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Published in Crop Sci 9:323-328 (1969)
© 1969 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Varietal Effects in Soybean Photosynthesis and Photorespiration1

P. E. Curtis, W. L. Ogren and R. H. Hageman2

The rate of photosynthesis for seedlings of 36 varieties of soybean [Glycine max (L.) Merrill] ranged from 12 mg CO2 assimilated dm–2 hr–1 in ‘Patterson’ to 24 mg CO2 dm–2 hr–1 in ‘Richland’ at saturating light intensity, determined to be 43 kilolux. Comparing the photosynthetic rate and average seed yield of several varieties indicates that varietal yield differences are not caused by differences in photosynthetic rate, although in some instances yield can be related to total photosynthate production. The photosynthetic rate of ‘Wayne’ seedlings was identical when grown in vermiculite, in sterilized soil, or in soils of medium and high productivity.

The photosynthetic rates in air are 5 to 6 mg CO2 dm–2 hr–1 less than the rates obtained in a low oxygen atmosphere. Calculations based on photosynthetic rates and compensation points indicate that slightly more than onehalf of the decrease in photosynthesis in air is due to photorespiration, and that the remainder is due to an oxygen inhibition of photosynthesis. The compensation point at 43 kilolux was approximately 40 ppm CO2 for all varieties tested. Analysis of leaf extracts for glycolate oxidase activity indicated no correlation with photorespiratory activities, suggesting that although this enzyme may be required for photorespiration, it is not the limiting factor.

Key Words: Glycine max (L.) Merrill • Compensation point • Glycolate oxidase • Oxygen inhibition of photosynthesis

1 Joint contribution from the Department of Agronomy, University of Illinios, and the Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture. Manuscript No. 536 of the U. S. Regional Soybean Laboratory, Urbana, Illinois 61801. Supported in part by Agricultural Research Service, U. S. Department of Agriculture CSRS grant 716-15-10, administered by the Crops Research Division, Beltsville, Maryland.

2 Fellow in Agronomy; Plant Physiologist, Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, Urbana, Illinois, and Assistant Professor of Plant Physiology, Department of Agronomy, University of Illinois; and Professor of Plant Physiology, Department of Agronomy, University of Illinois, Urbana 61801.

Received for publication October 9, 1968.


This article has been cited by other articles:


Home page
 Agron. J.Home page
M. J. Morrison, H. D. Voldeng, and E. R. Cober
Physiological Changes from 58 Years of Genetic Improvement of Short-Season Soybean Cultivars in Canada
Agron. J., July 1, 1999; 91(4): 685 - 689.
[Abstract] [Full Text] [PDF]


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