Phylogeography of a marsh herb Sagittaria trifolia (Alismataceae) in China inferred from cpDNA atpB-rbcL intergenic spacers
Phylogeography of a marsh herb Sagittaria trifolia (Alismataceae) in China inferred from cpDNA atpB-rbcL intergenic spacers
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DOI：
10.1016/j.ympev.2008.03.008
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发表时间：
2008-07-01
影响因子：
4.1
通讯作者：
Motley, Timothy J.
中科院分区：
文献类型：
--
作者：
Chen, Jin-Ming;Liu, Fan;Motley, Timothy J.
慈姑是一种多年生直立草本植物，仅限于池塘、稻田、沟渠和淡水湿地。利用叶绿体DNA atpB-rbcL基因间隔区序列，研究了中国南方红豆杉的地理分布和种群历史。trifolia的42个居群的108个样本代表了中国的整个地理分布。27个单倍型的特点，其中两个是广泛分布在人群中。在最小跨度网络中，所有尖端单倍型都是特定群体所特有的，而内部节点则代表广泛分布的单倍型。cpDNA单倍型的巢式进化枝分析（NCA）表明，长距离扩散是冰后期南方古猿进化的主要特征。三叶草在中国。没有具体的避难所地区的建议，因为遗传分化是低的采样区域和区域内的人口，虽然大量的单倍型是唯一的一个单一的人口。目前的数据支持，在个别群体中的独特的单倍型最有可能代表最近的突变衍生物后，长距离传播，而不是在避难所的遗物。这些结果为S. trifolia是首次对中国一种广泛分布的沼泽草本植物进行地理学分析，并支持了植物在冰后期迁徙过程中长距离扩散事件的重要性。(C)2008年由Elsevier Inc.出版
Sagittaria trifolia L. is a perennial, erect herb that is confined to ponds, rice fields, ditches, and freshwater wetlands. Using chloroplast DNA (cpDNA) atpB-rbcL intergenic spacer sequences, we studied the phylogeographic pattern and demographic history of S. trifolia with 108 samples from 42 populations representing the entire geographic range in China. Twenty-seven haplotypes were characterized and two of them were widely distributed in the populations. In the minimum-spanning network, all tip haplotypes were unique to a particular population, while the interior nodes represented widespread haplotypes. Nested clade analysis (NCA) of cpDNA haplotypes indicated that long distance dispersal characterized the post-glacial recolonization of S. trifolia in China. No specific refugia areas were suggested because genetic differentiation was low among the sampled regions and among populations within regions although a large number of the haplotypes were unique to a single population. The present data support that the unique haplotypes in individual population most likely represent recent mutational derivatives after long distance dispersal rather than the relics in refugia. These results for S. trifolia represent the first phylogeographic analysis of a widespread marsh herb in China and support the importance of long distance dispersal events in the post-glacial migrations of plants. (C) 2008 Published by Elsevier Inc.