Genetic diversity and origin of weedy rice (Oryza sativa f. Spontanea) populations found in North-eastern China revealed by simple sequence repeat (SSR) markers
Genetic diversity and origin of weedy rice (Oryza sativa f. Spontanea) populations found in North-eastern China revealed by simple sequence repeat (SSR) markers
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DOI：
10.1093/aob/mcl210
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发表时间：
2006-12-01
期刊：
影响因子：
4.2
通讯作者：
Grassi, Fabrizio
中科院分区：
文献类型：
--
作者：
Cao, Qianjin;Lu, Bao-Rong;Grassi, Fabrizio
背景和目的杂草稻（Oryza sativa f.旱稻（spontanea）是世界范围内水稻种植区最臭名昭著的杂草之一。本研究旨在通过比较辽宁省杂草稻群体与水稻品种（O. sativa）和野生稻（O.方法利用SSR标记对辽宁省30个杂草稻群体（每个群体约30个个体）、水稻品种和野生稻进行遗传多样性分析。普通猪毛菜结果辽宁省杂草稻群体的遗传多样性总体较高（H-e = 0.313，I = 0.572），区域间的遗传变异占35%左右。辽宁杂草稻群体与辽宁水稻品种和其他地区粳稻品种亲缘关系较近，与籼稻品种和野生稻品种亲缘关系较远。结论辽宁杂草稻群体遗传变异较大，很可能是由辽宁水稻品种通过突变和品种间杂交而形成的。近年来耕作方式和栽培方法的改变，沿着减少了杂草管理，这可能促进了中国东北杂草稻的重新出现和分化。
Background and Aims Weedy rice (Oryza sativa f. spontanea) is one of the most notorious weeds occurring in rice-planting areas worldwide. The objectives of this study are to determine the genetic diversity and differentiation of weedy rice populations from Liaoning Province in North-eastern China and to explore the possible origin of these weedy populations by comparing their genetic relationships with rice varieties (O. sativa) and wild rice (O. rufipogon) from different sources.Methods Simple sequence repeat (SSR) markers were used to estimate the genetic diversity of 30 weedy rice populations from Liaoning, each containing about 30 individuals, selected rice varieties and wild O. rufipogon. Genetic differentiation and the relationships of weedy rice populations were analysed using cluster analysis (UPGMA) and principle component analysis (PCA).Key Results The overall genetic diversity of weedy rice populations from Liaoning was relatively high (H-e = 0.313, I = 0.572), with about 35 % of the genetic variation found among regions. The Liaoning weedy rice populations were closely related to rice varieties from Liaoning and japonica varieties from other regions but distantly related to indica rice varieties and wild O. rufipogon.Conclusions Weedy rice populations from Liaoning are considerably variable genetically and most probably originated from Liaoning rice varieties by mutation and intervarietal hybrids. Recent changes in farming practices and cultivation methods along with less weed management may have promoted the re-emergence and divergence of weedy rice in North-eastern China.