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Published in Crop Sci 18:799-801 (1978)
© 1978 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Natural Selection in a Bulked Hybrid Population of Upland Cotton1

J. E. Quisenberry, Bruce Roark, J. D. Bilbro and L. L. Ray2

A bulked hybrid population of upland cotton (Gossypium hirsutum L.) was grown without artificial selection for 10 generations in a nonirrigated, semiarid nursery at Lubbock, Texas. In 1972 and 1976, seeds from all generations were grown in replicated tests to estimate the effects of natural selection on several traits in the population and to compare the responses of seed trait to the more vauable traits of lint yield and fiber quality. Traits measured were seeds/in, seeds/boll, seed size, lint yield, fiber length, strength, and micronaire. Data were evauated by anaysis of variance and regression techniques. Seeds/m, lint yield, and coarseness of the fiber increased while seed size and fiber strength decreased over the 10 generations. Significant differences were not detected for seeds/boll or fiber length. Bulk population breeding appeared to be a useful method for improving climatic adaptation of upland cotton in environments where moisture is limiting.

Key Words: Gossypium hirsutum L. • Bulk population breeding • Lint yield • Seed traits • Fiber properties

1 Cooperative investigations of the SEA, USDA, and the Texas Agric. Exp. Stn.

2 Research geneticist, plant physiologist, and research agronomist, Cotton Production Laboratory, Oklahoma-Texas Area, Southern Region, SEA, USDA; and professor, Texas Agric. Exp. Stn., Texas A&M Univ. Research and Extension Center, Route 3, Lubbock, TX 79401

Received for publication February 9, 1978.




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