The botanical magazine = Shokubutsu-gaku-zasshi

, Volume 105, Issue 4, pp 639–648 | Cite as

Cytogeographical study of four aneuploids ofCarex oxyandra Kudo in Japan

  • Takuji Hoshino
Article
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Accepted:

Abstract

Chromosome numbers were determined for 342 clones ofCarex oxyandra collected from 35 localities in Hokkaido, Honshu, Shikoku and Kyushu, Japan. Four intraspecific aneuploids, 2n=18, 20, 24 and 26, were found. In meiotic division, only bivalent chromosomes were observed in all clones at metaphases I and II, suggesting that the aneuploids are established gamodemes. In the mitotic metaphase chromosomes, trimodal variation in chromosome length was observed. The 2n=26 clones found on Mt. Hiko had two particularly small chromosomes. The cytodemes with higher number of chromosomes are distributed in more southern areas of Japan.Carex oxyandra, therefore, accompanied with chromosome fragmentations, might spread the geographical distribution to the southern parts. The morphological characters of leaves, spikes, scales, perigynia and nuts were similar among the four cytodemes, except for the small leaves on plants from Yaku Island.

Key words

Carex oxyandra Geographical distribution Intraspecific aneuploid Chromosome fragmentation 
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Copyright information

© The Botanical Society of Japan 1992

Authors and Affiliations

  • Takuji Hoshino
    • 1
  1. 1.Biological Laboratory, Faculty of ScienceOkayama University of ScienceOkayamaJapan

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