Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 18:577-580 (1978)
© 1978 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Genetic Variation Within Cotton For Seed N and Amino Acid Content1

William R. Meredith, Jr., C. D. Elmore and E. E. King2

The objective of this study was to investigate the genetic variability for seed N and amino acid content among currently available cottons (Gossypium hirsutum L.). In 1974 and 1975, 35 cultivars and strains were grown in two replications at Stoneville, Miss. Significant genetic variability was detected for N and eight amino acids in dehulled cottonseed. Seed N ranged from 5.0% for ‘Delfos 9169’ to 6.1% for ‘Q1’. Significant genotype x year interactions were detected for lysine, histidine, and phenylalanine. Significant phenotypic correlations of N with lysine, threonine, glycine, alanine, and leucine were –0.36, –0.85, –0.66, –0.72, and –0.64 respectively. Genotypic correlations were generally of the same sign and magnitude as the phenotypic correlations.

Results of the study indicated a modest amount of genetic variability within G. hirsutum for N and amino acid content. Old cultivars and new strains originating from interspecific hybridizations appeared to be the most promising sources for useful breeding material. There were little differences in N and amino acid contents among the commonly used cultivars regardless of their geographic use patterns.

Key Words: Cotton breeding • Genetic diversity • Cottonseed protein • Cottonseed quality

1 Contribution from SEA, USDA, Stoneville, Miss, in cooperation with the Mississippi Agric. and For. Exp. Stn.

2 Research geneticist and plant physiologists. Cotton Physiology and Genetics Laboratory, U. S. Delta States Agric. Res. Ctr. Stoneville, MS 38776.

Received for publication January 3, 1978.




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