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RISS 인기검색어
- 검색키워드
- 저자 : M. Akhlasur Rahman (검색결과 2 건)
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M. Ruhul Quddus,M. Akhlasur Rahman,Nusrat Jahan,Sanjoy K. Debsharma,Ribed F. Disha,M. Moniruzzaman Hasan,Tamal L. Aditya,KM Iftekharuddaula,Bertrand C.Y. Collard 한국육종학회 2019 Plant Breeding and Biotechnology Vol.7 No.3
In salinity affected areas, variation in salinity level is the major cause of yield fluctuations in rice during the dry season (boro season). To sustain food security in Bangladesh, plant breeders need to develop new rice varieties which are higher yielding, salinity tolerant and stable across different environments. We evaluated the yield performance and stability of 51 rice elite genotypes including two salinity tolerant rice varieties (BRRI dhan67 and BINA dhan-10) and the dominant boro rice variety (BRRI dhan28) in three locations, including a salinity “hotspot”. Best linear unbiased predictions (BLUPs) were used to identify superior genotypes from multi-environment trials. Selection from a large set of candidates is required for evaluation and recommending a new variety for release. Estimated breeding values (EBVs) were used to select parents. Six parents with high EBVs (BR8982-5, IR 87870-6-1-1-1-1-B; BR8943-B-1-2-7, BR8940-B-17-4-7, A69-1 and BR8943-B-5-5-14) would be useful as parents to develop new breeding populations. To evaluate yield performance and stability across environments, we used additive main effects and multiplicative interaction (AMMI) model using a randomized complete block design with two replications. Genotype × environmental analysis was performed using GGE biplot analysis. Based on yield performance and stability, BR8982-5, IR 87870-6-1-1-1-1-B, BR8943-B-1-2-7, BR8940-B-17-4-7, A69-1 and BR8943-B-5-5-14 were promising across the tested environments, as they showed yield advantages over check varieties. The results in this study will be useful for selecting the elite lines suitable for salinity affected areas and parents for rapid breeding of salinity tolerance.
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Dissecting QTLs for Reproductive Stage Salinity Tolerance in Rice from BRRI dhan 47
Sejuti Mondal,Teresita H. Borromeo,M. Genaleen Q. Diaz,Junrey Amas,M. Akhlasur Rahman,Michael J. Thomson,Glenn B. Gregorio 한국육종학회 2019 Plant Breeding and Biotechnology Vol.7 No.4
Salinity is a common and increasing problem in many coastal rice producing areas around the world. Salinity toleranceat the reproductive stage in rice is crucial as it determines grain yield. An F2 mapping population was developed from two modern ricecultivars contrasting in tolerance: NSIC Rc222 (a high-yielding salt-sensitive variety released in the Philippines) and BRRI dhan 47 (asalt-tolerant variety released in Bangaldesh). The performance of the F2 population showed transgressive segregation in the yieldcomponents under salinity stress of EC 10 dS/m under salinized field conditions. Ninety-six single nucleotide polymorphism (SNP)markers using 96-plex FluidigmTM genotyping were used to construct a linkage map of 1306.2 cM (Kosambi), with an average intervalsize of 13.6 cM. Seven putative quantitative trait loci (QTLs) for reproductive stage salinity tolerance traits having LOD values rangingfrom 2.9 to 4.1 were identified on chromosomes 1, 2, 5 and 11, explaining 13.4 to 18.4% of the phenotypic variation. Results of thismapping study identified a genomic region on chromosome 2 that confers salinity tolerance at the reproductive stage as measured by thenumber of filled spikelets, percent filled spikelets and yield. This study reports the molecular mapping of QTLs controlling reproductive-stage salinity tolerance-related traits, which will be useful in marker-assisted selection and breeding population developmentin rice.
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