巻号一覧
60 巻, 6 号
選択された号の論文の5件中1～5を表示しています
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Kenji YUKUHIRO, Ko HARADA, Terumi MUKAI1985 年 60 巻 6 号 p. 531-537
発行日: 1985年
公開日: 2006/07/25
ジャーナル フリーMutations were accumulated for 9 generations on 53 second chromosomes that originated from a single chromosome. The test of viability for these chromosomes indicates that the P elements induce mainly lethal and severely detrimental mutations. The lethal load induced during 9 generations was approximately 1.5times as large as that of the equilibrium populations. These mutations did not modify the specific activity of alcohol dehydrogenase. These findings were a sharp contrast to those for the mutations induced by a putative transposon detected in the Osaka population by Mukai and Yukuhiro (1983).抄録全体を表示PDF形式でダウンロード (717K) -
Koichi UENO, Hiroshi SENOU, Ik So KIM1985 年 60 巻 6 号 p. 539-544
発行日: 1985年
公開日: 2006/07/25
ジャーナル フリーThe karyotypes of five cobitid fishes inhabiting South Korea were examined. Four species belonging to the genus Cobitis, viz., C. taenia lutheri, C. koreensis, C. longicorpus and C. rotundicaudata had a diploid chromosome number of 50, consisting of more monoarmed chromosomes than biarmed ones (NF; 64-70), while Misgurnus mizolepis was shown to have 48 chromosomes, suggesting the possibility of a Robertsonian rearrangement (2n=50→ 48, NF; 64) from closely related species (e.g., M. angillicaudatus). With reference to the information so far obtained, the karyotype evolution process in the family Cobitidae was discussed.抄録全体を表示PDF形式でダウンロード (706K) -
III. A tetraploid species Trillium tschonoskii MaximowiczAkinori UCHINO1985 年 60 巻 6 号 p. 545-555
発行日: 1985年
公開日: 2006/07/25
ジャーナル フリーThe tetraploid species, Trillium tschonoskii Maximowicz (4x=20, K2K2- TT), was studied with special reference to four natural populations in Kyushu and Hokkaido. Different chromosome types revealed by the patterns of Hsegments of cold-treated chromosomes were successfully classified into two series of homologous chromosomes, K2* and T*, in each of five chromosomes, A to E. The series were polymorphic with respect to constituent chromosome types. Thus, both the genomes K2 and T are polymorphic, suggesting the extinct progenitors, K2K2 and TT, to be chromosomally polymorphic. Karyotypes were homozygous for all ten pairs of homologous chromosomes in all individuals, but different homokaryotypes could be distinguished among 184 homokaryotypes observed. No karyotypes were common between the populations of Kyushu and Hokkaido, though the number of plants examined in Hokkaido was much less (9 plants) than that in Kyushu (56-61 plants). However, the progenitor diploids may possibly differ between Kyushu and Hokkaido. Intact flowers and flowers covered with cotton-bags ripened into fully developed plump fruits, yielding many good seeds. But flowers castrated and left in the open air yielded very few or no good seeds. This indicates that the population structure is maintained predominantly by self-pollination.抄録全体を表示PDF形式でダウンロード (1675K) -
Akinori UCHINO1985 年 60 巻 6 号 p. 557-564
発行日: 1985年
公開日: 2006/07/25
ジャーナル フリーChromosomal variation in the tetraploid species Trillium tschonoskii (4x= 20, K2K2TT) from a population in Hokkaido and three populations in Kyushu was analyzed by the patterns of H-segments which were revealed by cold treatment of the chromosomes. Chromosomal variation in the K2T genome complex in the interspecific hybrid, T.×miyabeanum (4x=20, K2TSU), was also analyzed. A total of 21 different chromosome types were distinguished in the K2T complex, i.e., A1-A2 in chromosome A, B1-B4 in B, C1-C6 in C, D1-D4 in D, and E1-E5 in E. All were assortable into two series of homologous chromosomes, K2* and T*. K2* is either the genome K2 or T in each of the chromosomes A to E. The same holds true for T* also. Since K2* and T* were both polymorphic in all chromosomes, A to E, it is valid that both the genomes K2 and T are chromosomally polymorphic. Consequently, it is certain that both extinct diploid progenitors, K2K2 and TT, are chromosomally polymorphic.抄録全体を表示PDF形式でダウンロード (746K) -
Hisashi TSUJIMOTO, Koichiro TSUNEWAKI1985 年 60 巻 6 号 p. 565-578
発行日: 1985年
公開日: 2006/07/25
ジャーナル フリーWhen gametocidal agents (gametocidal genes or chromosomes) derived from four Aegilops species, Ae. speltoides, Ae. sharonensis, Ae. longissima and Ae. triuncialis, are present in a hetero- or hemizygous state in wheat, they cause a syndrome characterized by male and female sterility, seed shriveling, chromosome breakage and mutation. However, the characteristics of the syndrome differ among the agents. Gametocidal gene, Gc1, originally from Ae, speltoides, induces sterility, seed shriveling and mutation in the F1 generation. In this case, seed shriveling is accentuated by low temperature, about 5 to 11 hrs after the pollination. Gametocidal chromosomes, 4Ssh of Ae. sharonesis and 4S1 of Ae. longissima, cause high rates of mutation and chromosome aberration in addition to sterility, although they do not induce seed shriveling. Chromosome 3C of Ae. triuncialis induces only sterility in the F1, though chromosome breakage and mutation are induced in the B11generation in the presence of its suppressor, Igc1 (from a common wheat cultivar Norin 26). The syndromes caused in wheat by these gametocidal agents are compared to hybrid dysgenesis observed in Drosophila melanogaster.抄録全体を表示PDF形式でダウンロード (2200K)
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