The Japanese Journal of Genetics
Online ISSN : 1880-5787
Print ISSN : 0021-504X
ISSN-L : 0021-504X
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Volume 65, Issue 2
Displaying 1-5 of 5 articles from this issue
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REGULAR PAPERS
  • Chemical communication of emigration behavior of Drosophila melanogaster. I. Strain difference
    Takashi NARISE, Sumiko NARISE
    1990 Volume 65 Issue 2 Pages 37-45
    Published: 1990
    Released on J-STAGE: June 10, 2006
    DOIhttps://doi.org/10.1266/jjg.65.37
    JOURNAL FREE ACCESS
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    Experiments were conducted with six homozygous strains of D. melanogaster belonging to a population from Matsuyama, Ehime Prefecture, in order to examine whether or not a substance(s) secreted by one strain affects the emigration behavior of another strain. From the results of experiments in which flies of one strain in a central tube were discarded and those of another strain were newly introducted, it appeared that in some combinations emigration behavior of the latter strain was influenced by a substance(s) secreted by the former strain. The result suggests that the behavior should be under the genetic control, because the differential responses to the substance secreted by fruit flies were observed among homozygous strains. Bioassay experiments were performed to detect the biologically active substance extracted from adult flies using two strains of the population. The results of bioassay with materials obtained from several steps of separation suggested that the substance may be a kind of fatty acid and different among strains.
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  • Natural and laboratory hybridization between Drosophila melanogaster and D. simulans
    Yutaka INOUE, Takao K. WATANABE, Masayoshi WATADA
    1990 Volume 65 Issue 2 Pages 47-51
    Published: 1990
    Released on J-STAGE: June 10, 2006
    DOIhttps://doi.org/10.1266/jjg.65.47
    JOURNAL FREE ACCESS
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    Interspecific crossability between two sibling species, Drosophila melanogaster and D. simulans, were examined in nature and in the laboratory. About 4.6% of D. melanogaster females were found to be inseminated by D. simulans males in six Japanese natural populations. In the laboratory experiments D. melanogaster females collected and established from non-sympatric or newly sympatric sites with D. simulans were more easily inseminated than those from historically sympatric sites. It may be suggested that the premating isolation does not develop rapidly after the sibling species come sympatry.
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  • D-loop forming activity and general recombinatory activity in extracts from shoot, flower and callus of varieties of rice
    Atsushi HIGASHITANI, Satoshi TAMAMOTO, Satoshi TABATA, Kiyoharu OONO, ...
    1990 Volume 65 Issue 2 Pages 53-64
    Published: 1990
    Released on J-STAGE: June 10, 2006
    DOIhttps://doi.org/10.1266/jjg.65.53
    JOURNAL FREE ACCESS
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    Preliminary studies on recombination in two groups of rice were carried out by measuring the D-loop forming activity of cellular extracts from shoots and calli. In the shoots, japonica group showed higher recombinatory activities than indica group. In calli, both groups had nearly equal activities. The recombination activity was measured by using plasmid DNAs. In calli and enriched flowers, japonica showed higher frequencies of intermolecular recombination between homologous DNAs than indica. The higher frequencies in the enriched flower fraction, at a certain developmental stage of spike, suggested a contribution from meiotic cells which had been shown to a have high recombinatory activity in earlier studies.
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  • The sex chromosome association (Sxa) gene is located on the X-chromosome in mice
    Hirotami T. IMAI, Masayasu Y. WADA, Kazuo MORIWAKI
    1990 Volume 65 Issue 2 Pages 65-69
    Published: 1990
    Released on J-STAGE: June 10, 2006
    DOIhttps://doi.org/10.1266/jjg.65.65
    JOURNAL FREE ACCESS
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    The genetic factor "Sxa" controlling the end-to-end association of the sex chromosome in mice is linked closely (R.V.=4.6%) to Crm (cream), which is located near the distal end of the X chromosome.
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  • Novel UGA-suppressors in Escherichia coli K-12
    Zhen CHANG, Hachiro INOKUCHI, Haruo OZEKI
    1990 Volume 65 Issue 2 Pages 71-81
    Published: 1990
    Released on J-STAGE: June 10, 2006
    DOIhttps://doi.org/10.1266/jjg.65.71
    JOURNAL FREE ACCESS
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    UGA-specific nonsense suppressors from Escherichia coli K-12 were isolated and characterized. On of them (Su+UGA-11) was identified as a mutant of the prfB gene for the peptide releasing factor RF2. It appears that in this strain, while peptide release at sites of UGA mutations is retarded, the UGA stop codon is read through even in the absence of a tRNA suppressor, exhibiting a novel type of passive nonsense suppression. Three suppressors (Su+UGA-12, -16 and -34) were capable of restoring the streptomycin sensitive phenotype in resistant bacteria (strAr). Because of their drug-related phenotype, these are possibly mutations in the components of the ribosomal machinery, particularly those concerned with peptide release at UGA nonsense codons. A tRNA suppressor was also obtained which was derived from the tRNATrp gene. In this strain, a long region between rrnC (84.5 min) and rrnB (89.5 min) was duplicated and one of the duplicated genes of tRNATrp was mutated to the suppressor. The mechanism of UGA-suppression is discussed in terms of translation termination at the nonsense codon in both active and passive fashions.
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