Origin area and migration route： Chloroplast DNA diversity in the arctic-alpine plant Koenigia islandica

The Hengduan Mountains（henceforth H-D Mountains） on the Tibet Plateau are a distribution and diversity center for many alpine genera. We examine patterns of genetic variation in an arctic-alpine plant to evaluate the possibility that the H-D Mountains constitute the area of origin of the species as...

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Bibliographic Details
Published in:Science China. Earth sciences 2014-08, Vol.57 (8), p.1760-1770
Main Authors: Long, Cong, Min, YunJiang, Zhao, XiuXia, Yany, ChunLei, Sun, Hang, Lü, HouYuan, Tang, LingYu, Zhou, ZhongZe
Format: Article
Language:English
Subjects:
Chloroplasts
Deoxyribonucleic acid
DNA
Earth and Environmental Science
Earth Sciences
Flowers & plants
Genetic diversity
Geographical distribution
Geology
Haplotypes
Koenigia islandica
Mountains
Phylogeography
Refugia
Research Paper
Species diversity
叶绿体DNA
喜马拉雅山脉
横断山脉
物种多样性
迁移路线
遗传多样性
面积
高寒植物
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Summary:The Hengduan Mountains（henceforth H-D Mountains） on the Tibet Plateau are a distribution and diversity center for many alpine genera. We examine patterns of genetic variation in an arctic-alpine plant to evaluate the possibility that the H-D Mountains constitute the area of origin of the species as well as to uncover postglacial migration routes. 220 individuals of the arctic-alpine plant Koenigia islandica were sampled from 26 populations distributed in western China and northern Finland. DNA haplotypes were identified using restriction site analysis of two chloroplast DNA intergene spacer regions, atpB-rbcL and trnL-trnF. We examined the geographical distribution of haplotype diversity in relation to latitude, and also compared various indices of diversity in putatively glaciated and unglaciated regions. Patterns of migration were inferred using nested clade analysis. A total of 25 haplotypes were detected. High haplotype diversity was found in the H-D Mountains. H3 and its radiated haplotypes were distributed in the Himalayas. Two haplotypes were fixed concurrently in the H-D Mountains and northern Finland. High genetic diversity of K. islandica and high species diversity of K. islandica are expected in the origin area. Our observations suggest that the H-D Mountains are not only the place of origin of K. islandica, but also the refugia for K. islandica on the Tibet Plateau. What is more, the migration route for the arctic-alpine plant K. islandica must have originated in the region defined by the H-D Mountains in western China extending northward to the Arctic circumpolar, and moved westward along the Himalayas, then northward across the Altay Mountains and the Central Siberian Plateau at different time periods.
ISSN:1674-7313
1869-1897
DOI:10.1007/s11430-014-4819-2