Indications for Three Independent Domestication Events for the Tea Plant (Camellia sinensis (L.) O. Kuntze) and New Insights into the Origin of Tea Germplasm in China and India Revealed by Nuclear Microsatellites

文献类型： 外文期刊

第一作者： Meegahakumbura, M. K.

作者： Meegahakumbura, M. K.;Wambulwa, M. C.;Li, M. M.;Liu, J.;Li, D. Z.;Gao, L. M.;Meegahakumbura, M. K.;Wambulwa, M. C.;Yang, J. B.;Li, D. Z.;Meegahakumbura, M. K.;Wambulwa, M. C.;Li, M. M.;Li, D. Z.;Meegahakumbura, M. K.;Wambulwa, M. C.;Thapa, K. K.;Moller, M.;Xu, J. C.;Ranjitkar, S.;Xu, J. C.;Ranjitkar, S.;Liu, B. Y.

作者机构：

期刊名称：PLOS ONE （ 影响因子：3.24； 五年影响因子：3.788 ）

ISSN： 1932-6203

年卷期： 2016 年 11 卷 5 期

页码：

收录情况： SCI

摘要： Background Tea is the world's most popular non-alcoholic beverage. China and India are known to be the largest tea producing countries and recognized as the centers for the domestication of the tea plant (Camellia sinensis (L.) O. Kuntze). However, molecular studies on the origin, domestication and relationships of the main teas, China type, Assam type and Cambod type are lacking. Methodology/Principal Findings Twenty-three nuclear microsatellite markers were used to investigate the genetic diversity, relatedness, and domestication history of cultivated tea in both China and India. Based on a total of 392 samples, high levels of genetic diversity were observed for all tea types in both countries. The cultivars clustered into three distinct genetic groups (i.e. China tea, Chinese Assam tea and Indian Assam tea) based on STRUCTURE, PCoA and UPGMA analyses with significant pairwise genetic differentiation, corresponding well with their geographical distribution. A high proportion (30%) of the studied tea samples were shown to possess genetic admixtures of different tea types suggesting a hybrid origin for these samples, including the Cambod type. Conclusions We demonstrate that Chinese Assam tea is a distinct genetic lineage from Indian Assam tea, and that China tea sampled from India was likely introduced from China directly. Our results further indicate that China type tea, Chinese Assam type tea and Indian Assam type tea are likely the result of three independent domestication events from three separate regions across China and India. Our findings have important implications for the conservation of genetic stocks, as well as future breeding programs.

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