遺伝学雑誌
Online ISSN : 1880-5787
Print ISSN : 0021-504X
ISSN-L : 0021-504X
34 巻, 3 号
選択された号の論文の4件中1~4を表示しています
  • Teiji IIJIMA
    1959 年 34 巻 3 号 p. 77-83
    発行日: 1959年
    公開日: 2007/05/21
    ジャーナル フリー
    Compatibility mutants such as Hfr-i, Hfr-i' and Hfr- were isolated from Hfr (Hayes' strain) by acriflavine treatment. Hfr-i, Hfy-i' and Hfr- resemble F+, Fi and F- respectively in their mating behavior, possession or lack of transmissible agent and susceptibility to infection by F. There is no difference, between Hfr-i and F+ in their mating behavior, the role as chromosome donor in recombination and possession of transmissible agent, and there is also no difference between Hfr- and F- in their mating behavior, the role as chromosome recipient in recombination and susceptibility to infection by F within the limits of the technique empolyed.
  • Kazuo SAITOH
    1959 年 34 巻 3 号 p. 84-87
    発行日: 1959年
    公開日: 2007/05/21
    ジャーナル フリー
    The chromosomes of the haploid group in 11 species of moths from 6 families were investigated in squash material prepared with the application of acetic dahlia. The species under study and the chromosome numbers established are listed in Table 1.
  • 3. Bacillus megatherium の核および核の融合
    平野 正
    1959 年 34 巻 3 号 p. 88-95
    発行日: 1959年
    公開日: 2007/05/21
    ジャーナル フリー
    1. Bacillus megatherium の核は休止核では高等生物と同様に球形であり, 分裂像では2個の染色体様顆粒が, じゆず状に連なっている。したがって染色体数はn=2であるらしい。核の数は定常期において1細胞1核である。
    2. 核の融合を位相差顕微鏡によって連続的に観察することができた。すなわち核の融合のおこるときは, 菌は小さな細胞に分裂する。この小細胞には2個の染色体様顆粒がみられる。この染色体様顆粒は20分で娘核を形成し休止核になる。休止核をもった小細胞はたがいに隣り合う細胞の間で融合をおこなう。核は休止核のまま隔膜をへだてて, 原形質様の連絡によってつながり, 菌体の長軸に平行に円筒状の融合核をつくる。融合核の形成とともに隔膜はみられなくなり1個の大形細胞になる。
    この現象は autogamy と考えることができる。核の融合に要した時間, 染色体様顆粒が休止核を形成する時間はいずれも20~30分である。
  • III. 2n=28 染色体をもつ TperHRF1 植物の花粉母細胞成熟分裂
    中島 吾一
    1959 年 34 巻 3 号 p. 96-101
    発行日: 1959年
    公開日: 2007/05/21
    ジャーナル フリー
    1. In the present report, the result of cytological studies on the maturation division of PMC's of TperHRF1 plants having 2n=28 chromosomes as the number for the eu-trigeneric triple hybrid was descrived. These F1 plants were obtained in 1958.
    2. At the heterotypic metaphase on meiosis of PMC's of these F1 plants 0-6 bivalents and 28-16 univalents were observed (Figs. 1-7). The frequency of the bivalents in one PMC was shown in Table 1. Almost all the bivalents consisted of two elements of equal size, but in very rare cases, heteromorphic bivalent was observed (Fig. 8). Most of the bivalents were stick-shaped loosely conjugated end to end, but some of them were ring-shaped joined closely at two ends (1077 ring-shaped in 18224 bivalents). It seems that 4 of the 6 bivalents are raised from autosyndesis of the chromosomes of AB genomes of T. persicum and the other 2 may be raised from autosyndesis of which V and R genomes of H. villosa and S. cereale respectively, considering the results of cytological researches on the intergeneric hybrids between Triticum, Secale and Haynaldia and on the haploid plant of S. cereale by Kostoff (1937), Nordenskiöld (1939) and Nakajima (1956, '57).
    3. Trivalent was observed, though rarely, in addition to bivalents at the heterotypic metaphase, and tetravalent only once among 12600 PMC's.
    4. In most individuals of the TperHRF1 plants used in this research, the meiosis of PMC's showed F1-type division just as in the Triticum-Secale F1 hybrids, but in two individuals (Tper HRF-1S-5, -S-17) all the 28 univalents were found to form the equatorial plate besides the F1-type division (Table 2).
    5. All the 22 TperHRF1 plants investigated may be considered as, what might be called, the eu-trigeneric triple hybrid in which AB genomes of Triticum persicum, V genome of Haynaldia villosa and R genome of Secale cereale are completely included.
    6. The distribution of chromosomes to opposite poles at the anatelophase in heterotypic division proceeded at random in F-type division, while in the case of the formation of equatorial plate some 28 chromosomes were distributed to each pole (Table 3).
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