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Analysis of a Genetic Double Recessive Completely Male-Sterile Cotton¹

Genetic analysis of a male-sterile character in cotton (Gossypium hirsutum L.) showed that the male-sterile expression was conditioned by two pairs of homozygous recessive alleles. Tests of six varieties of cotton showed that they had a homozygous dominant constitution at the two loci. The varieties 'Lankart 57' and 'Gregg' apparently have homozygous dominant genes at only one of the two loci. It is proposed that the appearance of a single male-sterile plant from an F2 population of a cross involving Lankart 57 occurred as a gene mutation. Tests indicated that the genes at these two loci are independent of the previously reported ms₂ gene. The new genes have been assigned the symbol ms₅ and ms₆. This is the second published report of a complete male-sterile that is inherited as a recessive character and the first to be inherited as a double recessive.

Key Words: cytoplasmic-genetic sterility • glandless cotton • nectariless cotton • ratooning • hybrid cotton • gossypium hirsulum

² Formerly Research Agronomist, DeKalb Agricultural Association, Inc., Bogart, Ga., Presently Asst. Prof, of Agronomy, University of Georgia, Athens, Ga. 30601.

Received for publication January 29, 1970.