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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 F2 mapping population derived from a Sadri/FL478 cross was exposed to saline field conditions (6a€“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 F2 progenies. Totally 35 QTLs for 11 traits under salinity stress were detected with LOD 3, out of which 28 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 (RM423a€“RM174), 4 (RM551a€“RM518) and 6 (RM20224a€“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stage期后，将从Sadri / FL478杂交得到的F2作图种群暴露于盐田条件下（6a-8” dS m-1），以鉴定生殖期对耐盐性的特异性QTL。使用232个F2后代上的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号染色体（RM423a→RM174），4号（RM551a→RM518）和6号（RM20224a→RM528）上发现了三个主要的QTL簇。两条亲本系对确定产量构成部分的QTL的加和作用。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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