期刊
JOURNAL OF PLANT PHYSIOLOGY
卷 166, 期 1, 页码 63-71出版社
ELSEVIER GMBH
DOI: 10.1016/j.jplph.2008.02.004
关键词
Cocos nucifera; Cell cultures; p-Hydroxybenzoic acid; p-Hydroxy-benzaldehyde dehydrogenase; Phenylalanine ammonia tyase
Chitosan-induced elicitation responses of dark-incubated Cocos nucifera (coconut) endosperm cell suspension cultures led to the rapid formation of phenylpropanoid derivatives, which essentially mimics the defense-induced biochemical changes in coconut palm as observed under in vivo conditions. An enhanced accumulation of p-hydroxybenzoic acid as the major wall-bound phenolics was evident. This was followed by p-coumaric acid and ferulic acid. Along with enhanced peroxidases activities in elicited lines, the increase in activities of the early phenylpropanoid pathway enzymes such as, phenylalanine ammonia lyase (PAL), p-coumaroyl-CoA ligase (4CL) and p-hydroxybenzaldehyde dehydrogenase (HBD) in elicited cell cultures were also observed. Furthermore, supplementation of specific inhibitors of PAL, C4H and 4CL in elicited cell cultures led to suppressed accumulation of p-hydroxybenzoic acid, which opens up interesting questions regarding the probable route of the biosynthesis of this phenolic acid in C. nucifera. (c) 2008 Elsevier GmbH. All rights reserved.
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