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Plant Physiology 66:841-843 (1980)
© 1980 American Society of Plant Biologists

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Articles

Ethylene Production by Chilled Cucumbers (Cucumis sativus L.) 1

Chien Yi Wang and Douglas O. Adams

Horticultural Crops Quality and Postharvest Physiology Laboratories, Agricultural Research, Science and Education Administration, United States Department of Agriculture, Beltsville, Maryland 20705

Chilling at 2.5 C accelerated the synthesis of 1-aminocyclopropane-1-carboxylic acid (ACC) and C2H4 production in cucumber fruit. Skin tissue contained higher levels of ACC and was more sensitive to chilling than was cortex tissue. Accumulation of ACC in chilled tissue was detected after 1 day of chilling and remained elevated even after C2H4 production started to decline. These data suggest that ACC synthesis is readily stimulated by chilling, whereas the system that converts ACC to C2H4 is vulnerable to chilling injury. Chilling-induced C2H4 production was inhibited by amino-ethoxyvinylglycine, sodium benzoate, propyl gallate, 2,4-dinitrophenol, carbonyl cyanide m-chlorophenylhydrazone, and cycloheximide. The utilization of methionine for ACC formation and chilling-induced C2H4 biosynthesis was established using L-[3,4-14C]methionine. Chilled tissue had a higher capacity to convert L-[3,4-14C]methionine to ACC and C2H4 than did nonchilled tissue.

1 This research was conducted while D. O. Adams held a National Research Council Postdoctoral Research Associateship in the Postharvest Physiology Laboratory, Beltsville, Md.






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Copyright © 1980 by the American Society of Plant Biologists