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Plant Physiology 51:19-21 (1973)
© 1973 American Society of Plant Biologists

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Articles

Wound-induced Proteinase Inhibitor in Tomato Leaves

Some Effects of Light and Temperature on the Wound Response 1

T. R. Green2 and C. A. Ryan3

a Department of Agricultural Chemistry, Washington State University, Pullman, Washington 99163

Wounding of single leaflets of young tomato (Lycopersicum esculentum var. Bonnie Best) plants causes the release of a proteinase inhibitor inducing factor. This factor is rapidly transported throughout the plant where it causes accumulation of inhibitor I, a potent inhibitor of several serine proteinases from both animals and microorganisms. The wound-induced accumulation of inhibitor I is both light- and temperature-dependent. In total darkness no accumulation results from wounding. The accumulation exhibits a linear dependence upon light up to 300 foot candles. At 600 foot candles and above, the response is maximal. In light the wound response possesses an unusual temperature dependence with an optimum rate of accumulation near 36 C. Below 20 C no accumulation occurs. The over-all process contains two light- and temperature-dependent steps, one involving wounding and transport, the other involving accumulation.

2 Present address: Department of Chemistry, University of California, Los Angeles, Calif. 90024.

3 Career Development Awardee of the United States Public Health Service; to whom reprint requests should be made.

1 This work was supported in part by United States Public Health Services Grant 2-K3-GM 17059 and by United States Department of Agriculture Cooperative State Research Service Grant 915-15-29. College of Agriculture Research Center Scientific Paper No. 3898, Project 1791.




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Copyright © 1973 by the American Society of Plant Biologists