The Biology of Allium monanthum (Liliaceae) : I. Polyploid Complex and Variations in Karyotype
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概要
- 論文の詳細を見る
Plants of Allium monanthum Maxim., whose gender expression are usually dioecious, but rarely hermaphrodite or gynomonoecious, proved to constitute a polyploid complex, consisting of diploid, triploid, and tetraploid individuals. The basic chromosome complement of this species consists of seven metacentric or submetacentric chromosomes and one acrocentric, the latter possessing a satellite on the short arm. Thus, the karyotype formula is expressed as 7V+1I (x=8). The diploid plants (2n=16) were confined to central Honshu, Japan. Typical female plants possessed the standard karyotype, whereas male plants were heterozygous for two kinds of translocations. The 3x plants (2n=24) are somewhat widely distributed in the areas from the Kanto to Hokuriku district in Honshu. All female triploid plants possessed the standard karyotype. The geographical distribution of 4x plants (2n=32) which express mostly a female phenotype occurred nearly throughout the whole areas investigated ; they are geographically isolated from the 2x plants. A majority of 4x plants had the standard karyotype. The remaining tetraploids were of the aberrant type, 4x/5I, which has five acrocentric chromosomes, and two aneuploids 4x+1 and 4x-1. Both 3x and 4x forms seem to be of autopolyploid origin. Three kinds of aberrant nucleolar chromosomes with an extra satellite or an inserted secondary constriction were found in the heterozygotes for translocations of 2x plants and also in some plants of the 3x form. These aberrant plants usually form their own homogeneous populations, but were somewhat scattered throughout the range in their distribution. Thus, these individuals are considered to have perpetuated these types of chromosome aberrations which originated in the remote past.
- 種生物学会の論文
- 1988-11-15
著者
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Kawano Shoichi
Department Of Botany Graduate School Of Science Kyoto University
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NODA Shozo
Biological Institute, Osaka Gakuin University
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Noda Shozo
Biological Laboratory Osaka Gakuin University
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Kawano Shoichi
Department Of Botany Faculty Of Science Kyoto University
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Kawano Shoichi
Department Of Applied Physics Faculty Of Engineering Tohoku University
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Kawano Shoichi
Department Of Botany Faculty Of Science Kyoto University:institute Of Genetic Ecology Tohoku Univers
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