Speciation pathway of Isoë tes (Isoëtaceae) in East Asia inferred from molecular phylogenetic relationships

Changkyun Kim, Hyunchur Shin, Yung Ta Chang, Hong Keun Choi

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21 Citations (Scopus)

Abstract

Polyploidy plays an important role in the speciation of Isoëtes. Increasing our knowledge about the specifi c origin of each polyploid or phylogenetic relationship among species has been hampered because of conserved morphological variation and scarce habitats. We present several hypotheses concerning the speciation pathways of Iso ë tes species distributed in East Asia. Our hypotheses are inferred from phylogenetic relationships that were elucidated using sequences of the internal transcribed spacer regions of nuclear ribosomal DNA, a second intron of LEAFY, and chloroplast DNA trnS-psbC spacer regions. These inferred phylogenetic relationships indicated that (1) the Chinese tetraploid, I. sinensis, is closely related to I. yunguiensis; (2) the Korean endemic species, I. hallasanensis, is an autotetraploid derived from I. taiwanensis or closely related taxa; (3) the hexaploid I. coreana forms a clade and has its closest evolutionary relationships with I. taiwanensis or I. hallasanensis; and (4) the Japanese hexaploid I. japonica is closely related to I. taiwanensis-I. coreana and I. sinensis-I. yunguiensis. These results suggest that interspecifi c hybridization and polyploidization have played central roles in speciation of East Asian Isoëtes. Furthermore, I. taiwanensis, an endemic species in Taiwan, has been involved in at least three cases of autopolyploid or allopolyploid speciation in East Asia.

Original languageEnglish
Pages (from-to)958-969
Number of pages12
JournalAmerican Journal of Botany
Volume97
Issue number6
DOIs
Publication statusPublished - 2010 Jun 1

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Keywords

  • Allopolyploid
  • Autopolyploid
  • Chloroplast DNA trnS-psbC
  • East Asia
  • Iso ëtes
  • Isoëtaceae
  • LEAFY
  • NrITS
  • Phylogenetic relationship

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Genetics
  • Plant Science

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