元阳3个长期连续栽培水稻地方品种内部遗传异质性分析

水稻地方品种是稻种资源的重要组成部分,遗传多样性十分丰富,具有推广改良品种所缺少或没有的优质种质,是水稻育种和稻种起源、进化研究不可缺少的过渡材料。目前,对水稻地方品种间遗传多样性研究较多,而对其内部异质性研究甚微。本研究用24对微卫星(SSR)引物对云南元阳梯田3个栽种历史悠久的水稻地方品种的内部遗传异质性进行了分析。共检测出117个等位基因,香农指数为红脚老粳居群(0.5911)>白脚老粳A居群(0.4875)>月亮谷居群(0.3070)。结果显示:3个地方品种的内部遗传异质性丰富,且遗传异质性主要得益于个体间,而非居群间。

Intra-varietal Genetic Heterogeneity of 3 Rice Landraces in Yuanyang

Rice landrace is the main part of resources in rice (Oryza sativa L.). It has abundant genetic diversity and excellent characters that the current widely-planted variety has not. It is the indispensable resources to breed and study the origin and evolution of rice species. Inter-varietal genetic diversity were attended; however, intra-varietal genetic heterogeneity were not. Twenty-four SSR markers were used to evaluate the intra-varietal heterogeneity of 3 rice landraces that has been continuously planted generation to generation in Yuanyang terraces of Yunnan Province, China. A total of 117 SSR alleles were revealed, and the Shannon's information index of 3 populations were Hongjiaolaojing (0.5911) > Baijiaolaojing (0.4875) > Yuelianggu (0.3070). The results of this study showed that they have abundant intra-varietal heterogeneity in 3 rice landraces. The contribution rate of genetic heterogeneity among plants individual is higher than among populations.