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利用47个根据已报道的QTL位点或者已被精细定位或克隆的与水稻产量性状基因紧密连锁的产量位点标记,对来自中国、印度和越南等国的58份水稻恢复系进行遗传多样性分析。结果表明:(1)在中国恢复系中,47个产量位点标记中有36个具有多态性,共检测到90个等位基因,每个标记检测到等位基因2~4个,平均为2.500个;有效等位基因共62.905个,平均每个标记1.747个;36个有效标记的Shannon信息指数平均值为0.632,变幅为0.271~1.266。(2)在来自国外的材料中,47个产量位点标记均具有多态性,共检测到131个等位基因,每个标记检测到的等位基因数为2~6个,平均2.787个;有效等位基因数共82.686个,平均1.759个;47个标记的Shannon信息指数平均值为0.649,变幅为0.109~1.110。(3)聚类分析显示,在遗传相似系数为0.73水平上,参试资源聚为三大类群,中国资源多聚在第Ⅰ类群下的第1、2、3亚群,越南资源多聚在第Ⅰ-4亚群,孟加拉资源多聚在第Ⅲ-3亚群。由此表明,中国资源遗传基础较为狭窄,而其他国家的恢复系具有较远的亲缘关系。
Forty-eight rice restorer lines from China, India and Vietnam were genotyped for genetic diversity using 47 QTLs reported or closely linked to the yield trait genes of rice that have been finely mapped or cloned analysis. The results showed that: (1) Of the 47 restorer loci in China, 36 were polymorphic with 90 alleles detected, 2-4 alleles were detected in each marker, and the average 2.500, 62.905 effective alleles, with an average of 1.747 for each marker. The average Shannon’s information index of 36 valid markers was 0.632, ranging from 0.271 to 1.266. (2) Among the materials from foreign countries, 47 loci were polymorphic and 131 alleles were detected. The number of alleles detected per locus ranged from 2 to 6, with an average of 2.787 The number of effective alleles was 82.686 with an average of 1.759. The average Shannon’s information index of 47 markers was 0.649, ranging from 0.109 to 1.110. (3) Cluster analysis showed that the genetic resources clustered into three major groups at genetic level of 0.73, and Chinese resources clustered in the first, In subgroups I-4, Bangladesh resources are clustered in subgroups III-3. This shows that the genetic basis of China’s resources is more narrow, while other countries have a distant genetic relationship.