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Cytological studies on meiotic configurations of intraspecific aneuploids ofCarex blepharicarpa (Cyperaceae) in Japan

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Abstract

Chromosome configurations at meiotic metaphase I ofCarex blepharicarpa were determined for 245 individuals collected from 11 localities in the Chugoku District of Japan. Nine intraspecific aneuploids, 2n=26–33 and 41, were found. The most common diploid number was 29, and found in 73 individuals. No clear geographical pattern was suggested by a distribution of these aneuploids. A consecutive series of chromosome numbers from 2n=26 to 32 was found in two populations from Okayama Prefecture. At meiotic metaphase I, univalents and multivalents were found, and one to three trivalents were observed in each aneuploid. Heteromorphic chain trivalents comprising large, medium and small chromosomes were prevalent. Homomorphic trivalents, which are thought to be originated from chromosome duplications caused by unreduced gametes, were found in only one individual with 2n=41. The high frequency of heteromorphic trivalents in this species indicates that most aneuploidy probably results from fission and/or fusion of chromosomes.

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Authors and Affiliations

  1. Biological Laboratory, Faculty of Science, Okayama University of Science, 700, Okayama, Japan

    Takuji Hoshino & Kazutoshi Okamura

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  1. Takuji Hoshino
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  2. Kazutoshi Okamura
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Hoshino, T., Okamura, K. Cytological studies on meiotic configurations of intraspecific aneuploids ofCarex blepharicarpa (Cyperaceae) in Japan. J. Plant Res. 107, 1–8 (1994). https://doi.org/10.1007/BF02344523

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  • DOI: https://doi.org/10.1007/BF02344523

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