TITLE	Excess copper induces an accumulation of putrescine in rice leaves
AUTHOR	Chuan Chi Lin Department of Agronomy, National Taiwan University, Taipei, Taiwan, Republic of China Ching Huei Kao Department of Agronomy, National Taiwan University, Taipei, Taiwan, Republic of China
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ABSTRACT	The effect of excess Cu2+ (sulfate salt) on putrescine (Put) accumulation in detached rice leaves was investigated. Cu2+ treatment increased Put concentrations in rice leaves under both light and dark conditions. This increase was more pronounced in the light than in the dark, suggesting the importance of illumination in Cu2+-induced accumulation of Put in detached rice leaves. The photosynthetic electron transport inhibitor 3-(3,4-dichlorophenyl)-1,1-dimethylurea reduced Put accumulation induced by Cu2+ in the light. In darkness, Cu2+-induced Put accumulation was more effective in the presence of glucose or sucrose than in their absence. In the light, Cu2+ also induced Put accumulation in six other rice cultivars. D-Arginine and a-methylornithine decreased concentrations of Put induced by Cu2+, indicating that Cu2+ may affect the activities of both arginine decarboxylase and ornithine decarboxylase, enzymes responsible for the biosynthesis of Put.
KEYWORD	Copper; Putrescine; Oryza sativa;
ARTICLE INFO	Botanical Bulletin of Academia Sinica, Volume 40 Number 3 July 1999, page 213-218, 6 pages
PUBLISHER	Institute of Plant and Microbial Biology, Academia Sinica, Taipei, Taiwan, Republic of China