Oxidative damages induced by short-term exposure to cadmium in bean plants: Protective role of salicylic acid

Title 
Oxidative damages induced by short-term exposure to cadmium in bean plants: Protective role of salicylic acid 
Publication Type 
Journal Article 
Authors 
Saidi I, Ayouni M, Dhieb A, Chtourou Y, Chaïbi W, Djebali W 
Year of Publication 
2013 
Volume 
85 
Journal 
South African Journal of Botany 
Pagination 
32 - 38 
Date Published 
3/2013 
ISSN 
02546299 
Keywords 
Antioxidants, Beans, Cadmium, Oxidative damages, Phaseolus vulgaris, Salicylic acid 
URL 
http://www.sciencedirect.com/science/article/pii/S0254629912001871 
DOI 
10.1016/j.sajb.2012.12.002 
Abstract 

The role of salicylic acid (SA) in alleviating cadmium (Cd) toxicity was investigated in a hydroponic cultivation system. Short-term exposure of bean (Phaseolus vulgaris) plants to 20 μM Cd inhibited biomass production and intensively increased accumulation of Cd in both roots and leaves. At leaf level, Cd significantly decreased mineral ions, chlorophyll and carotenoids concentrations. Concomitantly, Cd enhanced electrolyte leakage, H2O2 content and lipid peroxidation as indicated by malondialdehyde (MDA) accumulation. SA pretreatment decreased the uptake and the transport of Cd, alleviated the Cd-induced inhibition of nutrient absorption and led to a significant increase of chlorophyll and carotenoid content. SA application alleviated the oxidative damages as evidenced by the lowered H2O2 and MDA content. SA particularly induced an increase in both CAT and APX activities accompanied by a significant reduction in SOD and POD activities. As important antioxidants, ascorbate and glutathione contents in bean leaves exposed to cadmium were significantly decreased by SA treatment. These results reveal the potentiating effect of salicylic acid in regulating cadmium induced oxidative stress in bean plants.
Highlights

  • Characterize the toxic mechanism associated with short-term Cd exposure in bean plant leaves
  • Understand the interactions between cadmium and plant
  • Investigate whether SA pretreatment could efficiently protect against Cd-induced oxidative damages and plant tolerance
 
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