Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 17:342-344 (1977)
© 1977 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Cottonseed Germination Related to DNA Synthesis Following Chilling Stress1

Willard F. Clay, D. R. Buxton and Frank R. H. Katterman2

Identification of cotton (Gossypium spp.) seed lots that establish uniform stands has been inconsistent with the standard germination test, especially when soil temperatures are low. To aid in developing better predictive tests, critical biological processes associated with seed germination at low temperatures need to be better understood. This study was conducted to evaluate the relationship between DNA synthesis and seed performance. Pima cottonseed (G. borbadense L.) lots were evaluated during 3 years of experimentation for field emergence, germination percentage at both 15 and 25 C, and capacity to synthesize DNA during germination following a chilling stress. DNA synthesis was positively correlated with seed germination percentage at both temperatures, with the closest association occurring at 15 C when a large number of seed lots were evaluated. The DNA test was more consistently correlated with field emergence than percent germination. These results show that capacity to synthesize DNA following chilling is an important process associated with seed germination and emergence during low soil temperatures.

Key Words: Gossypium barbadense L. • Chilling stress • Seedling emergence • Standard germination test • Deoxyribonucleic acid

1 Contribution for the Arizona Agric. Exp. Stn. as Technical Paper No. 2642. Supported in part by funding from the SuPima Assoc. of America.

2 Research associate, associate professor, and professor, Dep. of Plant Sciences, Univ. of Arizona, Tucson, AZ 85721.

Received for publication July 29, 1976.




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Copyright © 1977 by the Crop Science Society of America.