Rice Breeding in Bangladesh started with establishment of Bangladesh Rice Research Institute (BRRI) in 1970. It aimed at developing modern rice cultivars to benefit farmers. Among BRRI developed varieties, BR11 is considered as most popular Transplanted Aman cultivar having high yield (6.0 t/ha), bold grain and high amylose content. On the other hand, BRRI dhan28 and BRRI dhan29 are most popular Boro rice varieties for Irrigated areas. Because, they produce high yield across diverse rice growing areas. BRRI dhan29 is widely grown in haors where rice is grown once in a year. BRRI dhan28 and BRRI dhan29 accounted for 50% of total Boro rice areas. As a whole, the popularity of the cultivars BR11, BRRI dhan28 and BRRI dhan29 influenced subsequent rice breeding trends and characteristics of new rice varieties. In this review, the pedigree information revealed that IR20 and IR5 acted as key foundation parents in developing the rice cultivar BR11 and BRRI dhan29. In contrast, same parental lineage of renowned IR64 contributed in developing BRRI dhan28. The breeding history, agronomic traits, grain quality and molecular characteristics of above cultivars have been discussed briefly. Thus, the background information generated from this review might help in developing breeding lines with higher genetic diversity, improved tolerance to biotic and abiotic stresses to obtain higher genetic gain from a breeding program. Furthermore, basic studies on these varieties and their important progenies might help to disclose the complex genetic control of yield as well as other qualitative traits prioritized by farmers and consumers.
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The detection of the presence and expression of transgenes in genetically modified plants is a key step in the process of selecting promising lines. We adapted two methods developed for detecting tolerance to the herbicide imazapyr for selection of transgenic lines expressing the mutated acetohydroxyacid synthase enzyme (AHAS) from
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Development of salt tolerance in rice through breeding program is mainly depends on the salinity responses of the potential rice germplasms. Coastal rice landraces of Bangladesh possess diverse morphological and physiological responses to salinity. Hence, our target is to identify candidate salt-tolerant coastal rice genotypes as a new source of salt tolerance (12 dS/m). Here, we annotated 20 Bangladeshi coastal
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Sorghum is the fifth most important grain crop worldwide. It is not only used as food and feed, but also as a resource for biofuel production. In addition, it has potential uses as a model plant for research on adaptation to environmental stress. In this study, mutant sorghum lines were generated by gammy ray irradiation. Ten of the M6 sorghum mutant lines were selected from 28 mutant lines on the basis of agronomic characteristics. These 10 lines, along with their original accessions/cultivar, were evaluated to determine the germination rate and the shoot and root length under salt treatment. Compared with their original accessions, three mutant lines (B5, SY6, and SY7) showed significant differentiation under saline conditions (150 mM NaCl), with increased shoot length (by 1.3-2.2 times) and root length (by 1.5-2.5 times). We determined the transcript levels of 20 abiotic stress-responsive genes in B5 (the most salt-tolerant mutant) and its original accession. These genes included those encoding heat shock proteins, aquaporins, ROS scavenging system, and transcription factors. In the B5 mutant, 15 genes showed differences in transcript levels between the control and the salt treatment. Salt treatment resulted in significant up-regulation of Sb03g045840 and down-regulation of Sb3g030750 in the B5 mutant. Here, we reported a simple method to identify genes related to salt tolerance in a sorghum mutant.
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A total of 857 rice breed lines were used to evaluate rice blast resistance. Frequency of leaf spot index was skewed to the right of the 1-9 scale in bar plot, with a score of 7 showing the highest frequency. The average spot index score of 857 breed lines was 5.33. Associations showing higher than the threshold of ‒log10(P) = 5.17 were detected as significant associations. Significantly associated single nucleotide polymorphism (SNP) markers located within ± 250 kb on the lead SNP position was designated to one QTL locus of lead SNP markers. Five association loci were detected. Two associated QTLs detected on Chr. 4 were designated as qRB4.1 and qRB422, explaining 17.8% and 14.3% of total phenotypic variations, respectively. Associated QTLs detected on Chr. 1, 11, and 12 (one each) designated as qRB1, qRB11 and qRB12 explained 44.6%, 9.09%, and 13.7% of total phenotypic variations, respectively. We compared previously reported QTLs. The location of qRB4.2 was overlapped with the previously reported QTL for blast field resistance. The location of qRB12 was also overlapped with the field resistance leaf blast. The other one, qRB4.1, was overlapped with bacterial blight resistance.
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