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This article in CS

  1. Vol. 11 No. 2, p. 217-219
    Received: June 27, 1970

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

  1. J. E. Beuerlein and
  2. J. W. Pendleton2



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 ✕ 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.

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