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Some Chemical Properties of Hybrid Seed from a Cross Between Gossypium barbadense L. and Gossypium davidsonii Kell¹

The diploid species Gossypium davidsonii Kell., has a slightly higher level of lysine in the seed than the tetraploid cultivated species, Gossypium hirsutum L and Gossypium barbadense L. It also has much more gossypol in the seed than either of the cultivated forms. Seed from a cross of G. davidsonii (as male) with a glandless accession of G. barbadense (as female) contained no more lysine than the female parent. Most of the other amino acids were, quantitatively, nearer the female parent than the male, and gossypol level was less than one-third that of G. davidsonii. The data suggest that G. davidsonii will not be of much value for improving the protein composition of cultivated cottons, but might contribute some increase in gossypol where this substance is needed to control bollworms (Heliothis spp.)

Key Words: Charater substitution • Gossypol level

² Geneticist, Crops Research Division, ARS, USDA, and Professor of Nutritional Biochemistry, North Carolina Agr. Exp. Sta. respectively. This investigation was supported in part by Public Health Services Grant AM 07039 from the Institute of Arthritis and Metabolic Diseases.

Received for publication January 5, 1970.