd2i 1.000 0.131 0.285 −0.380
CVi 1.000 0.476 0.891**
Wi 1.000 0.380
R-square 1.000

z)bi, Sd2i, CVi, and Wi stand for regression coefficient, deviation from regression, coefficient of variability, and Wricke’s ecovalence, respectively.

**Stand for significant at the 0.01 probability level.

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Phenotypic Stability for Selected Traits of Some Cowpea Lines in Nigerian Agro-ecologies
Plant Breed. Biotech.. 2017;5(2):67-77.   Published online June 1, 2017
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Phenotypic Stability for Selected Traits of Some Cowpea Lines in Nigerian Agro-ecologies
Plant Breed. Biotech.. 2017;5(2):67-77.   Published online June 1, 2017
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Phenotypic Stability for Selected Traits of Some Cowpea Lines in Nigerian Agro-ecologies
Phenotypic Stability for Selected Traits of Some Cowpea Lines in Nigerian Agro-ecologies

List of cowpea varieties evaluated in the early maturing multi-environment trial in 1996 and 1997 rainy season, Nigeria.

Genotypes Development Institute Description
IT93K-452-1 IITA, Kano Station Semi-erect, early, white grain, black eye
IT95K-1543 IITA, Kano Station Semi-erect, early, brown grain
IT93K-273-2-1 IITA, Kano Station Semi-erect, early
IT93K-129-4 IITA, Kano Station Erect, early
IT86D-719 IITA, Kano Station Check, erect, early, white grain, brown eye
IT934K-410-2 IITA, Kano Station Semi-erect, early
IT95K-1455 IITA, Kano Station Erect, early, white grain
IT90K-503-1 IITA, Kano Station Semi-erect, early, white grain

Agro-ecological description of test locations used in the evaluation of early maturing cowpea varieties for adaptation in Nigeria.

Description Locations

Abeokuta Ile-Ife Bauchi Gombe Kano1 Kano2 Mokwa Samaru1 Samru2 Ibadan Uyo
Coordinate 7° 10′N: 3° 20′E 7° 28″ N; 4° 33″ E 10° 18″ N; 9° 50″ E 10° 16″ N; 11° 10″ E 12° 01″ N; 8° 30″ E 12° 01″ N; 8° 30″ E 9°17″ N; 5° 03″E 11°11″N 07° 38″ E 11°11″N 07° 38″ E 7° 21′N; 3° 50′E 4° 58′N; 7° 55′E
Soil type Alfisols Alfisols Alfisols Alfisols Inceptisols Inceptisols Alfisols Ultisols Ultisols Alfisols Ultisols
Growing days 180 180 150 120 90 90 190 150 150 180 270
Annual rainfall (mm) 1195.4 1195 1101 981 800 800 1050 1011 1011 1278 > 2500
Agro-ecology Forest cum derived savanna Forest Northern Guinea savanna Sudan savanna Sudan savanna Sudan savanna Southern Guinea savanna Northern Guinea savanna Northern Guinea savanna Forest Forest

Mean squares for grain yield, days to pod maturity and seed size for early maturing cowpea varieties tested for two years and in different locations in Nigeria.

Source Degrees of Freedom Mean Square

Grain yield Maturity Seed size
Genotypes 7 379755.2** 710.097** 52.272**
Location 9 359927.0** 4040.771** 190.315**
Genotype × Location 63 264594.6** 389.565** 22.344**

**Stand for significant at the 0.01 probability level.

Grain yield (t/ha) of some early maturing varieties tested in a multi-environment evaluation in Nigeria.

Genotypes Locations

Abeokuta Bauchi Gombe Ile-Ife Kano 1 Kano 2 Mokwa Samaru1 Samaru2 Ibadan Uyo Meanz)
IT93K-452-1 0.67 1.40 1.77 0.69 1.09 1.07 1.19 0.47 0.47 1.43 0.87 0.89a
IT95K-1543 0.56 1.60 1.72 0.49 1.36 1.02 0.92 0.35 0.27 1.74 0.50 0.87ab
IT93K-273-2-1 0.53 1.32 1.48 0.82 1.43 0.65 0.82 0.42 0.35 1.35 0.64 0.82ab
IT93K-129-4 0.73 1.16 2.06 0.76 1.01 0.46 0.85 0.30 0.19 1.26 1.03 0.80ab
IT86D-719 0.51 1.45 1.69 0.34 0.84 1.54 0.77 0.48 0.46 1.18 1.06 0.73bc
IT94K-410-2 0.69 1.21 x) 0.67 1.38 0.39 0.77 0.51 0.38 1.23 0.54 0.66dc
IT95K-1455 0.82 1.32 1.40 0.76 1.00 0.13 0.96 0.34 0.34 x) 0.56 0.63cd
IT90K-503-1 0.59 1.17 2.06 0.41 0.49 0.52 0.99 0.44 0.52 1.40 0.49 0.59d
Location meany) 0.64ef 1.33b 1.73a 0.62ef 1.08c 0.55fg 0.91d 0.41g 0.37g 1.40b 0.71de 0.86

z)Means of varieties which are designated by the same letters are not significantly different according to DMRT at the 0.05 probability level.

y)Location means which are designated by the same letters are not significantly different according to DMRT at the 0.05 probability level.

x)Missing value because of unavailable data due to unforeseen circumstances during the trial in these locations.

Means and estimates of stability parameters for grain yield (t/ha) of some early maturing cowpea varieties tested in different agro-ecologies in Nigeria.

Genotypes Parametersz)

Mean bi Sd2i R-square CVi Wi
IT93K-452-1 0.89 1.016 10347.64 0.826 50.3 1600433.68
IT95K-1543 0.87 1.203 −2080.29 0.766 63.3 3519134.53
IT93K-273-2-1 0.82 1.045 8408.89 0.801 56.9 1993556.29
IT93K-129-4 0.80 1.115 −10928.64 0.860 59.5 3245170.67
IT86D-719 0.73 0.929 −2128.57 0.662 62.1 3245170.67
IT94K-410-2 0.66 0.930 1764.66 0.519 62.2 3771486.70
IT95K-1455 0.63 0.881 −2128.12 0.616 67.2 3068034.64
IT90K-503-1 0.59 0.600 1893.7 0.309 60.5 4504546.79
Grand Mean 0.75 0.858 572.14 0.595 53.56 2771948.22

z)bi, Sd2i, CVi, and Wi stand for regression coefficient, deviation from regression, coefficient of variability, and Wricke’s ecovalence, respectively.

Days taken to 90% pod maturity for early maturing cowpea varieties tested in a multi-environment evaluation in Nigeria.

Genotypes Locations

Abeokuta Bauchi Ile-Ife Kano 1 Kano 2 Mokwa Samaru1 Samaru 2 Ibadan Uyo Meanz)
IT93K-452-1 75.3 57.6 70.0 62.6 68.0 76.0 81.6 76.6 65.0 68.0 71.0ab
IT95K-1543 77.0 62.0 69.0 75.1 72.0 76.0 86.0 79.0 63.0 68.0 74.7a
IT93K-273-2-1 77.8 66.0 70.0 65.3 70.0 75.6 83.1 76.6 65.0 68.0 73.0ab
IT93K-129-4 76.5 63.0 68.6 70.3 74.3 77.0 81.3 78.0 65.5 68.0 73.3ab
IT86D-719 75.3 59.3 68.6 68.6 69.3 76.6 85.5 83.3 66.5 68.0 73.3ab
IT94K-410-2 75.8 65 69.3 65.0 70.0 74.0 82.0 80.0 64.0 68.0 67.4bc
IT95K-1455 75.3 67 68.0 70.0 72.0 75.0 84.5 80.3 68.0 68.0 64.7c
IT90K-503-1 66.6 61 68.6 52.3 50.0 77.0 81.5 80.3 66.5 75.0 62.8c
Location meany) 75.0bc 62.6e 69.0cd 66.1d 68.2d 76.0bc 83.2a 79.2ab 65.4d 69.0dc 71.3

z)Means of varieties which are designated by the same letters are not significantly different according to DMRT at the 0.05 probability level.

y)Location means which are designated by the same letters are not significantly different according to DMRT at the 0.05 probability level.

Means and estimates of stability parameters for days to pod maturity of some early maturing cowpea varieties tested in different agro-ecologies in Nigeria.

Genotypes Parametersz)

Mean bi R-square CVi Wi
IT93K-452-1 71 0.585 0.780 11.0 1333.78
IT95K-1543 75 0.534 0.635 10.5 1890.61
IT93K-273-2-1 73 0.444 0.546 9.7 2348.50
IT93K-129-4 73 0.431 0.699 8.2 2005.36
IT86D-719 73 0.621 0.804 11.1 1177.45
IT94K-410-2 67 1.692 0.866 32.8 4514.99
IT95K-1455 65 1.933 0.839 39.7 7770.41
IT90K-503-1 63 1.803 0.760 38.5 8279.27
Grand mean 70 1.005 0.741 20.2 3665

z)bi, Sd2i, CVi, and Wi stand for regression coefficient, deviation from regression, coefficient of variability, and Wricke’s ecovalence, respectively.

Grain size (g/100 seeds) for early maturing cowpea varieties tested in multi-environment evaluation in Nigeria.

Genotypes Locations

Abeokuta Bauchi Ile-Ife Mokwa Samaru1 Samaru 2 Uyo Meanz)
IT93K-452-1 15.4 12.0 19.3 16.5 16.0 16.6 15.3 15.2ab
IT95K-1543 15.0 12.5 15.3 17.6 18.3 18.4 15.0 16.1a
IT93K-273-2-1 14.1 9.0 12.0 15.0 11.5 11.6 10.0 12.2b
T93K-129-4 14.5 11.6 14.0 15.5 12.4 13.4 11.6 13.2ab
IT86D-719 15.5 14.2 12.0 16.5 12.7 13.4 12.0 13.1ab
IT94K-410-2 17.1 x) 14.1 18.1 14.0 15.5 13.6 14.2ab
IT95K-1455 16.0 16.5 11.0 15.2 16.4 16.7 14.0 14.0ab
IT90K-503-1 13.9 x) 14.0 16.4 13.5 10.3 10.3 12.3b
Location meany) 15.2ab 12.6b 14.1ab 16.3a 15.0ab 14.3ab 13.0ab 11.03

z)Means of varieties which are designated by the same letters are not significantly different according to DMRT at the 0.05 probability level.

y)Location means which are designated by the same letters are not significantly different according to DMRT at the 0.05 probability level.

x)Missing value because of unavailable data due to unforeseen circumstances during the trial in these locations.

Means and estimates of stability parameters for grain size (g/100 seeds) of some early maturing cowpea varieties tested in different agro-ecologies in Nigeria.

Genotypes Parametersz)

Mean bi Sd2i R-square CVi Wi
IT93K-452-1 15.2 0.596 0.176 0.388 18.0 176.74
IT95K-1543 16.1 0.444 −0.565 0.385 12.6 152.53
IT93K-273-2-1 12.2 0.698 −0.637 0.627 20.6 93.24
IT93K-129-4 13.2 0.537 −0.826 0.559 15.5 108.08
IT86D-719 13.1 0.842 −0.224 0.624 23.1 110.48
IT94K-410-2 14.2 1.858 −1.115 0.964 39.0 197.42
IT95K-1455 14.0 1.444 1.716 0.661 27.4 310.00
IT90K-503-1 12.3 1.726 −0.797 0.929 42.0 172.59
Grand mean 11.03 0.905 −0.252 0.571 22.02 146.79

z)bi, Sd2i, CVi, and Wi stand for regression coefficient, deviation from regression, coefficient of variability, and Wricke’s ecovalence, respectively.

Correlation coefficients between mean grain yield and stability parameters for early maturing cowpea varieties evaluated in Nigeria.

Parametersz) Yield bi Sd2i CVi Wi R-square
Yield 1.000 0.862** −0.738* −0.593 −0.709* 0.889**
bi 1.000 −0.500 −0.153 −0.476 0.761*
Sd2i 1.000 0.653 0.977** −0.863**
CVi 1.000 0.603 −0.401
Wi 1.000 −0.879**
R-Square 1.000

z)bi, Sd2i, CVi, and Wi stand for regression coefficient, deviation from regression, coefficient of variability, and Wricke’s ecovalence, respectively.

* and **Stand for significant at the 0.05 and 0.01 probability level, respectively.

Correlation coefficients between days to pod maturity and stability parameters in early maturing cowpea varieties evaluated in Nigeria.

Parametersz) Days to Maturity (DM) bi CVi Wi R-square
DM 1.000 0.943* −0.957** −0.946** −0.566
bi 1.000 0.996** 0.925** 0.657
CVi 1.000 0.951** 0.606
Wi 1.000 0.395
R-Square 1.000

z)bi, Sd2i, CVi, and Wi stand for regression coefficient, deviation from regression, coefficient of variability, and Wricke’s ecovalence, respectively.

Correlation coefficients between grain size and stability parameters in early maturing cowpea varieties evaluated in Nigeria.

Parametersz) Grain size (GS) bi Sd2i CVi Wi R-Square
GS 1.000 −0.309 0.174 −0.393 0.288 −0.566
bi 1.000 0.034 0.983* 0.566 0.916**
Sd2i 1.000 0.131 0.285 −0.380
CVi 1.000 0.476 0.891**
Wi 1.000 0.380
R-square 1.000

z)bi, Sd2i, CVi, and Wi stand for regression coefficient, deviation from regression, coefficient of variability, and Wricke’s ecovalence, respectively.

**Stand for significant at the 0.01 probability level.

Table 1 List of cowpea varieties evaluated in the early maturing multi-environment trial in 1996 and 1997 rainy season, Nigeria.
Table 2 Agro-ecological description of test locations used in the evaluation of early maturing cowpea varieties for adaptation in Nigeria.
Table 3 Mean squares for grain yield, days to pod maturity and seed size for early maturing cowpea varieties tested for two years and in different locations in Nigeria.

Stand for significant at the 0.01 probability level.

Table 4 Grain yield (t/ha) of some early maturing varieties tested in a multi-environment evaluation in Nigeria.

Means of varieties which are designated by the same letters are not significantly different according to DMRT at the 0.05 probability level.

Location means which are designated by the same letters are not significantly different according to DMRT at the 0.05 probability level.

Missing value because of unavailable data due to unforeseen circumstances during the trial in these locations.

Table 5 Means and estimates of stability parameters for grain yield (t/ha) of some early maturing cowpea varieties tested in different agro-ecologies in Nigeria.

bi, Sd2i, CVi, and Wi stand for regression coefficient, deviation from regression, coefficient of variability, and Wricke’s ecovalence, respectively.

Table 6 Days taken to 90% pod maturity for early maturing cowpea varieties tested in a multi-environment evaluation in Nigeria.

Means of varieties which are designated by the same letters are not significantly different according to DMRT at the 0.05 probability level.

Location means which are designated by the same letters are not significantly different according to DMRT at the 0.05 probability level.

Table 7 Means and estimates of stability parameters for days to pod maturity of some early maturing cowpea varieties tested in different agro-ecologies in Nigeria.

bi, Sd2i, CVi, and Wi stand for regression coefficient, deviation from regression, coefficient of variability, and Wricke’s ecovalence, respectively.

Table 8 Grain size (g/100 seeds) for early maturing cowpea varieties tested in multi-environment evaluation in Nigeria.

Means of varieties which are designated by the same letters are not significantly different according to DMRT at the 0.05 probability level.

Location means which are designated by the same letters are not significantly different according to DMRT at the 0.05 probability level.

Missing value because of unavailable data due to unforeseen circumstances during the trial in these locations.

Table 9 Means and estimates of stability parameters for grain size (g/100 seeds) of some early maturing cowpea varieties tested in different agro-ecologies in Nigeria.

bi, Sd2i, CVi, and Wi stand for regression coefficient, deviation from regression, coefficient of variability, and Wricke’s ecovalence, respectively.

Table 10 Correlation coefficients between mean grain yield and stability parameters for early maturing cowpea varieties evaluated in Nigeria.

bi, Sd2i, CVi, and Wi stand for regression coefficient, deviation from regression, coefficient of variability, and Wricke’s ecovalence, respectively.

Stand for significant at the 0.05 and 0.01 probability level, respectively.

Table 11 Correlation coefficients between days to pod maturity and stability parameters in early maturing cowpea varieties evaluated in Nigeria.

bi, Sd2i, CVi, and Wi stand for regression coefficient, deviation from regression, coefficient of variability, and Wricke’s ecovalence, respectively.

Table 12 Correlation coefficients between grain size and stability parameters in early maturing cowpea varieties evaluated in Nigeria.

bi, Sd2i, CVi, and Wi stand for regression coefficient, deviation from regression, coefficient of variability, and Wricke’s ecovalence, respectively.

Stand for significant at the 0.01 probability level.