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Plant Physiology 65:884-887 (1980)
© 1980 American Society of Plant Biologists

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Articles

Stomatal Closure and Photosynthetic Inhibition in Soybean Leaves Induced by Petiole Girdling and Pod Removal 1

Tim L. Setter and William A. Brun

Mark L. Brenner

Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, Minnesota 55108, Department of Horticultural Science and Landscape Architecture, University of Minnesota, St. Paul, Minnesota 55108

The presence of strong sinks of photoassimilates is thought to stimulate photosynthesis by minimizing photosynthetic end product accumulation in leaves. This hypothesis was examined in soybeans (Glycine max [L] Merr.) with treatments designed to alter the phloem translocation of photoassimilates out of source leaves. Pod removal and petiole girdling resulted in 70 and 90% reductions, respectively, in leaf CO2 exchange rate. Reductions of similar magnitude also were observed in stomatal diffusive conductivity.

Time course data showed that CO2 exchange rates as well as stomatal conductivities were significantly reduced 0.5 hour after girdling and 5 hours after pod removal, thus suggesting that stomatal closure was the cause of the reduced rates of photosynthesis.

Mesophyll conductivities to CO2, calculated from gas exchange data, were not affected by the treatments. Radiocarbon assimilation rates by leaf slices floated in KH14CO3 solutions were not reduced by pod removal and were reduced only 10% by girdling. It was concluded that treatments which block or slow translocation from source leaves reduce their photosynthetic rate by inducing stomatal closure.

1 Contribution from the Agricultural Experiment Station, University of Minnesota, St. Paul, Minn. 55108. Paper No. 10,978, Scientific Journal Series. This research was supported in part by the Science and Education Administration of the United States Department of Agriculture under Grant 5901-0410-0183-0 from the Competitive Research Grants Office. This research was also supported in part by a Grant from the Minnesota Soybean Research and Promotion Council.




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