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Utility of artificial mutations in plant breeding 12. induction and gene analysis of male sterile mutants in rice



Utility of artificial mutations in plant breeding 12. induction and gene analysis of male sterile mutants in rice



Japanese Journal of Breeding 30(4): 367-374



Seeds of 3 rice varieties were treated with EI [ethyleneimine] (0.5%, vol/vol) and X-rays (25kR), then male-sterile mutants induced were screened in the M2-M4 [mutant generations]. The plants that showed complete sterility in self pollination without female organ abnormality were defined as male-sterile mutants. Anthers of those plants were indehiscent, containing few or no good pollen grains. The EI treatments yielded male-sterile mutants for all 3 varieties with frequencies of 0.30-0.38%, totaling 8 mutants; X-irradiation was ineffective in inducing the mutants. F1 hybrids from the crosses between the mutants and their original varieties exhibited a normal seed fertility under self- and open pollinations. The segregation ratio in F2 showed that the mutants, except one, were controlled each by a single recessive gene. Allelisms tested with those recessive genes revealed that at least 6 different loci were responsible for the different male sterilities, indicating that EI treatment is highly effective in inducing male-sterile mutants and that a considerable number of loci are concerned with male sterility in rice.

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