Paper Title:
Exogenous Nitric Oxide Reduces Cadmium Toxicity of Maize Roots
  Abstract

The effects of nitric oxide (NO) in protecting maize (Zea mays) roots against cadmium (Cd) toxicity were investigated. Maize seedlings pretreated for 24 h with 10-40 µM sodium nitroprusside (SNP), an NO donor, and subsequently exposed to 5 µM Cd for 24 h exhibited significantly greater root elongation as compared with the plants without SNP pretreatment. The pretreatment with 20 µM SNP alleviated Cd toxicity most obviously. SNP reduced Cd-induced accumulation of hydrogen peroxide (H2O2) and malonodialdehyde (MDA), which indicated NO alleviated Cd-induced oxidative damage. Cd treatment resulted in an upregulation of activities of superoxide dismutase (SOD), peroxidase (POD) and ascorbate peroxidase (APX) and the contents of glutathione (GSH) and ascorbate (ASC). Though SNP suppresses activities of POD, SOD and APX, it increases the production of non-enzymic antioxidants including glutathione (GSH) and ascorbate (ASC). The protective effect of SNP on Cd toxicity can be reversed by 2-(4-carboxy-2-phenyl)-4,4,5,5 -tetramethylimidazoline-1-oxyl-3-oxide (cPTIO), a NO scavenger, suggesting that the protective effect of SNP is attributable to NO released. These results suggest that NO plays an important role in protecting the plant against Cd-induced oxidative damage.

  Info
Periodical
Advanced Materials Research (Volumes 378-379)
Chapter
Chapter 3: Environmental and Materials
Edited by
Brendan Gan, Yu Gan and Y. Yu
Pages
409-413
DOI
10.4028/www.scientific.net/AMR.378-379.409
Citation
H. Y. Li, H. Shao, "Exogenous Nitric Oxide Reduces Cadmium Toxicity of Maize Roots", Advanced Materials Research, Vols. 378-379, pp. 409-413, 2012
Online since
October 2011
Export
Price
$32.00
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