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Influence of Lint Percentage, Boll Size, and Seed Size on Lint Yield of Upland Cotton with High Fiber Strength¹

Our major objectives in breeding cotton (Gossypium hirsutum L.) have been to change negative genetic associations between lint yield and fiber strength, and lint yield and length. We also find an association between low lint percentage and extra-long (above 35 mm) fiber length. With the introduction of the C 6-5 breeding line into the cotton breeding program at the Pee Dee Exp. Stn. in South Carolina in 1955, the latter association was broken.

Through a program of hybridization and selection, lint percentage and lint yield of the PD fines were raised 5 and 12%, respectively. The introduction of C 6-5 germplasm was accompanied by increases in seed and boll size. The selection of the line, AC 241, caused a reduction in boll and seed size; however, this line has fruit and seeds somewhat larger than desired. We are currently pursuing a program to reduce boll and seed size through hybridization of PD lines with southeastern commercial cottons.

Key Words: Gossypium hirsutum L. • Yield components • Linkage • Breeding • Selection

² Research agronomists, ARS-USDA, Pee Dee Exp. Stn., Florence, SC 29501.

Received for publication January 20, 1975.

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