Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 9:779-783 (1969)
© 1969 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Diallel Analyses of Yield and Other Agronomic Characters in Gossypium hirsutum L.1

K. M. Al-Rawi and R. J. Kohel2

Hayman's diallel cross analysis was employed to investigate the nature of the actions and interactions of genes involved in the inheritance of yield, its components, and other agronomic characters in Upland cotton (Gossypium hirsutum L.). Nine selected varieties, all possible F1 hybrid combinations among these varieties, and their corresponding F2's were grown in a split-plot design with four replications.

Heterosis was measured as the departure of the F1 from the average midparent value, and inbreeding depression was measured as the reduction of F2 below F1 performance. Both heterosis and inbreeding depression effects were small but significantly different from zero for all 11 characters studied.

Weight of lint per seed and number of nodes met all the assumptions required for the diallel analysis. However, overall epistasis was found in plant height, earliness, boll size, and number of bolls per plant. multiple allelism and possibly correlated gene distribution appeared to be present in days to first flower, seed index, lint percent, number of seeds per boll, and yield.

The diallel analysis revealed that all the characters were polygenetically inherited and exhibited partial dominance. The results also showed that heterosis was due to dominance or epistatic gene action, or both.

Key Words: Cotton • Heterosis • Inbreeding depression • Gene action

1 Cooperative investigations of the Texas Agricultural Experiment Station, and the Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture. Part of dissertation submitted to Texas A&M University by the senior author in partial fulfillment of the requirements for the Ph.D. degree.

2 Formerly Graduate Student, Soil & Crop Sciences Department, Texas A&M University (now, Dept. of Field Crops, Faculty of Agriculture and Veterinary Medicine, University of Mosul, Mosul, Iraq), and Research Geneticist, Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture, College Station, Texas 77843.

Received for publication May 9, 1969.


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