Brassica campestris×B.oleraceaの雑種子孫-3-F2,B1と他の雑種の細胞遺伝学的研究〔英文〕

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  • INOMATA Nobumichi
    Department of Biology, College of Liberal Arts and Sciences, Okayama University

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  • Hybrid progenies of the cross, Brassica campestris*B. oleracea. III. Cytogenetical studies on F2, B1 and other hybrids.
  • Brassica campestris B.oleracea ノ ザッシュ シ
  • III. Cytogenetical studies on F<sub>2</sub>, B<sub>1</sub> and other hybrids

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Cytogenetical studies on F2, B1 and other hybrids obtained from the F1 hybrids between Brassica campestris and B, oleracea were carried out. The plants examined were classified in three types. The first type plants had 29 chromosomes in root tip cells. The second type plants had 38 chromosomes and the third type plants had other than 29 or 38 chromosomes. Among the first type plants, the range of pollen fertility was 0% to 96.6%, with mean 53.2%, and the frequency of PMCs showing 10II+9I, 11II+7I and 12II+5I were 36.2%, 32.6% and 15.9%, respectively. In the second type plants, the range of pollen fertility varied from 14.0% to 99.0%, with mean 73.6%, and the frequency of PMCs showing 19II, 18II+2I and 17II+4I were 71.5%, 17.2% and 7.7%, respectively. The range of chromosome number in root tip cells of the third type plants was 18 to 58 in 33 plants examined, and the range of pollen fertility varied from 0% to 98.0%, with mean 31.8%. Many types of chromosome configuration in PMCs were observed. The possibility of newtype plants of B, campestris, B, oleracea and B. napus was discussed

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