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A Second-Axillary Flower Trait in Upland Cotton¹

A cotton (Gossypiura hirsutum L.) strain, "RQSX-I", was developed which consistently produces flowers at the second-axillary position. The purpose of this investigation was to determine the agronomic value of the trait, to study its production of flowers and fruit, and to estimate its inheritance.

A comparison of RQSXol with two cotton cultivars, ‘Tamcot CAMD-E’ and ‘Lankart 611’, showed that RQSX-l had smaller fruit, earlier maturity, its first fruiting branch at a lower node, more total fruiting positions, fewer fruiting branches, and more fruiting positions/fruiting branch than did either cultivar. It set more fruit than Lankart 611, but not than Tamcot CAMD-E. The inheritance study suggested that the development of the secondaxillary position was under quantitative genetic control.

Key Words: Gossypium hirsutum L. • Cotton genetics • Fruiting • Earliness

² Research geneticist, Southern Plains Cotton Res. Lab., USDA-ARS, and professor, Texas A&M Univ., Agric. Res. and Ext. Ctr., Route 3, Lubbock, TX 79401.

Received for publication May 15, 1981.