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Plant Systematics and Evolution

, Volume 298, Issue 5, pp 985–996 | Cite as

Recent origin and adaptive diversification of Ainsliaea (Asteraceae) in the Ryukyu Islands: molecular phylogenetic inference using nuclear microsatellite markers

  • Yuki Mitsui
  • Hiroaki Setoguchi
Original Article

Abstract

We investigated the phylogeny and phylogeography of four closely related Ainsliaea species (Asteraceae) on the continental Ryukyu Islands of eastern Asia, which consist of two flood-adapted “rheophyte” and two non-rheophyte (inland) species, based on 12 nuclear microsatellite loci. Phylogenetic analyses using 420 individuals from 26 populations showed that rheophytic A. linearis and A. oblonga are genetically distinct. Each species was clustered with the inland species that occur on the same islands, suggesting a different ancestry for the two rheophytes that evolved independently by local adaptation to flooded habitats. The results from the neighbor-joining clustering and principal coordinate analysis (PCoA) indicate that the southern populations of A. macroclinidioides are distinct lineages and ancestral to the northern populations as well as the other diverse species complex in the Ryukyus. These results suggest a pattern of colonization initially from the Asian mainland to the southern islands, followed by the northern islands via land bridges generated during the Quaternary glaciations. After isolation from southern populations, species radiation and regional differentiation within the northern clade occurred possibly via local adaptation and/or geographic isolation of the subdivided island bridge.

Keywords

Adaptation Ainsliaea Microsatellites Phylogeny Rheophytes Ryukyu Islands 

Notes

Acknowledgments

We thank Dr. Tomoko Fukuda (National Museum of Science and Nature, Tokyo, Japan), Mr. Yoshiyuki Maeda (Hookaen Nursery), Dr. Ching-I. Peng and Mr. Chien-I. Huang (Academia Sinica, Taiwan), and Dr. Yun-Fei Deng (Herbarium South China Botanical Garden) for helping to collect plant samples. This study was supported by a Grant-in-Aid for Scientific Research (#21370036) from the Ministry of Education, Culture, Science, Sports and Technology, Japan.

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  1. 1.Faculty of AgricultureTokyo University of AgricultureAtsugiJapan
  2. 2.Graduate School of Human and Environmental StudiesKyoto UniversityKyotoJapan

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