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Journal of Plant Research

, 111:509 | Cite as

Cytology and systematics in JapaneseArisaema (Araceae)

  • Kuniaki WatanabeEmail author
  • Tomiki Kobayashi
  • Jin Murata
Original Articles
  • 108 Downloads

Abstract

Chromosome numbers are determined from 37 populations attributed to 22 taxa of JapaneseArisaema. Of them, chromosome numbers ofA. limbatum var.conspicuum (2n=26),A. minus (2n=26),A. nambae (2n=28) andA. seppikoense (2n=26) are determined for the first time. New chromosome numbers, 2n=26, are reported forA. aequinoctiale, A. limbatum, A. stenophyllum, A. undulatifolium andA. yoshinagae. Three modes of basic chromosome numbers,x=14,x=13 andx=12, occur in JapaneseArisaema. Precise karyotypic comparisons of 20 taxa reveal that taxa withx=14 andx=13 share 26 major chromosome arms and have an obvious chromosomal relationship. One of two submeta-centric chromosomes inx=13 corresponds to two telo-centric chromosomes inx=14. InA. ternatipartitum with 2n=6x=72, ten out of 12 basic chromosomes are the most similar in size and arm ratio with larger ten chromosomes ofA. ringens among JapaneseArisaema examined. A basic chromosome number ofx=14 is the commonest in the genusArisaema and the remaining basic chromosome numbers,x=13 andx=12, seem to be derived through dysploidal reduction by translocating large segments of major arm of telo-centric chromosome onto other minor arm of telo-centric followed by loss of the remainings including a centromere, and by loss of two telo-centrics fromx=14, respectively. Some systematic problems of JapaneseArisaema are discussed based on new cytological data.Arisaema hatizyoense, A. minus andA. nambae are accepted as independent species.

Key words

Araceae Arisaema Chromosome number Dysploidy Karyotype Telo-centrics 

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Copyright information

© The Botanical Society of Japan 1998

Authors and Affiliations

  • Kuniaki Watanabe
    • 1
    Email author
  • Tomiki Kobayashi
    • 2
  • Jin Murata
    • 3
  1. 1.Department of Biology, Faculty of ScienceKobe UniversityKobeJapan
  2. 2.The Hyogo Prefectural Institute of Environmental ScienceKobeJapan
  3. 3.Makino Herbarium, Faculty of ScienceTokyo Metropolitan UniversityTokyoJapan

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