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Genetic Analyses of Four Diethyl Sulfate-Induced Culm Height Mutants of Sorghum¹

Four diethyl sulfate-induced culm height mutants of Sorghum bicolor (L.) Moench were crossed among themselves and to the parental cultivars and four tester lines to obtain information on inheritance of the mutant characters. The mutants varied phenotypically among themselves and were different from the parental cultivars and from the tester lines for culm height, internode length, and node number.

One mutant (ES-1) showed a digenic difference for culm height, but two others (ES-2 and RO-1) exhibited monogenic differences in crosses with their parental cultivars. Monogenic inheritance was shown for internode length and number of nodes for progenies from mutant x parent crosses ES-2 and RO-I. Data from crosses among mutants suggested that E-2 and R-I were nonallelic to each other for culm height, but ES-I showed high dominance with ES-2 and RO-I for this character. Mutant ES-3 was much different from the three others and did not allow flowering in 1972. Its behavior suggested that possibly a major mutation had occurred at a locus other than the four known height loci.

Non-additive effects played a more important role than additive effects in the expression of culm height and internode length. The ratio of h/d suggested high overdominance in most crosses for these two characters. The converse was true for number of nodes.

Key Words: Height inheritance • Convolution approach • Gene effect • Overdominance • Sorghum bicolor (L.) Moench.

² Formerly research assistant and professor, respectively, Dep. of Agronomy, Univ. of Wisconsin, Madison.

Received for publication November 5, 1976.