Cytogeography and meiotic chromosome configurations of six intraspecific aneuploids of Carex conica Boott (Cyperaceae) in Japan

Chromosome numbers were determined for 340 plants of Carex conica from 83 populations in Japan. Six aneuploids, 2n=32, 33, 34, 36, 37 and 38, were found. Plants with even diploid chromosome numbers 2n=32, 34, and 36 were the most common and had different geographical distributions. Individuals with...

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Bibliographic Details
Published in:Journal of Plant Research 1994-06, Vol.107 (1086), p.131-138
Main Authors: Hoshino, T. (Okayama Univ. (Japan). Faculty of Science), Waterway, M.J
Format: Article
Language:English
Subjects:
ANATOMIA DE LA PLANTA
ANATOMIE VEGETALE
ANEUPLOIDIA
ANEUPLOIDIE
CAREX
DISTRIBUCION NATURAL
DISTRIBUTION NATURELLE
ESPECE
ESPECIES
Freshwater
JAPON
MEIOSE
MEIOSIS
NOMBRE CHROMOSOMIQUE
NUMERO DE CROMOSOMAS
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Summary:Chromosome numbers were determined for 340 plants of Carex conica from 83 populations in Japan. Six aneuploids, 2n=32, 33, 34, 36, 37 and 38, were found. Plants with even diploid chromosome numbers 2n=32, 34, and 36 were the most common and had different geographical distributions. Individuals with 2n=32 were from islands in the Seto Inland Sea and nearby coastal areas of the Chugoku District of Honshu; those with 2n=34 were from the Kanto, Chubu and Kinki Districts of Honshu; those with 2n=36 were from the mountainous areas of Chugoku, Shikoku and Kyushu Districts. Canonical discriminant analysis of 17 morphological characters demonstrated that the plants with 2n=32 were clearly distinct from those with 2n=34 or 36. All four aneuploids with even chromosome numbers showed normal bivalent pairing at meiotic metaphase I and probably represent cytogenetically stable cytodemes. Plants with 2n=33 had one heteromorphic trivalent and 15 bivalents, indicating a structural mutation. At mitotic metaphase I, one chromosome was markedly larger than the others, suggesting that the 2n=33 plants arose from 2n=34 plants by fusion of two chromosomes. The plant with 2n=37 was intermediate in morphology between Carex conica (2n=36) and C. morrowii (2n=38) and probably originated as an interspecific hybrid between these species
ISSN:0918-9440
1618-0860