Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 83:467-468 (1987)
© 1987 American Society of Plant Biologists

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Development and Growth Regulation

Soybean Seed Growth in Response to Long-Term Exposures to Differing Oxygen Partial Pressures

Thomas R. Sinclair, Judith P. Ward and Carolyn A. Randall

Environmental Physiology Project, United States Department of Agriculture, Agricultural Research Service, Bldg. 164, University of Florida, Gainesville, Florida 32611, Agronomy Department, University of Florida, Gainesville, Florida 32611

Short-term studies have indicated that alterations in the oxygen partial pressure (pO2) around developing soybean (Glycine max [L.] Merr.) seeds may alter seed growth characteristics. A 2-year field study was undertaken to determine the effects on seed development of long-term exposures of individual pods to either sub-ambient or supra-ambient pO2. Pod chambers were used through which fixed pO2 were continuously flowed throughout seed development. No effects on maturity date were observed from exposures to either sub-ambient or supra-ambient pO2. On the other hand, seed weight was reduced by 0.10 pO2 in both years of the study implicating an O2 limitation on seed growth rate at this fairly high pO2. In 1 of the 2 years, supra-ambient pO2 resulted in increased seed weight.




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Copyright © 1987 by the American Society of Plant Biologists