Allozyme diversity in Leavenworthia populations with different inbreeding levels
Allozyme diversity in Leavenworthia populations with different inbreeding levels
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DOI：
10.1046/j.1365-2540.1998.00415.x
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发表时间：
1998-10-01
期刊：
影响因子：
3.8
通讯作者：
Yang, Z
中科院分区：
文献类型：
--
作者：
Charlesworth, D;Yang, Z
对五种一年生植物利文沃斯的等位酶多样性水平进行了研究。种群的繁育系统也以自交结实和自交结实的措施为特征。按这些标准显示近亲繁殖较多的群体也倾向于具有较低的群体内基因多样性(H-S)值，但在所研究的四组近交系群体中，有两组存在相当大的等位酶变异。与异交的柱花草和近缘近交种Uniflora和Torulosa相比，近交的多样性下降很大，因为在近交者的群体中没有发现变异。粗毛落叶松和阿拉巴马落叶松的降幅较小，但纠正了这种比较超过了不太极端的自交率差异的事实，估计粗毛落叶松极端近交和异交群体之间的差异相当大地超过了两倍。这些结果与在不同近亲繁殖水平的密切相关的分类群中发表的研究进行了比较。近亲交配对等位酶多样性的影响一直比从不相关物种的比较中估计的要大。
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 (H-s) 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 thats has been estimated from comparisons of unrelated species.