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Induced Early-Maturing Mutation in Sorghum¹

An early-maturing Sorghum bicolor (L.) Moench mutant (1030) induced by diethylsulfate is described. The mutant flowered 3 weeks earlier than the parental cultivar, ‘Rox Orange.’ Culm height was reduced by 116 cm. There was a 48% reduction in number of nodes and a 35% reduction in internode length. Segregation data from six crosses suggested that a single gene controllig flowering had mutated from dominant to recessive.

Variable magnitudes of additive and dominance ef. fects, and degree of dominance were recorded for days to flower, number of nodes, internode length, and culm height for different crosses. All parental lines and hybrid populations flowered later than the early-maturing mutant and consequently had a higher number of nodes.

Key Words: Height • Node • Internode • Days to flower • Gene effect • Additive • Dominance • Regression

² Former Research Assistant (now at the International Maize and Wheat Improvement Center, Apdo. Postal 6-641, Londres 40, Mexico 6, D.F.) and Professor, respectively, Department of Agronomy, University of Wisconsin, Madison.

Received for publication July 25, 1973.