Genetic diversity associated with conservation of endangered Dongxiang wild rice (Oryza rufipogon)
文献类型： 外文期刊
作者： Xie, J. 1 ; Agrama, H. A. 3 ; Kong, D. 2 ; Zhuang, J. 4 ; Hu, B. 1 ; Wan, Y. 2 ; Yan, W. 5 ;
作者机构： 1.Jiangxi Normal Univ, Coll Life Sci, Nanchang 330027, Jaingxi, Peoples R China
2.Jiangxi Acad Agr Sci, Biotechnol Res Inst, Nanchang 330200, Jaingxi, Peoples R China
3.Univ Arkansas, Rice Res & Extens Ctr, Stuttgart, AR 72160 USA
4.China Natl Rice Res Inst, Hangzhou 31006, Zhejiang, Peoples R China
5.USDA ARS, Dale Bumpers Natl Rice Res Ctr, Stuttgart, AR 72160 USA
关键词： Dongxiang wild rice;Genetic diversity;Oryza rufipogon;Plant germplasm;in situ and ex situ conservation
期刊名称：GENETIC RESOURCES AND CROP EVOLUTION （ 影响因子：1.524； 五年影响因子：1.713 ）
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收录情况： SCI
摘要： The wild progenitor species (Oryza rufipogon) of Asian cultivated rice (O. sativa L.) is located in Dongxiang county, China which is considered its the northernmost range worldwide. Nine ex situ and three in situ populations of the Dongxiang wild rice (DXWR) and four groups of modern cultivars were genotyped using 21 SSR markers for study of population structure, conservation efficiency and genetic relationship. We demonstrated that the ex situ conservation of the DXWR failed to maintain the genetic identity and reduced genetic diversity. Therefore, in situ conservation is absolutely necessary to maintain the genetic identity, diversity and heterozygosity. Also, in situ conservation is urgently needed because natural populations in DXWR have decreased from nine to three at present due to farming activity and urban expansion. In DXWR, the three surviving in situ populations had greater expected heterozygosity than any cultivated rice, and were genetically closer to japonica than either the male-sterile maintainer or restorer lines, or indica. Japonica has the lowest genetic diversity of cultivated rice. As a result, DXWR is a rich gene pool and is especially valuable for genetic improvement of japonica rice because these O. rufipogon accessions are most closely related to the japonica as compared to O. rufipogon collected anywhere else in the world.
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