Charlesworth D, Yang Z
Department of Ecology and Evolution, University of Chicago, IL 60637, USA.
Heredity (Edinb). 1998 Oct;81 ( Pt 4):453-61. doi: 10.1046/j.1365-2540.1998.00415.x.
Levels of allozyme diversity were studied in five species of the annual plant genus Leavenworthia. The breeding systems of the populations were also characterized in terms of measures of autogamous seed-set and self-fertility. The populations that appeared more inbreeding by these criteria also tended to have lower within-population gene diversity (Hs) values, but there was nevertheless considerable allozyme variability in two of the four sets of inbred populations studied. Comparing the outcrosser L. stylosa and the related inbreeders L. uniflora and L. torulosa the reduction in diversity associated with inbreeding was very high, as no variants were seen within populations of the inbreeders. In L. crassa and L. alabamica, the reduction was lower, but correcting for the fact that this comparison is over less extreme selfing rate differences, it is estimated that the difference between extreme inbreeding and outcrossing populations of L. crassa considerably exceeds twofold. These results are compared with published studies within closely related taxa with different inbreeding levels. The effect of inbreeding on allozyme diversity is consistently larger than has been estimated from comparisons of unrelated species.
对一年生植物Leavenworthia属的五个物种的等位酶多样性水平进行了研究。还根据自花授粉结实率和自交育性的测量指标对种群的繁育系统进行了特征描述。根据这些标准表现出更多自交的种群，其种群内基因多样性（Hs）值往往也较低，但在所研究的四组自交种群中的两组中，仍存在相当大的等位酶变异性。比较异交种L. stylosa以及相关的自交种L. uniflora和L. torulosa，与自交相关的多样性降低非常显著，因为在自交种的种群中未观察到变异体。在L. crassa和L. alabamica中，这种降低较低，但考虑到这种比较是在自交率差异较小的情况下进行的，据估计，L. crassa极端自交种群和异交种群之间的差异大大超过两倍。将这些结果与已发表的关于具有不同自交水平的近缘分类群的研究进行了比较。自交对等位酶多样性的影响始终大于从不相关物种比较中估计的影响。
