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

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

Research output: Contribution to journalArticle

19 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

Fingerprint

Polyploidy
Far East
East Asia
hexaploidy
Chloroplast DNA
phylogenetics
endemic species
polyploidy
Tetraploidy
phylogeny
indigenous species
Ribosomal DNA
Taiwan
Introns
autopolyploidy
Ecosystem
DNA
allopolyploidy
chloroplast DNA
chloroplast

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

Cite this

Speciation pathway of Isoë tes (Isoëtaceae) in East Asia inferred from molecular phylogenetic relationships. / Kim, Changkyun; Shin, Hyunchur; Chang, Yung Ta; Choi, Hong Keun.

In: American Journal of Botany, Vol. 97, No. 6, 01.06.2010, p. 958-969.

Research output: Contribution to journalArticle

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abstract = "Polyploidy plays an important role in the speciation of Iso{\"e}tes. 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 {\"e} 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 Iso{\"e}tes. Furthermore, I. taiwanensis, an endemic species in Taiwan, has been involved in at least three cases of autopolyploid or allopolyploid speciation in East Asia.",
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