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Photosynthetic Rates and Light Saturation Curves of Individual Soybean Leaves Under Field Conditions¹

The effects of leaf age and light acclimation on apparent photosynthesis (AP) rates of single attached leaves of highly productive, field-grown, ‘Wayne’ soybeans (Glycine max L. Merr.) were determined. AP measurements were made on leaves at nodes along the main stem of plants 5 cm apart in 76-cm rows (normal canopy plants) and on leaves at different nodes of widely spaced (76 cm x 76 cm) plants without branches. The response to light in the range of 2,000 to 15,000 ft-c of fully expanded leaves of the two types of plants was also measured.

The AP rates of upper and lower leaves of the normal canopy plants averaged 33 and 20 mg CO₂/dm²/hour, respectively. AP rates of upper and lower leaves of spaced plants were equal and averaged 50 mg CO₂/dm²/hour. Leaves from the upper part of normal, field-grown canopy plants became light saturated at 10,000 ft-c but the leaves of spaced plants were not light saturated at 15,000 ft-c.

Key Words: Leaf age • Photosynthesis • Light response

² Assistant Professor of Extension, Ohio State University and Professor of Agronomy, University of Wisconsin. First author was formerly a research assistant, Department of Agronomy, and second author was formerly Professor of Agronomy, University of Illinois.

Received for publication June 27, 1970.

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