Abstract
The presence of atmospheric carbon dioxide supresses the light-dependent synthesis of proteinase Inhibitor I in leaves of intact, wounded tomato plants and in detached leaves induced with the proteinase inhibitor inducing factor, PIIF. In carbon dioxide-free air, or in 100% oxygen, the rate of synthesis of Inhibitor I is over two times the rate in the presence of normal air. The results suggest that either CO2 directly or through a product or products of photorespiration is regulating protein synthesis in tomato leaves.
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