Phylogeny of PgiC gene in Shorea and its closely related genera (Dipterocarpaceae), the dominant trees in southeast Asian tropical rain forests
Phylogeny of PgiC gene in Shorea and its closely related genera (Dipterocarpaceae), the dominant trees in southeast Asian tropical rain forests
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DOI：
10.3732/ajb.92.5.775
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发表时间：
2005-05-01
影响因子：
3
通讯作者：
Ashton, PS
中科院分区：
文献类型：
--
作者：
Kamiya, K;Harada, K;Ashton, PS
龙脑香科主导东南亚热带雨林的树木由许多具有经济和生态重要性的物种组成。我们测定了Shorea，Hopea，Neobalanocarpus的PgiC基因的部分序列。和Parashorea，以阐明这些属之间的系统发育关系，这一直被认为是相互关联的。这些序列生成的基因树比以前的cpDNA树具有更好的分辨率。PgiC树基本上与cpDNA树一致，除了Neobalanocarpus的位置。PgiC树显示，Neobalanocarpus是嵌套在白色Meranti的Shorea，而本属形成一个分支与Hopea在cpDNA树。这种冲突表明，Neobalanocarpus是通过杂交之间的白色Meranti的Shorea和霍普亚。属于三个木材组（黄色Meranti，Balau和红色Meranti）中的每一个的物种都是单系的。它们一起形成了一个单系分支，与白色梅兰蒂不同。在红Meranti的植物学部分似乎不是单系的。在红默兰蒂中发现了大量的物种间共享的多态性和相应的缺乏种内单倍型的单系性。这种现象的潜在原因，包括祖先多态性的持续存在和通过种间杂交的基因流动。讨论了
Dipterocarpaceae. trees that dominate tropical rain forests in Southeast Asia consist of many economically and ecologically important species. We determined partial sequences of the PgiC gene from species of Shorea, Hopea, Neobalanocarpus. and Parashorea to elucidate phylogenetic relationships among the species of these genera, which have been regarded as interrelated. The sequences generated a gene tree with better resolution than previous cpDNA trees. The PgiC tree is essentially consistent with cpDNA trees, except for the placement of Neobalanocarpus. The PgiC tree shows that Neobalanocarpus is nested within White Meranti of Shorea, whereas this genus forms a clade with Hopea in cpDNA trees. This conflict suggests that Neobalanocarpus is derived via hybridization between White Meranti of Shorea and Hopea. Species belonging to each of three timber groups (Yellow Meranti, Balau, and Red Meranti) within Shorea are monophyletic. Together they form a monophyletic clade distinct from White Meranti. Botanical sections within Red Meranti appear not to be monophyletic. An extensive number of shared polymorphisms among species and consequential lack of monophyly of intraspecific haplotypes are found in Red Meranti. Potential causes of this phenomenon, including persistence of ancestral polymorphisms and gene flow via interspecific hybridization. are discussed.