MUTATIONS WITH GAMMA IRRADIATION ON DORMANT SEEDS OF A PARTIALLY ASYNAPTIC STRAIN IN RICE

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概要

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• 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.

• 日本遺伝学会の論文

著者

• YAMAGUCHI HIKOYUKI

  Laboratories of Radiation Genetics and Biometrics, University of Tokyo

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• Analyis sof homology of small plasmid-like mitochondrial DNAs in the diferent cytoplasmic male sterile strains in rice.
• Decreased activity of DNA polymerase in seeds of barley during storage.
• MUTATIONS WITH GAMMA IRRADIATION ON DORMANT SEEDS OF A PARTIALLY ASYNAPTIC STRAIN IN RICE

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