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Plant Physiology 60:402-406 (1977)
© 1977 American Society of Plant Biologists

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Articles

Methionine-induced Ethylene Production by Penicillium digitatum1

Edo Chalutza,2 and Morris Liebermana

Hugh D. Sislerb

a Post Harvest Plant Physiology Laboratory, Beltsville Agricultural Research Center, Beltsville, Maryland 20705, Department of Botany, University of Maryland, College Park, Maryland 20742

Shake cultures, in contrast to static cultures of Penicillium digitatum grown in liquid medium, were induced by methionine to produce ethylene. The induction was concentration-dependent, and 7 mM was optimum for the methionine effect. In the presence of methionine, glucose (7 mM) enhanced ethylene production but did not itself induce ethylene production. The induction process lasted several hours, required the presence of viable mycelium, exhibited a lag period for ethylene production, and was effectively inhibited by cycloheximide and actinomycin D. Thus, the methionine-induced ethylene production appeared to involve induction of an enzyme system(s). Methionine not only induced ethylene production but was also utilized as a substrate since labeled ethylene was produced from [14C]methionine.

Following induction by the fungus, filtrates of induced shake cultures also evolved ethylene in increasing amounts by both enzymic and monenzymic reactions. Tracer experiments indicated that the ethylene released by the filtrate was derived from a fungal metabolite of methionine and not directly from methionine.

2 On leave from The Agricultural Research Organization, The Volcani Center, Bet-Dagan, Israel.

1 This work was supported by the Agricultural Research Service and the University of Maryland in Cooperative Agreement No. 12-14-1001-799.






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Copyright © 1977 by the American Society of Plant Biologists