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Published in Crop Sci 14:875-877 (1974)
© 1974 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Single Dw3 Height-Gene Effects in 4- and 3-Dwarf Hybrids of Sorghum bicolor (L.) Moench1

K. F. Schertz, D. T. Rosenow, J. W. Johnson and P. T. Gibson2

Four-dwarf, heterozygous 3-dwarf, and homozygous 3-dwarf hybrids of grain sorghum [Sorghum bicolor (L.) Moench] differing at the Dw3 locus were compared for height and other characteristics to elucidate this locus. This should not be confused with the Dw2 locus for which commercial hybrids may differ. The two female parents were derived from a 4-dwarf line and a tall mutant from it and the male parents were derived from a 4-dwarf doubled haploid and a tall mutant from it.

The homozygous and heterozygous tall 3-dwarf hybrids exceeded the short 4-dwarf hybrid in height, grain yield (not statistically significant in 1 of 2 years), and kernel weight. Hybrids from 3-dwarf males were taller and had heavier kernels than hybrids from 4-dwarf (short) males. Hybrids from 3-dwarf females were taller than hybrids from 4dwarf (short) females, but grain yield comparisons were inconsistent. Homozygous and heterozygous 3-dwarf hybrids did not differ significantly except in height.

Key Words: Grain sorghum • Isogenic • Tall mutant

1 Contribution froni the ARS-USDA and Texas A&M University, Soil and Crop Sciences Department, College Station, Texas; and the Texas Agricultural Experitnetit Station, Texas A&M University Agricultural Research and Extension Center, Lubbock, Texas.

2 Geneticist, ARS, USDA, College Station, Texas; Associate Professor and Assistaut Professor, Texas A&M Uuiversity Agricultural Research and Extension Center at Lubbock; and Student Assistant, Texas A&M University, College Station, Texas.

Received for publication January 26, 1974.




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