濒危物种四合木与其近缘种霸王遗传多样性的比较研究

 采用垂直板聚丙烯酰胺凝胶电泳技术，对西鄂尔多斯高原的濒危植物四合木(Tetraena mongolica)种群和生长于同一生境的普通种霸王(Zygophyllon xanthoxylon)种群的遗传多样性和遗传分化进行了比较研究。等位酶分析表明，与其他灌木相比，两种植物均维持较高的遗传多样性。但濒危植物四合木种群遗传多样性水平低于霸王种群，多态位点百分率P分别为60％和83.3％，等位基因平均数A为1.6和2.2，平均期望杂合度He为0.245和0.392。种群间遗传分化不明显，基因分化系数Gst为0.051和0.020。这一结果说明不同类型的濒危植物具有不同的遗传含义，采取的保护措施也不尽相同。

COMPARATIVE ANALYSIS OF GENETIC DIVERSITY IN THE ENDANGERE D SHRUB TETRAENA MONGOLICA AND ITS RELATED CONGENER ZYGOPHYLLUM XANTHOXYLON

Genetic diversity and differentiation in the endangered shrub Tetraena mongol ica were compared with those of its relative Zygophyllum xanthoxylon from the same habitat on the western Ordos Plateau using the method of vertical poly acrylamide gel electrophonesis. Allozyme data indicated that both plant species maintained a relatively high level of genetic variation as compared with other s hrubs. However the endangered shrub had lower population-level genetic variatio n, with P(Percentage of loci polymorphic)=60% and 83.3%, A(Mean No. of alleles p er locus) = 1 6 and 2.2, He(Mean expected heterozygosity) = 0.245 and 0.392 re spectively. Ge netic differentiation among populations was low with G st value being 0.051 and 0 .020 respectively. These results confirm that genetic issues are not the same, n or as pressing in all endangered plants, and that conservation strategies should therefore not all be the same.