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Effect of the Nectariless Trait on Cottonseed Protein and Amino Acid Composition¹

Nectariless cottons (Gossypium hirsutum L.) are potentially useful agronomicst rains of cotton. This experiment was conducted to compare the percent N of seed from nectariless cottons with that of seed from their nectaried recurrent parents. Two nectariless lines (‘DES DK he’ and ‘DES SL ne’) compared in 1969 and 1970 had higher seed percent N than their normal counterparts and one (‘DES 7A ne’) did not. In another experiment where eight BC₅F₄ ectariless lines were compared with their nectaried recurrent parents in 1974–75, there was no effect of the nectariless trait on seed percent N. There was, however, a significant cultivar by location interaction, indicating considerable influence of the environment on seed percent N. Aspartic acid, threonine, serine, glycine, and alanine contents were significantly higher in the seed from nectariless cotton lines than in seed from normal cotton. The increases in absolute percentage values were, respectively, 0.10, 0.04, 0.03, 0.05, and 0.04. While these values were statistically significant, they would be of little consequence in affecting the quality of protein in seed from nectariless cotton plants.

Key Words: Gossypium hirsutum L. • Isogenic • Genetic trait • Environmental effects • Nectary physiology

² Plant physiologist, research geneticist, and plant physiologist, Stoneville, Miss.; and area director, Alabama-North Mississippi Area, Mississippi State, Miss., respectively.

Received for publication February 25, 1977.