Ascospore Analysis of Kasugamycin Resistance in the Perfect Stage of Pyricularia oryzae

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Abstract
Naturally occurring kasugamycin resistant strains of P. oryzae from rice were crossed with sensitive strains from finger millet. Minimal inhibitory concentrations for growth of progeny isolates were approximately the same value as those for the parent isolates. Using isolates from finger millet, resistant strains selected in vitro were crossed with sensitive strains. In a cross of strains Ta-1-5 .times. K-7, nine asci and 56 random ascorpore isolates were analyzed. Resistance was controlled by a major gene and segregated independently of mating type.

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