摘要
用自然居群取样和单位点同工酶遗传标记的方法对小慈姑（Ｓａｇｉｔａｒｉａｐｏｔａｍｏｇｅｔｉｆｏｌｉａ）湖南茶陵居群中两个亚居群的异交率作了研究．密度较低的亚居群Ⅰ与密度较高的亚居群Ⅱ的异交率估计值分别为ｔ—∧Ⅰ＝（８１．９±２４．１）％和ｔ—∧Ⅱ＝（５０±２４．５）％．作者认为，对雌雄同株的小慈姑而言，居群中一定水平的自交应归因于同株不同花序间雌雄花的交配，异交率的高低不取决于居群密度而主要取决于同期开花花序在２个或２个以上的植株的数量．
The outcrossing rates of two subpopulations in a population of Sagittaria potamogetifolia were estimated by sampling from natural habitats and using single genetic marker locus. The value of subpopulation Ⅰ ( t —∧ Ⅰ = (81.9±24.1)%) is remarkably higher than that of subpopulation Ⅱ ( t —∧ Ⅱ = (50.0±24.5)%), while subpopulation Ⅱ had a higher density. For the monoecius spicies S. potamogetifolia , a rate of selfing in a population should be due to the pollination between different inflorescences of same plant, and the levels of selfing/outcrossing in populations should be dependent on the frequency of the individuals with more than two inflorescences.
出处
《武汉大学学报（自然科学版）》
CSCD
1998年第2期217-220,共4页
Journal of Wuhan University(Natural Science Edition)
关键词
小慈姑
自然居群
异交率
泽泻科
Sagittaria potamogetifolia , natural population, outcrossing rate
