The Japanese Journal of Genetics
Online ISSN : 1880-5787
Print ISSN : 0021-504X
ISSN-L : 0021-504X
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Volume 65, Issue 4
Displaying 1-9 of 9 articles from this issue
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REGULAR PAPERS
  • A new type of mei-9 allele in Drosophila melanogaster which is recombination-competent but repair-deficient
    Akihiko H. YAMAMOTO, Tomoyuki WADA
    1990 Volume 65 Issue 4 Pages 165-172
    Published: 1990
    Released on J-STAGE: June 10, 2006
    DOIhttps://doi.org/10.1266/jjg.65.165
    JOURNAL FREE ACCESS
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    An X-linked meiotic gene mei-9 controls both meiotic recombination in Drosophila females, and somatic excision repair in both sexes. Homozygous females of two of three mei-9 alleles, induced through hybrid dysgenesis and screened for the sensitivity to MMS, showed no defect in recombination on the second chromosome and had normal X chromosome segregation. The MMS sensitivity of the two recombination-competent alleles was mapped to the close approximity to the mei-9 locus. It supports the idea that the two mutations are alleles of mei-9 and that the meiotic and somatic functions of the gene are distinguishable.
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  • Cytogenetical analysis of a nonwaxy gene transferred from Elytrigia elongata to Triticum durum
    Kejing DENG, Hajime ONO
    1990 Volume 65 Issue 4 Pages 173-181
    Published: 1990
    Released on J-STAGE: June 10, 2006
    DOIhttps://doi.org/10.1266/jjg.65.173
    JOURNAL FREE ACCESS
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    A locus of the nonwaxy character, which locates on the e4t s telosome of Elytrigia elongata, was transferred to the chromosome of durum wheat (Triticum durum L. cv. Stewart). This translocation was cytologically and genetically shown to involve a short arm of chromosome 2B. Fifty percent of the translocated chromosomes were transmitted through female gamete and 19.2% through male gamete, and homozygotes were obtained at a frequency of 8% in the selfed progeny of the translocation heterozygote. Our results suggest that the e4ts telosome of E. elongata is homoeologous to the short arm of chromosome 2B of durum wheat.
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  • Endogenous gibberellin relationships in internode elongation of floating rice: A genetic study
    Hiroshi SUGE, Ismail TÜRKAN
    1990 Volume 65 Issue 4 Pages 183-191
    Published: 1990
    Released on J-STAGE: June 10, 2006
    DOIhttps://doi.org/10.1266/jjg.65.183
    JOURNAL FREE ACCESS
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    Application of an inhibitor of gibberellin biosynthesis, S-327D, inhibited elongation of internode in floating rice under submergence. The amount of endogenous gibberellin decreased corresponding with the increasing dose of the inhibitor. However, no direct correlation was detected between the total length of elongated internode under submergence and the endogenous gibberellin content among F2 plants, obtained from a cross between non floating rice and floating rice, which had different total lengths of elongated internodes.
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  • Some consideration on diversifying selection
    Fumio TAJIMA, Terumi MUKAI
    1990 Volume 65 Issue 4 Pages 193-200
    Published: 1990
    Released on J-STAGE: June 10, 2006
    DOIhttps://doi.org/10.1266/jjg.65.193
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    The diversifying selection due to genotype-environment interaction can increase the genetic variation in natural populations. It is known, however, that the conditions for stable genetic polymorphism or marginal overdominance are quite restricted in this selection model. In this paper a simple model of diversifying selection was examined, and the following results were obtained: (1) Even when the conditions for marginal overdominance are not satisfied, if the diversifying selection is operating, the frequency of mutants can be higher than that in the case of simple mutation-selection balance. (2) This selection model causes a large amount of genetic load (environment load), even when the conditions for marginal overdominance are not satisfied, namely even when the equilibrium frequency of mutant is very low. From these results it can be concluded that the number of loci on which this type of diversifying selection is operating is very small, if any.
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  • Detection of a low temperature-resistant gene in the guppy (Poecilia reticulata), with reference to sex-linked inheritance
    Yoshihisa FUJIO, Masamichi NAKAJIMA, Yasuaki NAGAHAMA
    1990 Volume 65 Issue 4 Pages 201-207
    Published: 1990
    Released on J-STAGE: June 10, 2006
    DOIhttps://doi.org/10.1266/jjg.65.201
    JOURNAL FREE ACCESS
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    Response to low temperature was measured in different strains in the guppy, Poecilia reticulata. The responses of each strain were measured as survival rates, which were calculated from the survived fish after 24 h at 12°C for fishes acclimated at 23°C. The values for response measurements demonstrate the survival rates that were very different among strains, and among females and males within each strain.
    The progeny tests for resistant (R) and susceptible (r) to the low temperature treatment in intra-crosses indicated a mode of sex-linked inheritance.
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  • Chromosome identification of seven primary trisomics in inbred rye (Secale cereale L.) by acetocarmine Giemsa C-banding
    J. FUJIGAKI, T. TSUCHIYA
    1990 Volume 65 Issue 4 Pages 209-219
    Published: 1990
    Released on J-STAGE: June 10, 2006
    DOIhttps://doi.org/10.1266/jjg.65.209
    JOURNAL FREE ACCESS
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    Seven primary trisomics were isolated in the progeny of autotriploids of an inbred rye line (Secale cereale L.). Each triplicated chromosome was cytologically identified by the improved acetocarmine Giemsa C-banding method. This method elucidates qualitative and quantitative traits of the individual chromosomes in the complement.
    Chromosomes 1 and 2 were non-satellited, while the others (chromosomes 3, 4, 5, 6, and 7) had secondary constrictions in the short arms with different sizes of satellites. Chromosomes 4 and 5 had clear tertiary constrictions in their long arms. After C-banding, prominent bands were observed on both terminal ends of chromosomes 1 and 3. Chromosome 2 had somewhat weak bands on both terminal ends. The satellites of chromosomes 4, 5, 6, and 7 were heavily stained, but the long arm of chromosome 4 had three weakly stained bands, whereas chromosome 5 had two weak and two still weaker bands. Two weakly stained bands were observed in the long arm of chromosome 6. A prominent band on the end of the long arm and a weak one close to the terminal band were recognized in chromosome 7. A diamond shaped centromere was detected in some cells. These characteristics were cytologically confirmed in all seven types of primary trisomics.
    Homoeologous relationships to the wheat chromosomes were discussed. Rye chromosomes 1 to 7 in this study are homoeologous with wheat chromosomes and designated as 2R, 7R, 3R, 4R, 6R, 5R, and 1R, respectively.
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