ナタネ(Brassica napus L.)の低二倍体およびその次代の染色体数変異〔英文〕

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  • TOKUMASU Satoru
    Laboratory of Plant Breeding, College of Agriculture, Ehime University

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  • A hypodiploid of rape (Brassica napus L.) and chromosome variation in its progeny.
  • ナタネ Brassica napus L. ノ テイ ニバイタイ オヨビ ソノ

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During the course of investigation of polyploid strains in rape (Brassica napus L.), a hypodiploid (2n=32) was found, that was assumed to be of parthenogenetic origin. This plant showed good fertility and produced seeds by open pollination. Chromosome number of its progeny ranged between 2n =33 and 38, i. e., between the chromosome numbers of their parent and the eudiploid (2n=38). Pollen and seed fertilities of the progeny showed significant correlations with their chromosome numbers. Plants increased their fertilities proportionally with the increased chromosome numbers. The chromosome configurations of these plants indicated that viable zygotes had to have at least 18 chromosomes out of 19 basic (haploid) chromosomes. This is the reason why all the plants obtained had more chromosomes than their parent. The tendency for the progeny to approach the diploid in their chromosome number was discussed in relation to the maintenance of euploidy.

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