内蒙古中东部草原大针茅的种群遗传分化

对内蒙古中东部草原区分布的 11个大针茅 (Stipa grandis P. Smirn)地理种群进行了 RAPD分析。从 10 0个随机引物中筛选出 18个有效引物 ,共扩增出 2 2 1条 DNA带 ,多态性 DNA带 12 1条 ,占 5 4 .75 % ,平均每个引物扩增的 DNA带数为 12 .2 8条 ;特异性 DNA带 2 5条 ,占 11.31%。基于 Jaccard遗传相似性系数对此 2 2 1条 DNA带进行 U PGMA聚类分析 ,将 11个种群分为 3类 ,白音锡勒牧场的 8个种群聚为一类 ,林西种群和克什克腾种群两个种群聚为一类 ,阿巴嘎种群单独成为第 3类。用Mantel检验作进一步分析表明 ,在相对较大的尺度上 ,大针茅的遗传分化与地理距离相关极显著 (g>g0 .0 0 5) ;而在相对较小的尺度上 (白音锡勒牧场 8个种群 ) ,相关不显著 (gg0 .0 5)。

An analysis of genetic differentiation between Stipa grandis populations in middle and eastern Inner Mongolia steppe

Stipa grandis P. Smirn, an important perennial tussock grass in the Inner Mongolia steppe in China, is palatable for livestock and rich in nutrients, and is grazed by cattle and sheep at different stages of its growth cycle. Form. Stipa grandis is one of the major formations of the moderately-temperate steppe in Central Asia, and has considerable ecological and economic importance as it is not only suitable for grassland farming, but also provides an environmental defense for the Beijing-Tianjin area. ...