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A study on population genetic structure of Oryza meyeriana (Zoll. et Mor. ex Steud.) Baill. from Yunnan and its in situ conservation significance
Authors:GAO Lizhi GE Song HONG Deyuan ZHANG Jiongwei LUO Qingyan TAO Guoda XU Zaifu
Institution:(1) Institute of Crop Germplasm Resources, Chinese Academy of Agricultural Sciences, 100081 Beijing, China;(2) Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, 100093 Beijing, China;(3) Simao Prefecture Institute of Agricultural Sciences, 665000 Simao, China;(4) Xishuangbanna Tropical Botanical Garden, 666100 Mengla, China
Abstract:In order to determine genetic diversity ofOryza meyeriana (Zoll. et Mor. ex Steud.) Baill., 12 enzyme systems encoded by 17 loci were electrophoretically analyzed in 164 individuals of seven populations from Simao Prefecture, Yunnan Province, China. In comparison with those seed plants with the same life history and breeding systems, as well as the other species in the genusOryza, the species shows rather low levels of genetic diversity (A = 1.1,P = 8.0 %, Ho = 0.004 and He = 0.015) within populations and high genetic differentiation among populations. Fst was up to 0. 649, suggesting that 64. 9% of total genetic variability exists among populations. Considering high genetic differentiation among populations from a limited geographic region, most of the populations of the species are worth being protected, and therefore, great natural protection regions should theoretically be established in which a great deal of populations should be involved for developingin situ conservation management. Meanwhile, some priory localities forin situ conservation ofO. meyerzana in Yunnan Province, were proposed. Project supported by the Grant of the President of the Chinese Academy of Sciences.
Keywords:Oryza meyeriana (Zoll  et Mor  ex Steud  ) Baill    allozyme analysis  Yunnan  population genetic structure            in situ conservation
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