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Cadmium toxicity is reduced by nitric oxide in rice leaves

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Abstract

We evaluate the protective effect of nitric oxide (NO) against Cadmium (Cd) toxicity in rice leaves. Cd toxicity of rice leaves was determined by the decrease of chlorophyll and protein contents. CdCl2 treatment resulted in (1) increase in Cd content, (2) induction of Cd toxicity, (3) increase in H2O2 and malondialdehyde (MDA) contents, (4) decrease in reduced form glutathione (GSH) and ascorbic acid (ASC) contents, and (5) increase in the specific activities of antioxidant enzymes (superoxide dismutase, glutathione reductase, ascorbate peroxidase, catalase, and peroxidase). NO donors [N-tert-butyl-α-phenylnitrone, 3-morpholinosydonimine, sodium nitroprusside (SNP), and ASC + NaNO2] were effective in reducing CdCl2-induced toxicity and CdCl2-increased MDA content. SNP prevented CdCl2-induced increase in the contents of H2O2 and MDA, decrease in the contents of GSH and ASC, and increase in the specific activities of antioxidant enzymes. SNP also prevented CdCl2-induced accumulation of NH4 +, decrease in the activity of glutamine synthetase (GS), and increase in the specific activity of phenylalanine ammonia-lyase (PAL). The protective effect of SNP on CdCl2-induced toxicity, CdCl2-increased H2O2, NH4 +, and MDA contents, CdCl2-decreased GSH and ASC, CdCl2-increased specific activities of antioxidant enzymes and PAL, and CdCl2-decreased activity of GS were reversed by 2-(4-carboxy-2-phenyl)-4,4,5,5-tetramethyl-imidazoline-1-oxyl-3-oxide, a NO scavenger, suggesting that protective effect by SNP is attributable to NO released. Reduction of CdCl2-induced toxicity by NO in rice leaves is most likely mediated through its ability to scavenge active oxygen species including H2O2.

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  1. Department of Agronomy, National Taiwan University, Taipei, Taiwan, Republic of China

    Yi Ting Hsu & Ching Huei Kao

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  1. Yi Ting Hsu
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Hsu, Y.T., Kao, C.H. Cadmium toxicity is reduced by nitric oxide in rice leaves. Plant Growth Regulation 42, 227–238 (2004). https://doi.org/10.1023/B:GROW.0000026514.98385.5c

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