Population Genomics in Wild Tomatoes-The Interplay of Divergence and Admixture.
Population Genomics in Wild Tomatoes-The Interplay of Divergence and Admixture.
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DOI：
10.1093/gbe/evx224
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发表时间：
2017-11-01
影响因子：
3.3
通讯作者：
Rose LE
中科院分区：
文献类型：
--
作者：
Beddows I;Reddy A;Kloesges T;Rose LE
近缘植物物种间的杂交现象很普遍，但杂交的结果尚不完全清楚。本文研究了野生番茄分支（茄科）的系统发育关系和杂交历史。我们对来自38个不同种群的个体的RNA进行了测序，并将其与已发表的数据相结合，建立了整个进化支系的全面基因组数据集。数据表明，许多分类群不是单系的，许多个体由于重复杂交而杂交。最具多态性的种秘鲁茄（Solanum peruvium）有两个遗传和地理亚种群，而其姊妹种智利茄（Solanum chilense）则有明显的沿海种群，杂合度降低，表明该物种在大约1.25 Ma时从秘鲁茄形成后向南扩展。72°以西的不连续种群目前被描述为智利葡萄球菌，但在遗传上介于智利葡萄球菌和秘鲁葡萄球菌之间。基于分子、形态和交叉数据，我们验证了这些不连续的“S”。Chilense种群是重组物种形成的一个例子。重组物种形成很少被报道，我们讨论了识别它和区分不同人口情景的困难。这一发现为了解植物杂交的基因组结果提供了新的机会。
Hybridization between closely related plant species is widespread, but the outcomes of hybridization are not fully understood. This study investigates phylogenetic relationships and the history of hybridization in the wild tomato clade (Solanum sect. Lycopersicon). We sequenced RNA from individuals of 38 different populations and, by combining this with published data, build a comprehensive genomic data set for the entire clade. The data indicate that many taxa are not monophyletic and many individuals are admixed due to repeated hybridization. The most polymorphic species, Solanum peruvianum, has two genetic and geographical subpopulations, while its sister species, Solanum chilense, has distinct coastal populations and reduced heterozygosity indicating a recent expansion south following speciation from S. peruvianum circa 1.25 Ma. Discontinuous populations west of 72° are currently described as S. chilense, but are genetically intermediate between S. chilense and S. peruvianum. Based upon molecular, morphological, and crossing data, we test the hypothesis that these discontinuous “S. chilense” populations are an example of recombinational speciation. Recombinational speciation is rarely reported, and we discuss the difficulties in identifying it and differentiating between alternative demographic scenarios. This discovery presents a new opportunity to understand the genomic outcomes of hybridization in plants.
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影响因子：
4.5
作者：
Gutenkunst RN;Hernandez RD;Williamson SH;Bustamante CD
通讯作者：
Bustamante CD
影响因子：
1.7
作者：
Anderson, L. K.;Covey, P. A.;Stack, S. M.
通讯作者：
Stack, S. M.
影响因子：
56.9
作者：
EHRLICH, PR;RAVEN, PH
通讯作者：
RAVEN, PH
影响因子：
7.2
作者：
Aflitos, Saulo;Schijlen, Elio;Peters, Sander
通讯作者：
Peters, Sander
影响因子：
56.9
作者：
GRANT, PR;GRANT, BR
通讯作者：
GRANT, BR