期刊
NITRIC OXIDE-BIOLOGY AND CHEMISTRY
卷 11, 期 4, 页码 298-306出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.niox.2004.10.003
关键词
nitric oxide; fungal elicitor; Taxus cells; oxidative burst; K+/H+ fluxes; paclitaxel
This work was to characterize the generation of nitric oxide (NO) in Taxus chinensis cells induced by a fungal elicitor extracted from Fusarium oxysporum mycelium and the signal role of NO in the elicitation of plant defense responses and secondary metabolite accumulation. The fungal elicitor at 10-100 mug/ml (carbohydrate equivalent) induced a rapid and dose-dependent NO production in the Taxus cell culture, which exhibited a biphasic time course, reaching the first plateau within 1 h and the second within 12 h of elicitor treatment. The NO donor sodium nitroprusside potentiated elicitor-induced H2O2 production and cell death but had little influence on elicitor-induced membrane K+ efflux and H+ influx (medium alkalinization). NO inhibitors N-omega-nitro-L-arginine and 2-phenyl-4,4,5,5 -tetramethyl-imidazoline-1-oxyl-3-oxide partially blocked the elicitor-induced H2O2 production and membrane ion fluxes. Moreover, the NO inhibitors suppressed elicitor-induced activation of phenylalanine ammonium-lyase and accumulation of diterpenoid taxanes (paclitaxel and baccatin III). These results suggest that NO plays a signal role in the elicitor-induced responses and secondary metabolism activities in the Taxus cells. (C) 2004 Elsevier Inc. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据