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Enhancement by Ethylene of Cellulysin-Induced Ethylene Production by Tobacco Leaf Discs ¹

Plant Hormone Laboratory, PPHI, Beltsville Agricultural Research Center-West, United States Department of Agriculture, Beltsville, Maryland 20705, University of Maryland, College Park, Maryland 20742

Cellulysin-induced ethylene production in tobacco (Nicotiana tabacum L.) leaf discs was enhanced several-fold by prior exposure of the leaf tissue to ethylene. This enhancement in the response of the tissue to Cellulysin increased rapidly during 4 and 8 hours of pretreatment with ethylene and resulted from greater conversion of methionine to ethylene. On treatment with Cellulysin, the content of 1-aminocyclopropane-1-carboxylic acid (ACC) in leaf discs not pretreated with ethylene markedly increased while that of the ethylene-pretreated tissue was only slightly higher than in the tissue incubated in the absence of Cellulysin. Ethylene-treated tissue, however, converted ACC to ethylene at a faster rate than air controls. These data indicate that ethylene stimulates Cellulysin-induced ethylene production by stimulating the conversion of ACC to ethylene. Data are also presented on a possible relation of this phenomenon to ethylene produced by the tobacco leaf upon interaction with its pathogen, Alternaria alternata.

¹ Supported in part by a grant from the United States-Israel Binational Agricultural Research and Development Fund (BARD). This work was carried out under the Cooperative Agreements No. 58-32U4-1-216 and 58-32U4-2-394 of the United States Department of Agriculture, Agricultural Research Service and the University of Maryland.

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