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Zinc Concentration in Soybean as Related to Growth, Photosynthesis, and Carbonic Anhydrase Activity¹

The influence of Zn status on growth, photosynthesis, dark respiration, and carbonic anhydrase was determined to establish the relationship of these growth processes to the critical deficiency level (CDL) for growth of soybean (Glycine max (L.) Merr. cv ‘Bragg’). Soybean was grown in nutrient solution with Zn rates of 10, 20, 50, 100, 200, 500, and 1,000 µg Zn/liter for a period of 36 days after transplanting. Critical Zn deficiency level for top dry weight was determined as 12 µg/g dry weight in recently matured leaf tissue (blade 3 from the top). Maximum photosynthesis was associated with leaf blades containing also 12 µg/g. Zinc deficiency reduced photosynthesis and carbonic anhydrase activity. Minimum dark respiration was attained at the CDL for growth and severe Zn deficiency enhanced respiration.

Key Words: Critical Zn level • Glycine max.

² Associate professor of agronomy.

Received for publication February 14, 1977.

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