Genetic diversity and structure in two species of Leavenworthia with self-incompatible and self-compatible populations.
Genetic diversity and structure in two species of Leavenworthia with self-incompatible and self-compatible populations.
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DOI：
10.1038/hdy.2010.59
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发表时间：
2011-02
期刊：
影响因子：
3.8
通讯作者：
Mauricio, R.
中科院分区：
文献类型：
--
作者：
Koelling, V. A.;Hamrick, J. L.;Mauricio, R.
自体受精是植物中常见的交配系统，已知会减少遗传多样性，增加遗传结构，并可能使种群面临更大的灭绝风险。在这项研究中，我们测量了两种雪松林间空地特有物种：Leavenworthia alabamica 和 L. crassa 的遗传多样性和结构。这些物种具有自交不亲和（SI）和自交亲和（SC）种群，因此非常适合了解交配系统如何影响遗传多样性和结构。我们发现 L. alabamica 和 L. crassa 具有较高的物种水平遗传多样性（He 分别为 0.229 和 0.183）和较高的种群间遗传结构（FST 分别为 0.45 和 0.36），但 SC 的平均遗传多样性显着低于 SI 种群（SC vs. SI，L. alabamica 的 He 为 0.065 vs. 0.206，L. crassa 的 He 为 0.065 vs. 0.206）为 0.084 与 0.189）。我们还使用最大似然聚类方法发现了重要的遗传结构。这些数据表明，SI 的丧失导致种群内遗传多样性的丧失。此外，我们还检查了 SI 和 SC 种群之间的遗传距离关系，以调查可能的种群历史和自交亲和性的起源。我们发现 L. alabamica 和 L. crassa 的自交亲和性可能有多个起源。然而，还需要进一步的工作来检验这一假设。最后，考虑到它们的高遗传结构以及个体种群拥有独特的等位基因，寻求最大限度地提高这些或类似物种的物种水平遗传多样性的保护策略应该保护多个种群。
Self-fertilization is a common mating system in plants and is known to reduce genetic diversity, increase genetic structure, and potentially put populations at greater risk of extinction. In this study, we measured the genetic diversity and structure of two cedar glade endemic species, Leavenworthia alabamica and L. crassa. These species have self-incompatible (SI) and self-compatible (SC) populations and are therefore ideal for understanding how the mating system affects genetic diversity and structure. We found that L. alabamica and L. crassa had high species-level genetic diversity (He=0.229 and 0.183 respectively) and high genetic structure among their populations (FST=0.45 and 0.36 respectively), but that mean genetic diversity was significantly lower in SC compared to SI populations (SC vs. SI, He for L. alabamica was 0.065 vs. 0.206 and for L. crassa was 0.084 vs. 0.189). We also found significant genetic structure using maximum-likelihood clustering methods. These data indicate that the loss of SI leads to the loss of genetic diversity within populations. In addition, we examined genetic distance relationships between SI and SC populations to investigate possible population history and origins of self-compatibility. We find there may have been multiple origins of self-compatibility in L. alabamica and L. crassa. However, further work is required to test this hypothesis. Finally, given their high genetic structure and that individual populations harbor unique alleles, conservation strategies seeking to maximize species-level genetic diversity for these or similar species should protect multiple populations.
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影响因子：
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