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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.