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Plant and Cell Physiology Advance Access first published online on September 21, 2005
This version published online on September 29, 2005
Plant and Cell Physiology, doi:10.1093/pcp/pci202
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Plant and Cell Physiology 2005 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received June 12, 2005
Accepted September 11, 2005

Regular Paper

Nitric Oxide Reduces Aluminum Toxicity by Preventing Oxidative Stress in the Roots of Cassia tora L

You-Sheng Wang 1 and Zhi-Min Yang 1*

1 Department of Biochemistry and Molecular Biology, College of Life Science, Nanjing Agricultural University, Nanjing, China

* To whom correspondence should be addressed.
Zhi-Min Yang, E-mail: zmyang{at}njau.edu.cn


  Abstract

Nitric oxide (NO) as a key signaling molecule has been involved in mediation of various biotic and abiotic stress-induced physiological responses in plants. In the present study, we investigated the effect of NO on Cassia tora L. plants exposed to aluminum (Al). Plants pre-treated for 12 h with 0.4 mM sodium nitroprusside (SNP), a NO donor, and subsequently exposed 10 µM Al treatment for 24 h exhibited significantly greater root elongation as compared to the plants without SNP treatment. The NO-promoted root elongation was correlated with a decrease in Al accumulation in root apexes. Furthermore, oxidative stress associated with Al treatment increased lipid peroxidation and reactive oxygen species, and the activation of lipoxygenase and antioxidant enzymes was reduced by NO. Such effects were confirmed by the histochemical staining for the detection of peroxidation of lipids and loss of membrane integrity in roots. The ameliorating effect of NO was specific, because the NO scavenger cPTIO [2-(4-carboxy-2-phenyl)-4,4,5,5 -tetramethylinidazoline-1 -oxyl-3-oxide] completely reversed the effect of NO on root growth in the presence of Al. These results indicate that NO plays an important role in protecting the plant against Al-induced oxidative stress.

Keywords: nitric oxide; aluminum toxicity; oxidative stress; Cassia tora L.
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