Plant Physiol.
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Plant Physiology 45:484-489 (1970)
© 1970 American Society of Plant Biologists

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Articles

The Regulation of Synthesis and Storage of Chymotrypsin Inhibitor I in Leaves of Potato and Tomato Plants 1

C. A. Ryan2 and William Huisman

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

The synthesis and accumulation of chymotrypsin inhibitor I in tomato leaflets is induced by detachment, or by destruction of petiole phloem by steam when followed by incubation of the leaflets in light. The induction process with detached tomato leaflets is similar to that found with detached potato leaflets. The large amount of inhibitor I synthesized per leaflet cell per unit time suggests either that the structural gene is redundant or that an unusually stable messenger RNA is present. In both tomato and potato leaflets the accumulation of inhibitor I is potently inhibited by actinomycin D, puromycin, and cycloheximide, but not by chloramphenicol. Indoleacetic acid is moderately inhibitory, as is 3-(3,4-dichlorophenyl)-1,1-dimethylurea. Glutamine and asparagine are both markedly stimulating. The cumulative data suggest that inhibitor I is a major depot or interim storage protein and that its existence in any particular tissue is under complex controls by both the internal and external environments of the plants.

2 Research Career Development Awardee of the United States Public Health Service.

1 This work was supported in part by United States Public Health Service Grants 2K3GM17059 and GM12505 and by United States Department of Agriculture Grant 916-15-29. College of Agriculture Scientific Paper 3371, Projects 1791 and 1996.






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