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Analysis of a Dominant Gene for Male-Sterility in Upland Cotton, Gossypium Hirsutum L.¹

Two male-sterile plants were found in the cotton (Gossypiutn hirsutum L.) variety ‘Acala 1517D’ in 1968. F₁ hybrids produced from these plants produced a 1:1 ratio of male-sterile to fertile plants. Self-pollinated seed from fertile plants produced all fertile offspring. Additional crosses made onto male-sterile plants continued to produce approximately a 1:1 ratio of male-sterile to fertile plants. A double haploid technique is proposed for producing homozygous dominant male-sterile plants. The gene symbol Ms₇ is proposed for this new dominant malesterile gene.

Key Words: Hybrid • Homozygous dominant male-sterile

² Assistant Professor of Agronomy and Assistant Professor of Botany, University of Georgia, Athens, Ga. 30601.

Received for publication February 1, 1971.