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首页> 外文期刊>Journal of genetics >Mapping quantitative trait loci associated with yield and yield components under reproductive stage salinity stress in rice (Oryza sativa L.)
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Mapping quantitative trait loci associated with yield and yield components under reproductive stage salinity stress in rice (Oryza sativa L.)

机译：水稻（Oryza sativa L.）生殖期盐分胁迫下与产量和产量构成有关的数量性状基因座图

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摘要

Salinity tolerance in rice is critical at reproductive stage because it ultimately determines grain yield. An F_2 mapping population derived from a Sadri/FL478 cross was exposed to saline field conditions (6-8 dS m~(?1)) after the active tillering stage to identify reproductive stage specific QTLs for salinity tolerance. Genetic linkage map was constructed using 123 microsatellite markers on 232 F_2 progenies. Totally 35 QTLs for 11 traits under salinity stress were detected with LOD >3, out of which28 QTLs that explained from 5.9 to 30.0% phenotypic variation were found to be significant based on permutation test. Three major QTL clusters were found on chromosomes 2 (RM423-RM174), 4 (RM551-RM518) and 6 (RM20224-RM528) for multiple traits under salinity stress. Both parental lines contributed additively for QTLs identified for the yield components. A majority of the QTLs detected in our study are reported for the first time for reproductive stage salinity stress. Fine-mapping of selected putative QTLs will be the next step to facilitate marker-assisted backcrossing and to detect useful genes for salinity tolerance at the reproductive stage in rice.
机译：水稻的耐盐性在生殖阶段至关重要，因为它最终决定了谷物的产量。在活跃的分er期后，将来自Sadri / FL478杂交的F_2定位种群暴露于盐田条件下（6-8 dS m〜（？1）），以鉴定生殖期对耐盐性的特异性QTL。利用232个F_2后代中的123个微卫星标记构建了遗传连锁图谱。在盐分胁迫下，共检测到11个性状的35个QTL，LOD> 3，根据置换测试，发现28个QTL在表型变异范围从5.9％到30.0％显着。在盐度胁迫下，多个性状在2号（RM423-RM174），4号（RM551-RM518）和6号（RM20224-RM528）上发现了三个主要的QTL簇。两条亲本系对确定了产量组成部分的QTL的加和贡献。在我们的研究中检测到的大多数QTL首次报道了生殖期盐度胁迫。选定推定QTL的精细映射将是下一步，以促进标记辅助的回交并检测水稻生殖阶段耐盐性的有用基因。

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