Gossypol and gossypurpurin in cottonseed of different varieties of G. barbadense and G. hirsutum, and variation of the pigments during storage of the seed

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Abstract
Summary: Selected varieties of cottonseed comprising three Sea Island cottons, four Egyptian cottons, and 10 upland cottons providing two or more varieties having the following characteristics: short, intermediate, and long staple; low, intermediate, and high content of lipids; and low, intermediate, and high content of protein, were planted and grown under as nearly identical conditions as possible.The initial contents of moisture, lipids, nitrogen, gossypol, and gossypurpurin of the harvested seed were determined, after which samples of all of the seed were stored for a year under identical conditions and analyzed periodically for gossypol and gossypurpurin.A definite relation was found between the species of the seed and their content of gossypol and gossypurpurin. Sea Island and Egyptian seed of the speciesG. barbadense contained more gossypol and very much more gossypurpurin than seed of the speciesG. hirsutum. Within the speciesG. barbadense Sea Island seed contained more gossypol and less gossypurpurin than Egyptian seed.Gossypurpurin increased during storage of all of the seed whereas gossypol varied in a number of different ways, increasing in some, decreasing in others, and remaining relatively constant in a few samples of stored seed.A discussion is presented of the theoretical and practical implications of these observations.

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