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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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