内蒙古草原三个优势针茅种群的自交繁殖能力研究

A Research on Self-compatibility of Three Dominant Species of Stipa spp.in Inner Mongolia Steppe

传粉方式是植物生态适应性的重要表现,通过对内蒙古典型草原优势种大针茅(Stipa grandis)、克氏针茅(Stipa krylovii)和草甸草原优势种贝加尔针茅(Sitpa baicalensis)花果期套袋处理,测定了其自交繁殖能力.三种针茅套袋处理都产生了相当数量的有效结实,且种子均能很好萌发,其中大针茅和克氏针茅套袋处理千粒重和萌发力总体优于自然条件未套袋的对照处理,贝加尔针茅略低于对照处理.结果表明:三种针茅均自交亲和,并有很强的自交能力,其中大针茅和克氏针茅的自交能力较高,贝加尔针茅的相对较低.

Pollination pattern is a key performance in ecological adaptability of plants. Stipa grandis,S, krylovii distributed in typical steppes, and S. baicalensis distributed in meadow steppes are three dominant species in Inner Mongolia. Their selfing ability was measured by bagging during the flowering and fruiting periods. Three dominant species of Stipa can produce abundant plump seeds after treated by bagging,and the seeds can well germinate. The 1000-grain weight and germi- nation of Stipa grandis and S. krylovii by bagging are better than that of natural growth,but that of S. baicalensis is lower. The results showed that the three species of Stipa are self-compatible, the selling ability of S. grandis and S. krylovii are relatively high,while S. baicalensis is little lower.