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Molecular Biology and Gene Regulation

Ethylene Directly Inhibits Foliar Gas Exchange in Glycine max¹

Environmental Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6034

Gas exchange of individual attached leaves of soybean, Glycine max (L.) Merr cv Davis, was monitored during exposure to exogenous ethylene (C₂H₄) to test the hypothesis that the effects of C₂H₄ on net photosynthesis (P_N) and stomatal conductance to H₂O vapor (g_s) are direct and not mediated by changes in leaf orientation to light. Leaflets were held perpendicular to incident light in a temperature-controlled cuvette throughout a 5.5 hour exposure to 10 microliters per liter C₂H₄. Declines in both P_N and g_s were evident within 2 hours and became more pronounced throughout the exposure period. In C₂H₄ treated plants, P_N and g_s decreased to 80 and 62%, respectively, of the rates in control plants. Because epinastic movement of the leaflets was prohibited by the cuvette, the observed declines in P_N and g_s were a direct effect of C₂H₄ rather than the result of reduced light interception caused by changing leaf angle.

¹ Research sponsored by the Ecological Research Division, Office of Health and Environmental Research, U.S. Department of Energy, under contract DE-AC05-84OR21400 with Martin Marietta Energy Systems, Inc. Publication No. 3583, Environmental Sciences Division, Oak Ridge National Laboratory.

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