Nitric oxide reduces Cu toxicity and Cu-induced NH4+ accumulation in rice leaves
Resource
Journal of Plant Physiology 162 (12): 1319-1330
Journal
Journal of Plant Physiology
Pages
1319-1330
Date Issued
2005
Date
2005
Author(s)
Yu, Chia Chi
Hung, Kuo Tung
Kao, Ching Huei
Abstract
Nitric oxide (NO) is a highly reactive, membrane-permeable free radical, which has recently emerged as an important antioxidant. Here we investigated the protective effect of NO against the toxicity and NH4+ accumulation in rice leaves caused by excess CuSO4 (10 mmol L -1). It was found that free radical scavengers (sodium benzoate, thiourea, and reduced glutathione) reduced the toxicity and NH4 + accumulation in rice leaves caused by excess CuSO4. NO donor sodium nitroprusside (SNP) was also effective in reducing CuSO 4-induced toxicity and NH4+ accumulation in rice leaves. The protective effect of SNP on the toxicity and NH 4+ accumulation can be reversed by 2-(4-carboxy-2-phenyl)- 4,4,5,5-tetramethyl- imidazoline-1-oxyl-3-oxide, a NO scavenger, suggesting that the protective effect of SNP is attributable to NO released. Results obtained in the present study suggest that reduction of CuSO4-induced toxicity and NH4+ accumulation by SNP is most likely mediated through its ability to scavenge active oxygen species. © 2005 Elsevier GmbH. All rights reserved.
Type
journal article
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