Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 13:40-44 (1973)
© 1973 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effects of Recurrent Seed Irradiation on Genetic Variability and Recombination in Cotton (Gossypium hirsutum L.)1

N. A. Fotiadis and P. A. Miller2

The effect of five cycles of seed irradiation with 10 kr of {gamma}-rays per cycle on the means, variances, and covariances of a synthetic variety of cotton (Gossypium hirsutum L.) was studied.

Means were lower after the treatment for the traits previously selected for high values and were higher for the traits previously selected for low values. Means of traits previously selected for intermediate values remained unaffected. Variances were generally but moderately increased. The effect on correlations between traits was rather small. Expected gains from selection were higher in the treated population, but the increased gain could hardly, if at all, compensate for the lower means of that population.

The changes effected by the treatment are deemed rather small. The reason is thought to be the low doses of radiation used.

Key Words: Mutation • {gamma}-rays

1 Contribution from the Department of Crop Science. Paper No. 3771 of the Journal Series of North Carolina State University Agricultural Experiment Station, Raleigh, N. C. Adapted from a thesis submitted by the senior author for partial fulfillment of the Ph.D. degree requirements.

2 Formerly Graduate. Student (present address, Forage. Crops Institute, LarIssa, Greece) and Professor of Crop Science, North Carolina State University, Raleigh. N. C. 27607.

Received for publication June 14, 1972.




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