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首页> 外文期刊>The Royal Society Proceedings B: Biological Sciences >Genetic diversity in Leavenworthia populations with different inbreeding levels.
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Genetic diversity in Leavenworthia populations with different inbreeding levels.

机译：不同近交水平的Leavenworthia种群的遗传多样性。

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摘要

Levels of neutral genetic diversity within and between populations were compared between outcrossing (self-incompatible) and inbreeding populations in the annual plant genus Leavenworthia. Two taxonomically independent comparisons are possible, since self-incompatibility has been lost twice in the group of species studied. Within inbred populations of L.uniflora and L.crassa, no DNA sequence variants were seen among the alleles sampled, but high diversity was seen in alleles from populations of the outcrosser L. stylosa, and in self-incompatible L. crassa populations. Diversity between populations was seen in all species. Although total diversity values were lower in the sets of inbreeding populations, between-population values were as high or higher, than those in the outcrossing taxa. Possible reasons for these diversity patterns are discussed. As the effect of inbreeding appears to be a greater than twofold reduction in diversity, we argue that some process such as selection for advantageous mutations, or against deleterious mutations, or bottlenecks occurring predominantly in the inbreeders, appears necessary to account for the findings. If selection for advantageous mutations is responsible, it appears that it must be some form of local adaptive selection, rather than substitution of alleles that are advantageous throughout the species. This is consistent with the finding of high between-population diversity in the inbreeding taxa.
机译：在一年生植物Levenworthia的异交（自交不亲和）和近交种群之间比较了种群内部和种群之间的中性遗传多样性水平。两种分类学上独立的比较是可能的，因为在研究的物种组中自我不相容性已经丧失了两次。在L.uniflora和L.crassa的近交种群中，未在采样的等位基因中发现DNA序列变异，但在异交钉线虫L. stylosa种群和自身不相容的L. crassa种群中发现了高度多样性。在所有物种中都可以看到种群之间的多样性。尽管近交种群中的总多样性值较低，但种群间的值与异类群中的种群之间的值一样高或更高。讨论了这些多样性模式的可能原因。由于近亲繁殖的影响似乎是多样性减少的两倍以上，因此我们认为某些过程（如选择有利的突变或针对有害突变或近亲繁殖的瓶颈）似乎是解释这一发现所必需的。如果选择有利的突变是负责任的，那么看来它必须是某种形式的局部适应性选择，而不是替代对整个物种有利的等位基因。这与近交分类群中种群间多样性高的发现是一致的。

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