Plant Physiol. Drug Metab Dispos
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Plant Physiology 76:1055-1059 (1984)
© 1984 American Society of Plant Biologists

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Articles

Effects of Chemical Treatments upon Photosynthetic Parameters in Soybean Seedlings

David T. Manning, Tsong Meng Chen1, Andrew J. Campbell, N. E. Tolbert and E. Wayne Smith2

Union Carbide Agricultural Products Company, Inc., P. O. Box 12014, Research Triangle Park, North Carolina 27709, Department of Biochemistry, Michigan State University, East Lansing, Michigan 48824

The effects of various chemical treatments upon photosynthesis, soluble leaf protein, CO2 compensation point, and leaf light transmission in soybean, Glycine max (L.) Merr., seedlings were examined following varying response periods after application at 14 to 17 days postemergence. The compounds N6-benzyladenine (BA), 2-(4-chlorophenoxy)-2-methylpropanoic acid (CPMP), (4-chlorophenoxy)acetic acid (CPA), rhodanine-N-acetic acid (RAA), and 2,3,5-triiodobenzoic acid (TIBA) significantly increased soluble protein and decreased senescence, measured by leaf light transmission, at CO2 concentrations below the compensation point in a survival chamber. All compounds except BA significantly decreased transmission values under ambient atmospheric conditions. In statistically significant experiments, applications of 3.49 millimolar CPMP increased net photosynthesis on a leaf area basis by an average of 14.4% at all trifoliolate positions with increases generally requiring response periods of 12 days or longer. RAA at 1.31 and 2.61 millimolar increased net photosynthesis by 19 to 36% following 13-day response periods. CPMP and other compounds tested had no effect upon the CO2 compensation point after 4- to 8-day response periods. The effects of CPMP and RAA upon net photosynthesis and soluble protein appeared to involve a combined stimulation of protein synthesis and an antisenescent effect. There were no indications that any of the photosynthetic changes observed resulted from direct differential effects upon ribulose bisphosphate carboxylase-oxygenase. The assays for soluble protein and light transmission responded more consistently to the chemicals than did photosynthesis.

1 Present address: FMC Corporation, P. O. Box 8, Princeton, NJ 08540.

2 Present address: Smith and Associates, 1014 S. 11th Avenue, St. Charles, IL 60174.






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Copyright © 1984 by the American Society of Plant Biologists