Phylogeny and biogeographic diversification of Maianthemum (Ruscaceae: Polygonatae).
Phylogeny and biogeographic diversification of Maianthemum (Ruscaceae: Polygonatae).
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DOI：
10.1016/j.ympev.2008.07.017
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发表时间：
2008-11
影响因子：
4.1
通讯作者：
Y. Meng;J. Wen;Z. Nie;Hang Sun;Yongpeng Yang
中科院分区：
文献类型：
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作者：
Y. Meng;J. Wen;Z. Nie;Hang Sun;Yongpeng Yang
蔷薇属（Ruscaceae）包括28-38个物种，并且包括两个传统上公认的属：严格意义上的蔷薇属（Maibiumsensustricto）和鹿药属（Smilacina）。对来自22个种的37个样品和6个近缘外类群的8个叶绿体和核标记（trnL-F、rps 16、rpl 16、psbA-trnH、rbcL、ndhF、trnK和ITS）进行了测序，总长度近10，000个碱基对。系统发育分析表明，猪笼草属与狭叶猪笼草属在鹿药子属内是单系的。除塔前麦娘和塔前麦娘外，中国西南喜马拉雅东部地区几乎所有的种都有分布。stenolobum形成一个支持良好的分支。这支的特征是形态上的短花丝和大花药，相对大的花，和短柔毛茎和叶。大津麦娘（M. tatsienense）和大津麦娘（M. stenolobum从西南到华中形成另一个分支。来自东亚（中国东北部和日本中部）和新大陆的其他种分为几个分支。东亚和北美在严格意义上的大陆分离估计在168万年前（mya），贝叶斯松弛时钟依赖于不相关的速率。中国西南部高山地区存在一个约2.04百万年的现代辐射，这与喜马拉雅山隆升后该地区的地理异质性相对应。鸟类的远距离传播可能促进了中国西南地区鸟类的洲际间断分布和地理多样性的演化。
Maianthemum (Ruscaceae) comprises 28–38 species and includes the two traditionally recognized genera: Maianthemum sensu stricto and Smilacina. Thirty-seven samples representing 22 species of Maianthemum and six closely related outgroup taxa were sequenced for eight chloroplast and nuclear markers (trnL-F, rps16, rpl16, psbA-trnH, rbcL, ndhF, trnK, and ITS) with a total length of nearly 10,000 base pairs. Phylogenetic analyses supported the monophyly of Maianthemum with Maianthemum sensu stricto nested within Smilacina. Almost all species from the eastern Himalayan region in SW China except for Maianthemum tatsienense and M. stenolobum form a well supported clade. This clade is characterized morphologically by short filaments and large anthers, relatively large flowers, and pubescent stems and leaves. Maianthemum tatsienense and M. stenolobum from SW to central China form another clade. The other species from eastern Asia (central to NE China and Japan) and the New World fall into several clades. The intercontinental disjunction between eastern Asia and North America in Maianthemum sensu stricto is estimated to be at 1.68 million years ago (mya) with the Bayesian relaxed clock relying on uncorrelated rates. A recent radiation at about 2.04mya is suggested in the high mountains of SW China, corresponding to the geographical heterogeneity in that region after the uplift of the Himalayas. Long distance dispersal by birds may have facilitated the evolution of their intercontinental disjunction and their biogeographic diversifications in SW China.