小慈姑自然居群异交率的定量估测

小慈姑自然居群异交率的定量估测 QUANTITIVE ESTIMATES OF OUTCROSSING RATES IN A NATURAL POPULATION OF SAGITTARIA POTAMOGETIFOLIA 汪小凡 Wang Xiaofan 1 first-author 陈家宽 Chen Jiakuan 1 武汉大学生命科学学院 武汉大学生命科学学院 College of Life Sciences, Wuhan University College of Life Sciences, Wuhan University 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. 小慈姑 自然居群 异交率 Sagittaria potamogetifolia natural population outcrossing rate Q948.15;S645.9 1998-02-01 2021-04-01 2