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Inheritance of Some Bloomless and Sparse-bloom Mutants in Sorghum¹

The epicuticular wax exudate of sorghum [Sorghum bicolor (L.) Moench] is known as bloom and appears in three forms: bloom, sparse-bloom, and bloomless. Normal sorghum hybrids express the bloom phenotype. Mutant sources of sparse-bloom and bloomless have been discovered. To determine the number of gene loci that condition the sparse-bloom and bloomless phenotypes and to determine the relationship among these mutants, four sparse-bloom and five bloomless sorghum lines were crossed in various combinations, and in combination with two normal bloom lines.

Homozygous recessive alleles at two different loci conditioned the expression of bloomlessness. These genes were designated as bm₁ and bm₂. Expression of sparse-bloom was governed by homozygous recessive alleles at a minimum of three loci. These genes were designated h₁, h₂, and h₃. The bloomless and sparse-bloom genes were not allelic and segregated independently.

Sorghum breeders should develop parental lines containing the same bloomless or sparse-bloom genes to facilitate the production of bloomless or sparse-bloom hybrids.

Key Words: Sorghum bicolor (L.) Moench • Epicuticular wax • Waxy bloom • Genetics

² Graduate research assistant and former graduate student, Dep. of Agronomy; and professor, Dep. of Agronomy, respectively, Oklahoma State Univ., Stillwater, OK 74078.

Received for publication December 3, 1980.

This article has been cited by other articles:

				G. B. Burow, C. D. Franks, and Z. Xin Genetic and Physiological Analysis of an Irradiated Bloomless Mutant (Epicuticular Wax Mutant) of Sorghum Crop Sci., January 16, 2008; 48(1): 41 - 48. [Abstract] [Full Text] [PDF]