POLYAMINES IN PLANTS INFECTED BY CITRUS-EXOCORTIS VIROID OR TREATED WITH SILVER IONS AND ETHEPHON

被引:31
作者
BELLES, JM
CARBONELL, J
CONEJERO, V
机构
[1] UNIV POLITECN VALENCIA, DEPT BIOTECNOL, BIOQUIM & BIOL MOLEC LAB, E-46022 VALENCIA, SPAIN
[2] CSIC, INST AGROQUIM & TECNOL ALIMENTOS, E-46010 VALENCIA, SPAIN
关键词
D O I
10.1104/pp.96.4.1053
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
The levels of polyamines in leaves of Gynura aurantiaca DC and tomato, Lycopersicon esculentum Mill. cv Rutgers, infected with citrus exocortis viroid (CEVd) or treated with silver nitrate or ethephon (2-chloroethylphosphonic acid) were measured by HPLC in relation to development of symptoms. Previously it had been demonstrated that treatment of G. aurantiaca plants with silver nitrate or ethephon closely mimicked the effects of viroid infection in the plants. In the studies reported here, a marked decrease in putrescine level was observed in plants infected by CEVd or treated with silver ions or ethephon. There was no significant change in either spermidine or spermine levels. Treatment of G. aurantiaca plants with specific inhibitors of ethylene biosynthesis (aminoethoxyvinylglycine, Co2+) or ethylene action (norbornadiene) prevented the decrease of putrescine associated with silver nitrate treatment and had no effect on spermidine or spermine levels. The development of viroid-like symptoms, the production of associated pathogenesis-related proteins, and the rise in protease activity induced by silver nitrate, were all suppressed by exogenous application of putrescine. The decreased level of putrescine as an ethylene-mediated step in the transduction of the viroid and silver or ethephon signaling is discussed.
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收藏
页码:1053 / 1059
页数:7
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