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Inheritance of an Apetalous, Male-sterile Character in Crimson Clover, Trifolium incarnatum L.¹

Inheritance of a male-sterile character in crimson clover was studied in the F₁, F₂, and F₃ generations. Sterility in this mutant was caused by the absence of anthers and was associated with multiple ovaries and absence of petals. These characteristics are apparently controlled by the same recessive gene pair with pleiotropic effects. Segregation of male-sterility in the F₂ and F₃ from heterozygous F₁ and F₂ plants gave a satisfactory fit to a ratio of 3 normal, fertile plants with petals and single ovaries to 1 male-sterile plant without petals and with multiple ovaries. This demonstrated the simple recessiveness of these characteristics. The following genetic symbols are proposed for this single recessive gene pair: Ms_lMs₁ for the normal, fertile, petalous, single. ovaried allele and ms_lms₁ for the male-sterile, apetalous, multiple-ovaried allele.

Key Words: Petalous • Crimson clover • Multiple ovaries

² Research Agronomist, Crops Research Division, ARS, USDA, State College, Miss. 39762

Received for publication July 25, 1968.