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Single Height-Gene Effects in Doubled Haploid Sorghum bicolor (L.) Moench as Influenced by Stand Density¹

The expression of distinctive characteristics of short and tall sorghum (Sorghum bicolor (L.) Moench) was determined in two stand densities. A short doubled-haploid line, recessive at four major height loci (4-dwarf), was compared with two tall mutant derivatives, recessive at three loci (3-dwarf) and dominant at the Dw₃ locus. The 3-dwarf plants exceeded the 4-dwarf plants in height, internode length, leaf-blade length, grain yield, and kernel weight. The 4-dwarfs, however, had longer panicles and peduncles. The denser stand had a depressing effect on panicle length of the 3-dwarf plants but not on the panicle length of the 4-dwarf plants. The two tall lines differed in leaf-blade width and in weight per 1,000 kernels.

Key Words: Grain sorghum • Dwarf • Isogenic • Tall mutant • Three-dwarf

² Genetics, ARS, USDA, College Station, Texas

Received for publication November 29, 1972.