东北春大豆花荚脱落性状与SSR标记的关联分析

Association Mapping of Flower and Pod Abscission with SSR Markers in Northeast Spring Sowing Soybeans

  • 摘要: 花荚脱落是大豆生殖生长过程中的一种自我调节现象,同时也是限制大豆产量提高的主要因素之一。为了筛选与大豆花荚脱落相关的SSR标记位点,研究分别以2011年种植的104个和2012年种植的314个东北春大豆种品种组成的两个自然群体为材料,选用分布于20个连锁群的205对SSR引物对供试材料进行基因分型。利用TASSEL软件包中的GLM程序,以Q值作为协变量,进行花荚脱落性状与SSR标记的关联分析。结果显示,在供试材料中共检测到763个等位变异,每个标记有2~12个等位变异,每个标记多态性信息量为0.054~0.771。花荚脱落性状与SSR标记的关联分析表明,共有33个SSR标记位点与东北春大豆花荚脱落性状显著相关,在2011年和2012年均检测到的位点有4个,分别为B2连锁群上的Satt534、E连锁群上的Satt452、J连锁群上的Satt244以及O连锁群上的Satt478。本研究结果为选育出花荚脱落率低的东北春大豆的标记辅助育种提供了理论依据。

     

    Abstract: Flower and pod abscission is a self-adjusting phenomenon in the reproductive stage of soybean,which is one of the most important factors restricting soybean yield.Elite SSR markers associated with the flower and pod abscission rate in the northeast spring sowing soybean,consisting of 104 (in 2011) and 314 (in 2012) accessions were measured at flowering and maturation stage under the same field management in Mudanjiang experimental locations,China.A total of 205 SSR markers distributing on the 20 linkage groups of soybean were utilized to genotype the tested materials.The linkage disequilibrium and the structure of the population were analyzed by TASSEL 2.1 and STRUCTURE 2.3.The association analysis between SSR and flower and pod abscission rate was performed using TASSEL GLM (general linear model) program with the Q value as the covariate,aimed to screen out the loci with significant effects on the flower and pod abscission of northeast spring soybeans.A total of 763 alleles were identified on 205 SSR loci,and each locus had 2-12 alleles.The polymorphism information contents (PICs) of the SSR loci ranged from 0.054~0.771.33 SSR loci were found to be significantly associated with flower and pod abscission rate on the 205 SSR markers.The results showed that,both in 2011 and 2012,four SSR loci associated with the phenotype of flower and pod abscission rate were detected,and they were mapped on the Satt534(B2),Satt452(E),Satt244(J),Satt478(O).The results of this study are meaningful for the marker assisted selection breeding of northeast spring sowing soybean varieties with low flower and pod abscission rate quality.

     

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