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Relation of Seedling Vigor to Semidwarfism, Early Maturity, and Pubescence in Closely Related Rice Lines¹

The effects of independent single genes for plant height, maturity, and pubescence on rice (Oryza sativa L.) seedling vigor in closely related, homozygous F₄ lines were studied in laboratory and water-seeded field experiments. Laboratory seedling height, days to emergence, emergence percentage, emergence index, and 100-grain weight were measured. Mature plant height and maturity had no significant affect on laboratory seedling height. Pubescent lines as a group exhibited greater seedling vigor than glabrous lines in the laboratory seedling height test, and emerged through the water sooner in the field test. However, several individual glabrous lines exhibited as much vigor as pubescent lines. Tall lines as a group showed a higher emergence percentage than semidwarf lines. There was a significant height x maturity x pubescence interaction for emergence percentage and emergence index. Semidwarf lines with seedling vigor equal to the tall parent were obtained. It appears that moderately high levels of seedling vigor can be attained in high yielding semidwarf rice cultivars.

Key Words: Short stature • Early heading • Glabrousness • Laboratory seedling height • Seedling emergence • Oryza sativa L.

² Graduate student, Dep. of Agronomy and Range Science, Univ. of California, Davis; research geneticist, SEA, AR, USDA, Davis, Caiif; professor, Dep. of Agronomy and Range Science, Univ. of California, Davis, CA 95616.

Received for publication April 13, 1979.