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A New Semidwarf Mutant in a Long-Grain Rice Cultivar¹

The inheritance of an induced short stature mutant, Short Labelle, recovered from the rice (Oryza sativa L.) cultivar Labelle was investigated. In crosses with Labelle and ‘Lebonnet’, the F₁ plants were tall, and the short stature characteristic segregated as a single recessive factor in the F₂ generation. Progeny tests in a cross with ED7 indicated Short Labelle carried semidwarfing gene nonallelic to the sd₁> gene in ED7. F₁ sterility and F₂ segregation for sterility was observed in the Labelle and Lebonnet crosses. Pleiotropic effects on grain and mesocotyl lengths were noted. In 2 yrs of multiple location testing the agronomic characteristics of Short Labelle were similar to Labelle, although Short Labelle yields were generally lower. However, because it has a semidwarfing gene nonallelic to the sd₁ source, Short Labelle may be a useful germplasm source for rice improvement.

Key Words: Short stature • Inheritance • Germplasm • Induced mutation • Oryza sativa L.

² Associate professor, Rice Res. Stn., Louisiana Agric. Exp. Stn., LSU Agric. Ctr. Crowley, LA 70527, and research geneticist, USDA-ARS, Davis CA 75616.

Received for publication March 18, 1985.