摘要
对矮慈姑（ＳａｇｉｔａｒｉａｐｙｇｍａｅａＭｉｑ）的传粉过程与花粉流作了观察，用同工酶遗传标记法对其一个自然居群的异交率作出定量估计。在自然及人工居群中均观察到虫媒传粉，其中有较大比例的近距离传粉。未检出风媒花粉流。自交可育，同时存在雌雄同株和花序内雌雄花异熟等异交机制。异交率估计结果（ｔ＝４９９％）表明其交配系统为异交／自交兼性系统。作者认为。
The pollination mechanism and mating system of Sagittaria pygmaea were studied synthetically. In natural or experimental populations, interfloral pollination by insects was observed, and the pollen flows are mediated by insect pollination. Most pollen grains moved by pollinators are very near to neighbors, occasionally longer distance pollination is occurred. The pollen flows mediated by wind were not found. Results of artificial isolation and pollination showed that the fruit-sets after artificial selfing/outcrossing were considerably high, and that the monoecy and dichogamy in inflorescence were outcrossing mechanisms. Using isozyme genetic markers, the mating system parameter of a population in this species was estimated quantitatively. According to the value of the outcrossing rate(t=49.9%), the mating system of the species studied could be a concurrent selfing/outcrossing system. The authors deduced that the higher rate of selfing of population in S pygmaea should be due to the frequency of crossing between different ramets in the same indivadual.
出处
《云南植物研究》
CSCD
1999年第2期225-231,共7页
Acta Botanica Yunnanica
基金
国家自然科学基金
关键词
矮慈姑
传粉机制
交配系统
异交率
Sagittaria pygmaea , Pollination mechanism, Mating system, Outcrossing rate
