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Height Modification Within Three-dwarf and Four-Dwarf Progenies of Grain Sorghum¹

Three and four-dwarf varieties and hybrids of grain sorghum [Sorghum bicolor (L.) Moench] were used to determine the effectiveness of selection for height within these major height genotypes. Selection was begun for short and tall plants, as measured by height to the flag leaf in the F₂ and S₂ and was continued in the F₃ and S₃ generations. Tests were conducted with the F₄ and S₄ generations to evaluate the effects of selection on height of flag leaf, total plant height, and days to first bloom.

Selection for height of flag leaf was successful in four of the 30 progenies tested. As a result, total plant height was altered in three of these progenies. Number of days to first bloom was reduced for one progeny effectively selected for shortness.

Key Words: Sorghum bicolor • Genetics • Breeding

² Research Assistant, Soil and Crop Sciences Department, Texas A&M University, currently Department of Agronomy, Purdue University; Geneticist, Plant Science Research Division, Agricultural Research Service, U.S. Department of Agriculture; Assistant Professor, Texas A&M University Agricultural Research and Extension Center at Lubbock; and Research Associate, Texas A&M University, College Station, Texas, respectively.

Received for publication February 19, 1971.