Biosystematic Studies on the Family Tofieldiaceae II. : Phylogeny of Species of Tofieldia and Triantha Inferred from Plastid and Nuclear DNA Sequences

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概要

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• Using plastid trnK, trnL and trnL-F sequences and nuclear ITS sequences (4558 bp in total) from 32 individuals of 13 species, we conducted a combined analysis to clarify phylogenetic relationships of the species of Tofieldia and Triantha and to discover new taxonomic characters. According to strict consensus of 45 most parsimonious trees, the two genera are monophyletic with 100% bootstrap support. In Tofieldia, three robust clades (100%) are formed: (1) To. coccinea, To. nuda, To. divergens, To. yunnanensis and To. thibetica, (2) To. calyculata, and (3) To. okuboi, To. glahra and To. pusilla. The species of the clade 3 are primarily characterized by a broad and sharply bent leaf apex as in some species of Triantha. In clade 1, the Chinese species of To. divergens, To. yunnanensis and To. thibetica are grouped (100%). They share long needle-like or hair-like processes on the leaf margin. In Triantha, two clades are formed: (1) Tr. japonica, Tr. occidentalis and Tr. glutinosa from the USA (76%), and (2) Tr. racemosa and Tr. glutinosa from Canada (91%). This might suggest that Tr. glutinosa is the assemblage retaining ancestral character states of Triantha and should be divided at least into two species in the future treatments.

• 2010-03-30

著者

• TAMURA MINORU

  Department of Botany, Graduate School of Science, Kyoto University

• AZUMA HIROSHI

  Department of Botany, Graduate School of Science, Kyoto University

• YAMASHITA JUN

  Research Institute for Bioresources, Okayama University

• FUSE SHIZUKA

  Museum of Nature and Human Activities

• ISHII TAKAAKI

  Botanical Gardens, Graduate School of Science, Osaka City University

• Ishii Takaaki

  Botanical Gardens Graduate School Of Science Osaka City University

• Azuma Hiroshi

  Department Of Botany Graduate School Of Science Kyoto University

• Yamashita Jun

  Research Institute For Bioresources Okayama University

• Tamura Minoru

  Kyoto Univ. Kyoto Jpn

• Yamashita J

  Research Institute For Bioresources Okayama University

• Tamura Minoru

  Department Of Botany Graduate School Of Science Kyoto University

• Azuma Hiroshi

  Department Of Biosystem Regulation Institute Of Biomaterials And Bioengineering

• Tamura Minoru

  Department Of Applied Chemistry Faculty Of Engineering Ehime University

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