A study on population genetic structure of Oryza meyeriana (Zoll. et Mor. ex Steud.) Baill. from Yunnan and its in situ conservation significance

In order to determine genetic diversity of Oryza 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 genus Oryza, 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 developing in situ conservation management. Meanwhile     

云南疣粒野生稻的居群遗传结构及其在原位保护中的意义

用 1 2种酶系统 1 7个等位酶位点对采自云南思茅地区疣粒野生稻Oryzameyeriana(Zoll.etMerr.exSteud .)Baill.7个居群的 1 6 4个个体进行了遗传多样性的研究 .相对于以前报道过的具有相同生活史特性和繁育系统的种子植物和稻属中的其他种类 ,疣粒野生稻的遗传多样性水平极低 (A =1 .1 ,P =8.0 % ,H_o=0 .0 0 4和H_e=0 .0 1 5 ) ,但居群间的遗传分化较大 .F_ST高达 0 .6 4 9,表明在遗传变异总量中的6 4 .9%存在于居群间 .对这样在较小的地理区域内居群间就呈现出剧烈遗传分化的物种来说 ,大多居群均有保护的价值 .因此 ,进行原位保护时原则上应建立较大的自然保护区 ,涉及较多数目的居群 .同时 ,提出了在云南进行原位保护时应优先考虑的地点 .