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Review Article

Phenotyping of Plants for Drought and Salt Tolerance Using Infra-Red Thermography

Taek-ryoun Kwon1,*, Kyung-hwan Kim1, Hae-Jin Yoon1, Seung-kon Lee1, Beom-ki Kim1, Zamin Shaheed Siddiqui2
Plant Breeding and Biotechnology 2015;3(4):299-307.
Published online: November 30, 2015

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*Corresponding author: Taek-ryoun Kwon, trkwon@Korea.kr, Tel: +82-63-238-4661, Fax: +82-63-238-4654
• Received: October 7, 2015   • Revised: November 17, 2015   • Accepted: November 19, 2015

Copyright © 2015 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/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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  • Drought and salinity are the major environmental constrains in global agricultural production. Plant breeding for the drought and salt tolerance needs a proper assessment procedure to overcome stress constrain. Fundamental understanding on the physiological nature of the plant tolerance provides valuable information for the genetically modified crop’s development. Drought or salt stress induces several common physiological responses in plants such as water relation and photosynthetic capacitiy. It is because both stresses lead cellular dehydration in the plants, particularly, during the early phase of stress imposition. Drought and salinity decrease CO2 availability for photosynthesis via stomatal limitation as well as elevate leaf temperature due to partially closed stomata. In this scenario, stomatal regulation and plant water status are important aspects in abiotic stress environment. These physiological responses have a function to stabilize the temperature inside plant/leaf. Therefore phenotyping through an infra-red thermography (heat sensitive sensor), could be a useful tool in the selection of a tolerant genotypes. Infra-red thermography is a part of the electromagnetic spectrum which emits a certain amount of radiation as a function of their temperatures. In general, the plants which have less water, would have higher temperature and display more infra-red radiations. In abiotic stresses such as drought and salinity, plant water status is affected and varied from the sensitive to tolerant level. Infra-red images of plants are often linked with some of the physiological attributes to the tolerance. This review covers the limits, advantages, linkages, comparison and other prospectives of using thermal imagaes in modern phenotyping techniques.
  • Key words: Drought, Infra-red thermography, Phenomics, Physiological traits, Salinity
It is largely known that drought and salinity are main environmental constrains confronting global agricultural production. These two adverse environmental stresses affect over more than 10 percent arable land in the world (Bray et al. 2000). Drought and salinity cause detrimental decline of agricultural productivity causing more than 50 % reduction of regular yield in globally important crops. Thus, the improvement of drought and salt tolerance in crop plants is an important goal for crop breeding.
Fundamental understanding on the nature of the tolerance is prerequisite step in the development of crop plants for drought and salt tolerances. Plant tolerance against these stresses can be obtained from stacking multiple physiological traits and several metabolic processes in the presence of adverse drought and salinity consequences, leading challenges to determine the fundamental process attributing for the tolerance (Flowers 2004).
Drought or salt stress prompts several common responses in plants such as relative water content, osmotic potential, quantum yield efficiency etc (Munns 2002; Bartels and Sunkar 2005; Chaves et al. 2009). Both stresses lead cellular dehydration in the plants, particularly, during the early phase of stress imposition which results in osmotic imbalance and movement of cytoplasmic water into apoplatic space. Further changes in metabolic processes, decreasing photosynthesis activity and rising plant hormone like absicic acid were also common in plants when subject to drought and salt stresses (Siddiqui et al. 2014a).
Plants adapt to adversity of drought and salinity by several physiological adjustment such as osmotic adjustment, water and photosynthetic control, oxidative protection, molecular signaling and gene regulation (Silveira et al. 2012). However, some adaptive responses of plants to those stresses are stress-dependent. For instance, salt tolerance in plants operates specific mechanisms such as ionic homeostasis, nutritional balance, ion-specific signaling and gene expression. For drought tolerance, plants triggers specific signaling and gene expression to drought condition.
In photosynthesis, quantum efficiency of photosystem II is a primary physiological response to abiotic stress (Chaves 1991; Munns et al. 2006; Siddiqui et al. 2014b). These stresses decrease CO2 availability for photosynthesis via stomatal limitation (Flexas et al. 2007) and photosynthetic efficiency (Lawlor and Cornic 2002) via non-stomatal limitation. Plants also have complex processes of photosynthesis under drought and salt stresses (Chaves et al. 2009). Photosynthetic activities of stress-imposed plants depend on positions of leaves and stages of plant development. Moreover, the intensity and duration of the stresses influence the photosynthetic activity of plants.
Hence, it is important to understand the physiological mechanisms of tolerance regarding stress at whole plant level (Munns 1993). In saline environment, salt-induced reduction of plant growth is predominantly caused by osmotic stress at first short-term stress conditions (Munns et al. 2002), which is a similar response caused by drought. After the first phase, the second phase reduction of plant growth is predominantly occured by ion toxicity, which appears due to excessive toxic ion accumulation especially in the mature leaves, causing premature senescence and less photosynthetic ability. Plant tolerance against the stresses at whole plant level can be defined as maintaining ability of growth and metabolic process under the adverse stress conditions (Munns and Tester 2008).
There were considerable improvements for salt tolerance in crop plants such as rice, barley, maize, pear millet and so on, mainly through visual assessments of stressed plants in breeding program (Ashraf and Wu 1994). However, the physiological / biochemical mechanism underlying the phenotypic tolerance was not clear especially in the consideration as selection criteria. Thus special efforts have been made to develop reliable physiological / biochemical parameters for assessing the drought and salt tolerances.
Recently, high-throughput phenotyping approaches based on the parameters of the tolerance-related physiology and biochemistry have been emerged as a powerful methodology for the screening of drought and salt tolerances. A new approach comes from a theoretical background of ‘Phenomics’, which can be defined roughly as assessment of physiological and biochemical traits with camera’s images taken at various light spectrums including RGB (Red, Green and Blue), infra-red, near infra-red, hyper-spectral spectrum and chlorophyll fluorescence (Lee et al. 2011). Honsdorf et al. (2014) successfully applied a high-throughput phenotyping to identify drought tolerance in wild barley introgression lines. Likewise, other scientists expanded the application of Infra-red thermography as a high-throughput phenotyping tool to field, indicating a possible screening for not only abiotic-stress tolerance but also biotic-stress tolerance (Prashar and Jones 2014). This review focuses on a screening of drought and salt tolerance of plants using infra-red thermography together with a few physiological traits. Bioassay of transgenic plant against drought stress in the field is always a problematic in particular. In this situation, bioassay of transgenic plant with infra-red camera can be useful tool to select drought tolerant genotypes in less time with key physiological traits.
Principles of infra-red (IR) thermography to evaluate salt and drought tolerances
High-throughput phenotyping through an infra-red thermography (heat sensitive sensor) is based on the heat produced in stressed plant (Munns et al. 2010). Working with IR, it is possible to follow the progress of stressed plant over time quantitatively through combination of careful image capture, image analysis and color classification. In assessment of stressed plants, IR thermal sensing can provide rapid, vast and effective phenotyping but it has to be adopted certain principles. For instance, infra-red thermography is a part of the electromagnetic spectrum which emits a certain amount of radiation as a function of their temperatures.
Generally, plants would display higher temperature when they have less water; the more infra-red radiation is emitted. A special camera like IR can detect this radiation in a way similar to the way an ordinary camera detects visible light. It works well in total darkness because ambient light level does not matter. Infra-red thermal images tend to have a single color channel because the camera commonly uses an image sensor that does not differentiate wavelengths of infra-red radiation.
For use in temperature measurement, the brightest (warmest) parts of the images are typically colored white, intermediate temperatures reds and yellows, and the dimmest (coolest) parts black. It is totally dependent on the adjustment of colour scheme. A scale should be shown next to a false color image to relevant colors to a certain temperature. Their resolution is considerably lower than that of optical cameras, mostly in between 160×120 or 320×240 pixels, although some advanced cameras can also achieve a better resolution of 1280×1024 pixels. In un-cooled detectors, the temperature differences at the sensor pixels are 1 °C. The pixel response time is also fairly slow, at the range of tens of milliseconds. Camera sensitivity is as fine as <0.02°C for outstanding image quality and thermal patterns. Temperature range calibration of IR camera is up to 2,000°C for measuring the hottest objectives.
IR camera usually allows sensing of early heat generation in stressed plant or plant organ, especially, leaf. In abiotic stresses such as drought and salinity, plant water status is affected and varied from the sensitive to tolerant level (Fig. 1). It was proved that cool parts of the stress tolerant plant indicate less heat compared to warm parts. Water status of leaf is reflected heat generation that can be detected and distinguished by IR camera using software under controlled environment. Stress-induced heat generation could be expressed as pattern of colour and average plant / leaf temperature. Stress sensitive wild-type plant showed less blue appearance compared to did stress tolerant transgenic plants. Similarly, root images of salt treated plant appeared as less blue as the concentration of the salt increased.
Plants with same genetic background may have different phenotypes, depending on the growing habitat. In last few decades, conventional screening based on visual assessment and physiological trait analysis has been declined due to hard, time consuming and destructive nature. However, latest development of high-throughput imaging systems and their computation allow modern, fast and non-destructive phenotyping in plant research. High-throughput phenotyping techniques using IR thermography can not only be useful to save time for screening of tolerance but also provide better coverage and non-destructive in nature. Modern technology in phenomics research accelerates the process for selecting plant genotypes that perform better in the drought or salt affected field. Multiple physiological traits like stomatal conductance, osmotic potential, dark-adapted quantum yield (Fv/Fm ratio) and biomass allocation were frequently used in low-throughput phenotyping for the selection of tolerant traits (Davies et al. 2005; Burke et al. 2006; Siddiqui et al. 2008; Munns et al. 2010; Richards et al. 2010; Siddiqui 2013).
Phenotyping of transgenic plants for drought tolerance with IR images
Drought is a main constraint among the abiotic stresses that occur in rain fed region. Climate extreme such as drought continues to hinder the ecosystem and agriculture of the region. Plant species have adapted to enhance their ability to tolerate abiotic stress through physiological adjustments (Siddiqui et al. 2014b).
Many research articles have forwarded to elucidate the response mechanisms of the plant against stress and their tolerance. Many transgenic plants have been developed to show drought resistance using modern biotechnology (Sharma and Gills 1994; Kumar and Kumar 1996; Shinozaki and Yamaguchi-Shinozaki 2000; Munns 2002; Siddiqui 2013; Siddiqui et al. 2014b). Bioassay of transgenic plant against drought stress in the field is always a problematic in particular because of complexity of environments and multiple traits. In this situation, bioassay of transgenic plant with IR camera can be a useful tool to find out drought tolerant genotypes in less time with substantial coverage. Foremost, IR thermography works on heat production and measure as temperature difference among the tested plants. IR thermograpies of plants are often linked with some of the physiological attributes to the tolerance. For instance, in a study of CaMsrB2 transgenic rice plant, thermal images of drought-tolerant transgenic genotypes and their wild types showed substantial difference in their thermal images (Fig. 2). The transgenic lines with drought tolerant gene had lower plant and leaf temperatures as compared to that of their wild-type plants.
Siddiqui et al. (2014) observed that in drought stress, CaMsrB2 expressing transgenic rice genotypes differed from its wild-type geneotypes in average plant temperature. The stress-induced changes of plant temperature have a significant relationship with the physiological traits of plants such as osmotic potential, RWC and stomatal conductance (Table 1). Significant negative correlations were found between average plant temperature and RWC (r=−0.905).
It was reported that forward-looking infra-red (IR) thermal images of stressed plants showed considerable differences in leaf temperatures of both transgenic lines as compared to the wild type under the drought stress (Siddiqui et al. 2014b). In a drought environment, leaf temperature of plant is an immediate indicator of internal water status. IR thermal sensing of drought imposed plants provided immediate indication for responses of plant against drought (Munns 2002; Sirault et al. 2009). There-fore, phenotyping using a IR thermography recognizes drought-tolerant plants traits with greater efficiency. In sensitive genotypes, temperatures of leaf and plant body increased in water-deficit environments. In drought-tolerant plants, stomata plays a key role to maintain enough moisture inside the leaf and lower temperatures under water deficit condition (Munns 2002; Jones et al. 2009), as was seen in CaMsrB2 transgenic lines. Therefore RWC and stomatal conductance were found to be consistent with IR thermography under drought stress. There were successful cases applying IR thermography to screen drought tolerant genotypes in wheat breeding (Fischer et al. 1998; Reynolds et al. 1998; Brennan et al. 2007).
Phenotyping of transgenic plants for salt tolerance with IR images
Conventional assessment of salt-tolerant physiological traits is time consuming, laborious, and mostly destructive. For the selection of the salt-tolerant plants, both conventional low-throughput physiological approaches and modern high-throughput phenotyping approaches have been used. Scientists need to correlate these two approaches and to homogenize the protocol for examining adequate phenotypes under salt stress that might have some role in the regulation of plant temperature (Merlot et al. 2002; Jones et al. 2009; Collins et al. 2010; Munns et al. 2010). Stomatal regulation and plant water status are important aspects in the presence of salt stress. These physiological responses have a function to stabilize the temperatures of plant/leaf. That could be examined by infra-red thermography (Table 2).
Siddiqui et al. (2014b) found that Cvs. ’Donjin’ and ‘Ilmi’ vaired in expression of IR thermography with the increment of salt stress. As salinity incresed, plants changed from blue color to green, then yellow and red. Salinity- induced changes of IR thermography were significantly correlated with relative water content (RWC) of the plants. Physiological parameter such as stomatal conductance, which are open being used for plant’s tolerance assessment, was also correlated well with average IR thermograpy pattern (Siddiqui 2013). However, photosynthetic performance index and dark-adapted quantum yield were not significantly correlated with the results obtained by IR thermography. However, many studies have used Fv/Fm ratio as an indicator for stress tolerance or sensitivity (Penuelas and Boada 2003). The reason behind this may be that IR sensing is based on heat generation of plant which is linked with water status rather than photosynthetic efficiency. Any variation in leaf temperature due to heat production can be detected by IR thermography. Obtaining IR thermography on plants should be taken under a controlled environment. It was reported that surrounding environment of the target plants would affect the IR thermography (Siddiqui et al. 2014a). Stomatal conductance, relative water content and dark-adapted quantum yield of plants are affected by salt stress and some of these physiological attributes are linked with the leaf temperature (Munns et al. 2010). Commonly, water loss from leaf needs a considerable amount of energy to convert each molecule of water from liquid to vapor. This energy is then taken away from the leaf in the evaporating water for cooling purpose (Jones et al. 2009). Thus, for a given environmental or stress condition, leaf transpiration is an important determinant of leaf temperature. In the case of stress caused by either salt or drought, an immediate plant response is a reduction in transpiration of leaves to reduce water loss, resulting in an increase in the leaf temperature (Woo et al. 2008; Munns et al. 2010). Moreover, Garrity and O’Toole (1994) have postulated that IR thermography could be used to determine leaf and canopy temperature as an indirect estimation of plant water status. Relationship between physiological parameters and IR images is based on the type and nature of stress and genotypes. For instance, tolerant genotypes uptake soil water efficiently by maintaining higher stomatal conductance and therefore can show cooler leaves (Jones et al. 2009; Berger et al. 2010; Lu et al. 2011). Further, Sirault et al. (2009) proposed that leaf temperature could be an indicator of stomatal conductance. Leaf temperature increased along with the increment of salinity. The ranking of the genotypes based on the growth and thermal IR measurements was consistent (Sirault et al. 2009; Munns et al. 2010).
Moreover, water status in a plant is highly sensitive to salinity and therefore it is dominant in determining plant responses to stress (Stepien and Klobus 2006). Dark-adapted quantum yield responses to salt stress environment is rather slow and can be detectable in a large tray experiment using very small seedlings (Woo et al. 2008; Jansen et al. 2009). Since some experiments were carried out using small trays, dark-adapted quantum yield might not produce significant changes in leaf temperature and thus it could not be detected by IR thermal images sensing. Therefore, based on the working principels of the IR camera, IR thermo-graphy may not be related to the photosynthetic performance of a plant under salinity. Meanwhile, plant temperature allows the indication of the degree of stress in a plant with clear relationship with relative water content and stomatal conductance. Under salt stress environment, plant temperature and water status are perhaps linked to soil water availability, leaf water potential, and stomatal conductance. IR thermography was proved to be related to soil- and plant-based measures of water stress. It was also observed that IR thermography can be potentially used for identifying the differences among various genotypes in variable plant irrigation and stress environment (Romano et al. 2011; Zia et al. 2011). However, sophisticated technology in the field needs to be developed in order to identify the best protocol to optimize the data accuracy. Correlation analysis between conventional low-throughtput and modern high-throughput phenotyping showed that stress-induced changes of plant or leaf temperature could be a useful tool to screen genotypes for target tolerance. A modern IR thermography techniques may offer less time consuming, non-destructive and mass bioassay for phenotyping of plant’s salt tolerance.
Drought and salinity are greater challenges that cut off agricultural production substantially all over the world. Crop breeding for drought and salt tolerance is economically realistic measure to tackle the global challenges stemming from the unfavorable environmental constrain in the agricultural productivity. In fact, first step towards development of a practical stress-tolerant crop plant is to understand the fundamental mechanism working for the tolerance, which are based on the physiological and biochemical traits. Conventional plant breeding and modern biotechnologies have been applied to explore the tolerances of drought and salinity so far. However, a great challenge in the exploration of the stress-tolerant genotypes was to link between target genes, functioning for the tolerance, and relevant phenotypes, especially, at whole plant level.
So far many scientific works for the drought and salt tolerance adopted a destructive time-consuming approach to dig out the mechanism. So it was difficult to apply in the practical approaches to develop the tolerant genotypes, especially, in the agricultural field. Recently, converging various modern technologies like infra-red thermography, automated robotics, camera images, computational algorisms and biotechnologies creates unique approaches to help in the assessment of drought and salt tolerances in crop plants, providing with non-destructive mass measurements of certain physiological traits working for the tolerance. This review enlightened possible application of infra-red thermography as a tool to measure the drought and salt tolerances in plants along with stress-tolerant transgenic plants. A few reported cases of transgenic rice plants evaluation revealed that the infra-red thermography of the stressed plant successfully distinguished the difference between the tolerant lines and sensitive lines with great correlation with physiological traits like relative water content and stomatal conductance (Fig. 3). Tolerant genotypes showed cool infra-red thermal images of lower temperature with greater stomatal conductance and relative water contents in the presence of the stresses as compared with those of sensitive plants. Thus, it is suggested that high-throughput phenotyping with infra-red thermography can not only be a practical mass non-destructive measurement of drought and salt tolerance in plants but also be applied in the assessment of stress tolerant plants in a larger field area.
This work was supported by grants from the National Institute of Agricultural Science (PJ01005702) and the National Center for GM Crops, Biogreen 21 program, RDA, Republic of Korea.
Fig. 1
Relationship between IR image’s colour and water status in rice plants, especially, for the phenotyping for drought and salt tolerance. Image A, B, C and D (Siddiqui et al. 2014) E (Kuromori et al. 2011).
pbb-15-299f1.jpg
Fig. 2
IR image of CaMsrB2 transgenic rice plants in drought expressing different leaf temperature as compare to their wild type (Siddiqui et al. 2014b). L-8 and L-23 are transgenic lines with the overexpressed drought tolerant gene, CaMsrB2. WT is their wild type.
pbb-15-299f2.jpg
Fig. 3
Plants have different infra-red thermography depending on which they grown with or without drought/salt stress. The stressed plant has a limited water uptake in the presence of drought and salinity, resulting in less availability of tissue water. This dehydration causes plant to close stomata on leaf, leading an increment of temperature. Infra-red thermography can detect the stress-induced changes of temperature at last.
pbb-15-299f3.jpg
Table 1
Average leaf temperature and their correlation with some physiological traits under drought stress. Seedlings of CaMsrB2 expressing transgenic lines and its wildtype were imposed by drought stress via withholding water prior to measure those physiological traits (Siddiqui et al. 2014). Correlations were calculated between plant tempertature and their physiological data.
Table 1
Genotypes Temperature °C Osmotic Potential (bar) RWC (%) Stomatal Conductance (mmole m−2 s−1)
WT 27.80±0.12 1.2±0.32 40±3.22 8.00±3.22
Line-8 27.27±0.13 3.6±0.33 54±4.33 38.2±4.33
Line-23 27.07±0.12 6.9±0.25 68±6.52 120±17.95
r −0.85 −0.905 −0.704

Similar alphabet on each values represent non-significant at P=0.01) r=Correlation values Camera Model FLIR 620SC, software ThermaCAM.

Table 2
Average leaf temperature, relative water content (RWC) and stomatal conductance of rice plants under various salinity. Seedlings of rice genotypes, cvs. ‘Dongjin’ and ‘Ilmi’, were imposed by several NaCl salinity prior to measure those physiological traits using a protocol mentioned in Siddiqui et al. (2014b). Correlations were calculated between salinity and physiological changes.
Table 2
NaCl mM Temperature °C RWC (%) Stomatal conductance (mmole m−2 s−1)
0 27.9±0.12 75.3±3.22 140±7.55
75 28.5±0.13 70.0±4.33 115±3.15
150 29.4±0.12 52.5±3.95 50.0±2.88
225 30.4±0.15 40.0±2.25 30.0±1.15
r +0.88 −0.85 −0.62

Leaf temperature were measured by ThermaCAM software FLIR SC 620.

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Phenotyping of Plants for Drought and Salt Tolerance Using Infra-Red Thermography
Plant Breed. Biotech.. 2015;3(4):299-307.   Published online November 30, 2015
DOI: https://doi.org/10.9787/PBB.2015.3.4.299
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Phenotyping of Plants for Drought and Salt Tolerance Using Infra-Red Thermography
Plant Breed. Biotech.. 2015;3(4):299-307.   Published online November 30, 2015
DOI: https://doi.org/10.9787/PBB.2015.3.4.299
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Phenotyping of Plants for Drought and Salt Tolerance Using Infra-Red Thermography
Image Image Image
Fig. 1 Relationship between IR image’s colour and water status in rice plants, especially, for the phenotyping for drought and salt tolerance. Image A, B, C and D (Siddiqui et al. 2014) E (Kuromori et al. 2011).
Fig. 2 IR image of CaMsrB2 transgenic rice plants in drought expressing different leaf temperature as compare to their wild type (Siddiqui et al. 2014b). L-8 and L-23 are transgenic lines with the overexpressed drought tolerant gene, CaMsrB2. WT is their wild type.
Fig. 3 Plants have different infra-red thermography depending on which they grown with or without drought/salt stress. The stressed plant has a limited water uptake in the presence of drought and salinity, resulting in less availability of tissue water. This dehydration causes plant to close stomata on leaf, leading an increment of temperature. Infra-red thermography can detect the stress-induced changes of temperature at last.

Fig. 1

Fig. 2

Fig. 3

Phenotyping of Plants for Drought and Salt Tolerance Using Infra-Red Thermography

Average leaf temperature and their correlation with some physiological traits under drought stress. Seedlings of CaMsrB2 expressing transgenic lines and its wildtype were imposed by drought stress via withholding water prior to measure those physiological traits (Siddiqui et al. 2014). Correlations were calculated between plant tempertature and their physiological data.

Genotypes Temperature °C Osmotic Potential (bar) RWC (%) Stomatal Conductance (mmole m−2 s−1)
WT 27.80±0.12 1.2±0.32 40±3.22 8.00±3.22
Line-8 27.27±0.13 3.6±0.33 54±4.33 38.2±4.33
Line-23 27.07±0.12 6.9±0.25 68±6.52 120±17.95
r −0.85 −0.905 −0.704

Similar alphabet on each values represent non-significant at P=0.01) r=Correlation values Camera Model FLIR 620SC, software ThermaCAM.

Average leaf temperature, relative water content (RWC) and stomatal conductance of rice plants under various salinity. Seedlings of rice genotypes, cvs. ‘Dongjin’ and ‘Ilmi’, were imposed by several NaCl salinity prior to measure those physiological traits using a protocol mentioned in Siddiqui et al. (2014b). Correlations were calculated between salinity and physiological changes.

NaCl mM Temperature °C RWC (%) Stomatal conductance (mmole m−2 s−1)
0 27.9±0.12 75.3±3.22 140±7.55
75 28.5±0.13 70.0±4.33 115±3.15
150 29.4±0.12 52.5±3.95 50.0±2.88
225 30.4±0.15 40.0±2.25 30.0±1.15
r +0.88 −0.85 −0.62

Leaf temperature were measured by ThermaCAM software FLIR SC 620.

Table 1 Average leaf temperature and their correlation with some physiological traits under drought stress. Seedlings of CaMsrB2 expressing transgenic lines and its wildtype were imposed by drought stress via withholding water prior to measure those physiological traits (Siddiqui et al. 2014). Correlations were calculated between plant tempertature and their physiological data.

Similar alphabet on each values represent non-significant at P=0.01) r=Correlation values Camera Model FLIR 620SC, software ThermaCAM.

Table 2 Average leaf temperature, relative water content (RWC) and stomatal conductance of rice plants under various salinity. Seedlings of rice genotypes, cvs. ‘Dongjin’ and ‘Ilmi’, were imposed by several NaCl salinity prior to measure those physiological traits using a protocol mentioned in Siddiqui et al. (2014b). Correlations were calculated between salinity and physiological changes.

Leaf temperature were measured by ThermaCAM software FLIR SC 620.

Table 1

Table 2

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