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Published in Crop Sci 14:451-454 (1974)
© 1974 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Pregermination Treatments on Germination and Growth of Cottonseed at Suboptimal Temperatures1

D. F. Cole and J. E. Wheeler2

Various pregermination treatments were used to determine their effects on germination of cottonseed (Gossypium barbademe L.) at suboptimum temperatures and to determine whether chilling injury was reduced by these treatments.

‘Pima S-4’ cottonseed were preconditioned in water and gibbercllic acid (10-3M) at 10 and 30 C or in adenosine- 3':5'.cyclic monophosphate( cyclic AMP,10-4M) at 30 C, or were hot-water-treated at 70 C for 5 rain. After being preconditioned, seed were chilled for 24 hours at 5 C in water. Seed were germinated over a temperature range of 15.5 to 30 C for 7 days on a thermogradient plate. Germination counts were made daily. The speed and percent of germination were higher for seed preconditioned at 30 C than at 10 C. Hot-water treatment reduced the sensitivity of seed to gibberellic acid and reduced germination at all temperatures. Chilling injury was reduced by preconditioning in either water, gibberellic acid, or cyclic AMP. Our data suggest that satisfactory cotton stands may be obtained at suboptimum temperatures (below 31 C) by elevating seed moisture and/or treating with a growth regulator prior to planting.

Key Words: Seedling growth • Preconditioning • Chilling • Gibberellic acid • Cyclic AMP

1 Contribution from the Agricultural Marketing Research Institute, Agricultural Research Service, USDA, Beltsville, Maryland; and Department of Agronomy and Plant Genetics, University of Arizona, Tucson, Arizona. Arizona Experiment Station Paper No. 2131.

2 Presently Research Plant Physiologist, North Dakota State University, ARS, USDA, Fargo, ND 58102; and Plant Pathologist, American Consulate General, Recife (Pernambuco) APO, NY 09676.

Received for publication October 13, 1973.




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