A preliminary study on population genetic structure and phylogeography of the wild and cultivated Zizania latifolia (Poaceae) based on Adh1a sequences |
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Authors: | Xin-wei Xu Wei-dong Ke Xiao-ping Yu Jun Wen Song Ge |
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Institution: | (1) State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China;(2) Freshwater Ecological Field Station of Liangzi Lake, Wuhan University, Wuhan, 430072, China;(3) National Garden of Aquatic Vegetable, Wuhan Institute of Vegetable Sciences, Hubei, 430065, China;(4) Plant Protection and Microbe Institute, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China;(5) Department of Botany, National Museum of Natural History, Smithsonian Institute, MRC 166, Washington, DC 20013-7012, USA;(6) Graduate School, Chinese Academy of Sciences, Beijing, 100039, China |
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Abstract: | Recent decades have witnessed growing interests in exploring the population genetics and phylogeography of crop plants and
their wild relatives because of their important value as genetic resources. In this study, sequence variation of the nuclear
Adh1a gene was used to investigate the genetic diversity and phylogeographic pattern of the wild and cultivated Zizania latifolia Turcz. Sequence data were obtained from 126 individuals representing 21 wild populations in China and 65 varieties of the
cultivated Zizania latifolia. Low to medium level nucleotide diversity was found in the wild populations, with northeastern populations being the most
variable. We detected significant population subdivision (F
ST = 0.481) but no significant phylogeogaphical structure, suggesting limited gene flow and dispersal among populations. The
current pattern of genetic variation in the wild populations might be explained by a fragmentation of ancient populations
due to habitat destruction and degradation during recent decades. The heterogeneous levels and spatial apportionment of genetic
diversity among wild populations also suggested a history of gradual colonization of Zizania latifolia populations from the northeast to the south of China. Interestingly, all 65 varieties of the cultivated Zizania latifolia possessed a single identical genotype, implying a single domestication associated with very few initial individuals.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. |
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