Marker - trait association analysis for yield related traits in rice (Oryza sativa L.)

Y. Kumar, S. Sinha, Saurav Kumar, S. Tomar, Mankesh Kumar, Amit Kumar, S. P. Singh
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Abstract

This study was undertaken to identify marker-trait associations for twelve yield related traits with a set of 48 rice genotypes. A total of 38 polymorphic SSR markers across the 12 chromosomes of rice were used for the association analysis. Marker-trait associations were performed using mixed linear model approach. A total of 84 significant marker-trait associations were detected at Pd £ 0.05 with the R2 values ranging from 6.71 to 27.24%. The most significant marker associations for days to 50% flowering on chromosome 12 with RM17, plant height on chromosome 4 with RM7051, panicle length on chromosome 7 with RM125, flag leaf length on chromosome 9 with RM219, flag leaf breadth on chromosome 10 with RM216, effective tiller per plant on chromosome 5 with RM164, total grains per panicle on chromosome 12 with RM28305, hundred grain weight on chromosome 1 with RM6324, grain yield per plant and grain length on chromosome 8 with RM8264, grain breadth on chromosome 7 with RM320 and grain length-breadth ratio on chromosome 1 with RM6324. The present study has revealed that the twenty-three markers showed association with more than one trait and correlated traits such as panicle length, total grains per panicle, hundred grain weight, grain yield per plant, grain length, grain breadth and grain length-breadth ratio were located in the same chromosome regions. These traits may be controlled by genes which have pleotropic effect. The result suggest that marker-trait association analysis is a fascinating tool to identify marker-trait association for complex traits using diverse rice genotypes. The SSR markers identified in this study would be useful in marker assisted selection for the improvement of yield related traits in rice.
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水稻产量相关性状的标记-性状关联分析
本研究对48个水稻基因型的12个产量相关性状进行了标记-性状关联鉴定。利用水稻12条染色体上的38个多态性SSR标记进行关联分析。使用混合线性模型方法进行标记-性状关联。在Pd = 0.05下,共检测到84个显著标记-性状相关,R2值为6.71 ~ 27.24%。12号染色体花日至50%最显著的标记为RM17, 4号染色体株高为RM7051, 7号染色体穗长为RM125, 9号染色体旗叶长为RM219, 10号染色体旗叶宽为RM216, 5号染色体有效分蘖数为RM164, 12号染色体每穗总粒数为RM28305, 1号染色体百粒重为RM6324,8号染色体单株产量和粒长RM8264, 7号染色体粒宽RM320, 1号染色体粒长宽比RM6324。结果表明,23个标记与1个以上性状相关,且穗长、每穗总粒数、百粒重、单株产量、粒长、粒宽、粒长宽比等相关性状均位于同一染色体区域。这些性状可能受具有多效性的基因控制。结果表明,标记-性状关联分析是鉴定水稻不同基因型复杂性状的标记-性状关联的有效工具。本研究所鉴定的SSR标记可用于水稻产量相关性状的标记辅助选择。
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