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Inheritance of Resistance to Races IB-54 and IG-1 of Pyricularia oryzae in Rice¹

Rice blast, caused by Pyricularia oryzae Cav., is an internationally important disease of rice (Oryza sativa L.). Information on the mode of inheritance of reaction to races of blast is useful in breeding resistant cultivars. The inheritance of resistance to two specific races of P. oryzae, IB-54 and IG-1, was studied in a cross between the resistant cultivar ‘Lebonnet’ and a susceptible selection, CI 9888. Resistance to both races was shown to be conditioned by a single dominant gene by greenhouse inoculation tests performed on the F₁, F₂, and F₃ generations.

Key Words: Oryza sativa L. • Rice blast • Plant genetics • Disease resistance

² Former graduate student and associate professor of plant breeding, respectively, Texas A&M Univ., College Station, TX 77843; research agronomist, and research plant pathologist, respectively, ARS, USDA, Texas A&M Univ. Agric. Research and Extension Center, Beaumont, TX 77706.

Received for publication September 10, 1977.