Molecular phylogeny of the genus Asparagus (Asparagaceae) inferred from plastid petB intron and petD-rpoA intergenic spacer sequences
Molecular phylogeny of the genus Asparagus (Asparagaceae) inferred from plastid petB intron and petD-rpoA intergenic spacer sequences
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DOI：
10.1111/j.1442-1984.2005.00131.x
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发表时间：
2005-08-01
影响因子：
1.4
通讯作者：
Yokoyama, J
中科院分区：
文献类型：
--
作者：
Fukuda, T;Ashizawa, H;Yokoyama, J
芦笋(芦笋科)是一个大属，广泛分布于东半球和亚干旱地区。为了研究该属植物的系统发育关系，测定了叶绿体DNA的PetB内含子和PETD与rpoA之间的间隔区(CpDNA)。根据系统发育分析得出的严格共识树表明，南部非洲物种包括一个潜在的同源组合，欧亚物种是单系物种。这一结果表明芦笋属起源于南部非洲，欧亚物种起源于南部非洲的祖先。此外，对芦笋属植物中trnL和trnF之间的基因间隔区以及cpDNA的trnL内含子的广泛调查表明，尽管非编码区经常用于重建属内系统发育，但没有序列差异。因此，我们推测，该属的快速辐射可能是由于获得了独特的特征，如叶枝，以适应干燥的环境。
Asparagus (Asparagaceae) is a large genus that is widely distributed in and and subarid regions of the Old World. To investigate the phylogenetic relationships within this genus, the intron of petB and the intergenic region between petD and rpoA of chloroplast DNA (cpDNA) were sequenced. A strict consensus tree resulting from the phylogenetic analysis indicates that southern African species comprise a potentially paraphyletic assemblage and that Eurasian species are monophyletic. This result suggests that the genus Asparagus originated in southern Africa, and that Eurasian species originated from a southern African progenitor. Moreover, extensive survey of the intergenic region between trnL and trnF and the intron of trnL of cpDNA in species of the genus Asparagus displayed no sequence differences despite the non-coding regions frequently used to reconstruct intrageneric phylogenies. Therefore, we hypothesized that rapid radiation of this genus might have been influenced by the gaining of unique characteristics, such as phylloclades, in order to adapt to the dry environment.