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Ascospore Analysis of Kasugamycin Resistance in the Perfect Stage of Pyricularia oryzae. M. Taga, Pesticide Research Institute, Kyoto University, Kyoto 606, Japan; H. Nakagawa(2), M. Tsuda(3), and A. Ueyama(4). (2)(3)(4)Pesticide Research Institute, Kyoto University, Kyoto 606, Japan. Phytopathology 68:815-817. Accepted for publication 1 November 1977. Copyright 1978 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-68-815.

Naturally occurring kasugamycin resistant strains of Pyricularia 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 K-7, nine asci and 56 random ascospore isolates were analyzed. Resistance was controlled by a major gene and segregated independently of mating type.

Additional keywords: rice blast fungus, antifungal antibiotic, fungal genetics, fungicide resistance.