シャロット由来単一異種染色体を添加したネギ系統における添加染色体の伝達率

DOI NDLデジタルコレクション 日本農学文献記事索引 Web Site Web Site 参考文献11件

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タイトル別名
  • Transmission Rates of Extra Chromosomes in Alien Monosomic Addition Lines of Japanese Bunching Onion with Extra Chromosomes from Shallot.

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In a series of alien monosomic addition lines (AMALs, FF+nA, 2n=17) of Allium fistulosum L. with extra chromosomes from A. cepa L. Aggregatum group, the transmission rates of the extra chromosomes were assessed to examine the possibility of maintaining these lines by seed propagation. Chromosome numbers of the seedlings obtained from reciprocal crossings between the AMALs and A. fistulosum (2n=16 ; genomes, FF) were 16 and 17. The percentage of plants with 17 chromosomes in the seedlings obtained from the crossings FF (♀)×FF+nA (♂) and FF+nA (♀)×FF (♂) were used to indicate the male and female transmission rates, respectively. The male transmission rates varied from 0 to 7.6% (mean 2.6%) among eight kinds of extra chromosomes, whereas the female transmission rates ranged from 6.1 to 40.4% (mean 19.8%). These results revealed the following : 1) Both the male and female transmission rates are generally low. 2) These rates show considerable variations among the extra chromosomes. 3) The female transmission rate is obviously higher than the male transmission rate in all AMALs. Furthermore, both transmission rates of the extra chromosome 8A were relatively high and those of 5A were low. Chromosome numbers of the pollen grains produced by the AMALs were eight and nine. The percentages of pollen grains with nine chromosomes varied from 18.1 to 49.4% (mean 34.9%) among the eight types of AMALs and were undoubtedly higher than the male transmission rates in all the AMALs. These phenomena seem to relate to a certation between pollen grains with different chromosome numbers or a chromosome elimination after fertilization. The present results demonstrate that crossings, with the AMALs as seed parents, are useful to maintain the series of AMALs by seed propagation.

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  • 園芸学会雑誌

    園芸学会雑誌 68 (1), 18-22, 1999

    一般社団法人　園芸学会

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