Comprehensive phylogenetic analyses of the Ruppia maritima complex focusing on taxa from the Mediterranean

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• 作者：Yu Ito (1) (2)
  Tetsuo Ohi-Toma (3)
  Jin Murata (3)
  Norio Tanaka (4)
  
• 关键词：Chloroplast capture ; Hybridization ; ITS ; PhyB ; Plastid DNA ; Ruppia
• 刊名：Journal of Plant Research
• 出版年：2013
• 出版时间：November 2013
• 年：2013
• 卷：126
• 期：6
• 页码：753-762
• 全文大小：
• 作者单位：Yu Ito (1) (2)
  Tetsuo Ohi-Toma (3)
  Jin Murata (3)
  Norio Tanaka (4)
  
  1. Department of Biology, University of Saskatchewan, 112 Science Pl., Saskatoon, S7N 5E2, Canada
  2. School of Biological Sciences, University of Canterbury, Private Bag 4800, Christchurch, 8020, New Zealand
  3. Botanical Gardens, Graduate School of Science, The University of Tokyo, 3-7-1 Hakusan, Bunkyo-ku, Tokyo, 112-0001, Japan
  4. Tsukuba Botanical Garden, National Museum of Nature and Science, 4-1-1 Amakubo, Tsukuba, 305-0005, Japan
  
• ISSN：1618-0860

文摘

Recent molecular phylogenetic studies reported high diversity of Ruppia species in the Mediterranean. Multiple taxa, including apparent endemics, are known from that region, however, they have thus far not been exposed to phylogenetic analyses aimed at studying their relationships to taxa from other parts of the world. Here we present a comprehensive phylogenetic analyses of the R. maritima complex using data sets composed of DNA sequences of the plastid genome, the multi-copy nuclear ITS region, and the low-copy nuclear phyB gene with a primary focus on the Mediterranean representatives of the complex. As a result, a new lineage, “Drepanensis”, was identified as the seventh entity of the complex. This lineage is endemic to the Mediterranean. The accessions included in the former “Tetraploid” entity were reclassified into two entities: an Asia–Australia–Europe disjunct “Tetraploid_α” with a paternal “Diploid” origin, and a European “Tetraploid_γ” originating from a maternal “Drepanensis” lineage. Another entity, “Tetraploid_β”, is likely to have been originated as a result of chloroplast capture through backcrossing hybridization between paternal “Tetraploid_α” and maternal “Tetraploid_γ”. Additional discovery of multiple tetraploidizations as well as hybridization and chloroplast capture at the tetraploid level indicated that hybridization has been a significant factor in the diversification of Ruppia.