期刊
PLANT PHYSIOLOGY AND BIOCHEMISTRY
卷 42, 期 7-8, 页码 623-628出版社
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.plaphy.2004.06.010
关键词
alkaloids; Catharanthus roseus; ethylene; wounding
The effect of mechanical wounding on alkaloid metabolism was analyzed in Catharanthus roseus seedlings. Wounding induced an increase in ajmalicine accumulation, whereas catharanthine remained unaffected. A positive dual effect on vindoline was noticed. Short and mid-term effects were detected between 12 and 24 h after mechanical damage was inflicted, and apparently resulted from the accelerated transformation of the tabersonine intermediaries to vindoline. Long-term effects involved a generalized increase in carbon flux towards alkaloid synthesis. Exposure to ethylene (1 ppm) produced similar results to those observed in wounded seedlings, suggesting that it might be mediating the wound-induced increase in alkaloid synthesis. No synergistic or additive effects were observed when wounded seedlings were exposed to ethylene or jasmonate. (C) 2004 Elsevier SAS. All rights reserved.
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