Multiple Polyploidization Events across Asteraceae with Two Nested Events in the Early History Revealed by Nuclear Phylogenomics.
Multiple Polyploidization Events across Asteraceae with Two Nested Events in the Early History Revealed by Nuclear Phylogenomics.
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核系统发育学揭示早期历史中菊科的多个多倍化事件和两个嵌套事件
DOI：
10.1093/molbev/msw157
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发表时间：
2016-11
影响因子：
10.7
通讯作者：
Ma H
中科院分区：
文献类型：
--
作者：
Huang CH;Zhang C;Liu M;Hu Y;Gao T;Qi J;Ma H
生物多样性是多种进化机制的结果，包括遗传变异和自然选择。全基因组复制（WGD）或多倍化为大规模遗传修饰提供了机会。许多进化上成功的谱系，包括被子植物和脊椎动物，都是古老的多倍体，这表明WGD是进化的驱动力。然而，这一假设受到了最近形成的多倍体比二倍体更低的物种形成和更高的灭绝率的挑战。菊科植物包括约10%的被子植物物种，因此无疑是最成功的谱系之一，古多倍化在该科早期使用少量数据集提出。在这里，我们使用了来自64个新的转录组数据集和其他数据集的基因来重建一个强大的菊科植物发生学，涵盖了来自6个亚科18个部落的73个物种。我们估计了他们的分歧时间，并进一步确定了多个潜在的古代WGD在几个部落和共享的向日葵联盟，核心菊科（Asteroideae-Mutisioideae），也与姐妹家庭Calyceraceae。对于两个WGD事件，随后有很大的增加，在生物多样性;老一个进行的分歧，至少有10个亚科内10我，在形态和生理上有很大的变化，而另一个其次是极高的物种丰富度Heliantheae联盟分支。我们的研究结果提供了不同的证据，几个WGD在菊科和WGD事件之间的显着关联，环境和物种辐射的剧烈变化，提供了一个可能的方案，多倍体克服WGD的缺点，进化成具有高生物多样性的谱系。
Biodiversity results from multiple evolutionary mechanisms, including genetic variation and natural selection. Whole-genome duplications (WGDs), or polyploidizations, provide opportunities for large-scale genetic modifications. Many evolutionarily successful lineages, including angiosperms and vertebrates, are ancient polyploids, suggesting that WGDs are a driving force in evolution. However, this hypothesis is challenged by the observed lower speciation and higher extinction rates of recently formed polyploids than diploids. Asteraceae includes about 10% of angiosperm species, is thus undoubtedly one of the most successful lineages and paleopolyploidization was suggested early in this family using a small number of datasets. Here, we used genes from 64 new transcriptome datasets and others to reconstruct a robust Asteraceae phylogeny, covering 73 species from 18 tribes in six subfamilies. We estimated their divergence times and further identified multiple potential ancient WGDs within several tribes and shared by the Heliantheae alliance, core Asteraceae (Asteroideae–Mutisioideae), and also with the sister family Calyceraceae. For two of the WGD events, there were subsequent great increases in biodiversity; the older one proceeded the divergence of at least 10 subfamilies within 10 My, with great variation in morphology and physiology, whereas the other was followed by extremely high species richness in the Heliantheae alliance clade. Our results provide different evidence for several WGDs in Asteraceae and reveal distinct association among WGD events, dramatic changes in environment and species radiations, providing a possible scenario for polyploids to overcome the disadvantages of WGDs and to evolve into lineages with high biodiversity.
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影响因子：
4.5
作者：
Chapman MA;Tang S;Draeger D;Nambeesan S;Shaffer H;Barb JG;Knapp SJ;Burke JM
通讯作者：
Burke JM
DOI：
10.1093/bioinformatics/btp348
发表时间：
2009-08-01
期刊：
Bioinformatics (Oxford, England)
影响因子：
--
作者：
Capella-Gutiérrez S;Silla-Martínez JM;Gabaldón T
通讯作者：
Gabaldón T
影响因子：
10.7
作者：
Chapman, Mark A.;Leebens-Mack, James H.;Burke, John M.
通讯作者：
Burke, John M.
影响因子：
9.8
作者：
Dehal P;Boore JL
通讯作者：
Boore JL
影响因子：
10.7
作者：
Cannon, Steven B.;McKain, Michael R.;Leebens-Mack, Jim
通讯作者：
Leebens-Mack, Jim