巻号一覧
49 巻, 2 号
選択された号の論文の7件中1～7を表示しています
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HIDEO KOGA, TADAO HORIUCHI1974 年 49 巻 2 号 p. 57-62
発行日: 1974年
公開日: 2007/05/21
ジャーナル フリー(1) Mutants of phage λ occurred in gene cI which show clear plaque at high temperature but normal turbid plaque at low temperature, were isolated. (2) Lysogens for cItsA are induced irreversibly even at low temperature after heat treatment, and lysogens for λcItsB are induced only when the cultures are heated at a high temperature during growth. These results confirmed those of Lieb (1966) and Horiuchi and Inokuchi (1967). (3) λcItsA and λcItsB mutants were all mapped in the left and right part of gene cI, respectively, as reported by Lieb (1966). (4) Some λcItsB which are located on the right-end region of gene cI complement λcItsA for lysogenization.抄録全体を表示PDF形式でダウンロード (554K) -
NORIAKI EBITANI1974 年 49 巻 2 号 p. 63-70
発行日: 1974年
公開日: 2007/05/21
ジャーナル フリーOn 22 homozygous genotypes which are different in the combination of isozyme alleles at the Est-α and Est-β loci, both highly polymorphic in natural populations, two kinds of esterase activities were compared. Most of the esterase activities are controlled by these two esterase loci. The activity is highest in the genotypes which have two active alleles at both Est-α and Est-β loci. The null strain which is homozygous for silent alleles at both loci has weakest activity, a part of which may be ascribed to other genetic systems. The activity of genotypes which are homozygous for active alleles at only Est-α or Est-β locus is between these two groups. Esterase activity increases additively in proportion to the number of active alleles at each locus.抄録全体を表示PDF形式でダウンロード (758K) -
NORIAKI EBITANI1974 年 49 巻 2 号 p. 71-80
発行日: 1974年
公開日: 2007/05/21
ジャーナル フリーIn order to obtain further information about the mechanisms which maintain the remarkable isozyme polymorphisms at the Est-β locus of D. virilis, several components of fitness were compared among electrophoretically different genotypes. Esterase activities are statistically the same among three genotypes (BB, BD and DD) with similar genetic backgrounds.
Under near optimal culture conditions, the following components were examined separately for three genotypes: fecundity, hatchability, egg-to-adult viability and developmental time. No significant differences were observed among genotypes for any of these components.
Under competitive conditions in which two or three genotypes coexist in a culture vial, relative egg-to-adult viability of each genotype was estimated at several genotype frequency levels. Except for one case in which a rare DD genotype was more viable than abundant ones, the relative viability did not differ among coexisting genotypes and no clear and consistent evidence of frequency-dependent selection was obtained.
The results of the present experiments suggested that esterase isozyme variants are of no great adaptive significance, so far as they are at the same level of enzyme activity.抄録全体を表示PDF形式でダウンロード (1077K) -
HIKOYUKI YAMAGUCHI1974 年 49 巻 2 号 p. 81-85
発行日: 1974年
公開日: 2007/05/21
ジャーナル フリーDormant seeds of two partially asynaptic strains, K-642 and K-648, in which 2 to 8 univalents were present at the first metaphase of meiosis, and a normal cultivar Kinmaze were irradiated with gamma rays of 0 to 30kR. The survival rate at maturity of the X1 plant was reduced to a marked extent in K-642 and K-648 compared with Kinmaze. The mean seed setting in K-648 was slightly less than in Kinmaze. The incidence of chlorophyll mutations in Kinmaze increased linearly with the radiation dose. In contrast, the mutation frequency in K-648 was found to increase more rapidly than a single power of the dose of gamma rays. Supposing that the loose association of homologous chromosomes in somatic cell is correspondent with the failure of hromosome pairing at meiosis, the results obtained in this experiment provide the evidence of a common basis for repair and recombination mechanisms even in rice.抄録全体を表示PDF形式でダウンロード (458K) -
YOSHIHISA FUJIO, TOHRU SHIBUYA1974 年 49 巻 2 号 p. 87-91
発行日: 1974年
公開日: 2007/05/21
ジャーナル フリーThe Creeper (Cp) gene from the Jitokko was introduced into the inbred strains, WL-G and NG-A, and two strains Cp (WL-G) and Cp (NG-A) were established in the gradings by successive backcrosses.
In the Cp (NG-A) strain, heterozygous parents produced the expected homozygous Cp/Cp embryos, 83.2% of which was viable on the 10th day of incubation and in the Cp (WL-G) strain viable homozygous Cp/Cp embryos were not obtained. Although the Cp (NG-A) showed high percentage of viable homozygous Cp/Cp embryos, the percentage decreased as maternal ages increased.抄録全体を表示PDF形式でダウンロード (413K) -
SEI-ICHI MATSUI1974 年 49 巻 2 号 p. 93-96
発行日: 1974年
公開日: 2007/05/21
ジャーナル フリーPDF形式でダウンロード (1364K) -
TAMOTSU HASHIMOTO, KENICHI MATSUBARA1974 年 49 巻 2 号 p. 97-101
発行日: 1974年
公開日: 2007/05/21
ジャーナル フリーPDF形式でダウンロード (533K)
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