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CPCSD Glandless Cotton Breeding Program

John Dobbs and Stephen R. Oakley


The glandless trait was discovered in the 1950's by Dr. Scott McMichael in the variety Hopi Moencopi. A glandless plant is essentially free of gossypol glands which normally cover cotton plants. These gossypol glands contain gossypol, a poisonous compound. Genetically the glandless trait is controlled by two recessive genes, gl2 and gl3. When a plant is homozygous for gl2 and gl3, all gossypol glands in the aerial plant and seeds are eliminated. The gossypol in these glands is poisonous to non-ruminant animals. Cottonseed that is free of gossypol is an excellent source of protein for both animal and human consumption. The glandless trait was used by cotton breeders at the U.S.D.A. Cotton Research Station in Shafter for many years to develop lines with good yield and fiber quality. In 1978, the California Planting Cotton Seed Distributors (CPCSD) started a glandless breeding program utilizing the lines developed at the U.S.D.A. Shafter Station. CPCSD is owned and directed by the cotton growers in the San Joaquin Valley (SJV). Our interest is producing adapted high quality commercial glandless Acala varieties that may well be a source of added income for the SJV cotton growers.

Reprinted from Proceedings of the 1998 Beltwide Cotton Conferences pp. 556 - 557
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998