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Int. J. Mol. Sci. 2012, 13(6), 6604-6619; doi:10.3390/ijms13066604

Effect of Calcium and Potassium on Antioxidant System of Vicia faba L. Under Cadmium Stress

Department of Botany and Microbiology, College of Science, King Saud University, Riyadh, Saudi Arabia
Author to whom correspondence should be addressed.
Received: 5 April 2012 / Revised: 21 May 2012 / Accepted: 22 May 2012 / Published: 29 May 2012
(This article belongs to the Special Issue Oxidative Stress and Ageing)
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Cadmium (Cd) in soil poses a major threat to plant growth and productivity. In the present experiment, we studied the effect of calcium (Ca2+) and/or potassium (K+) on the antioxidant system, accumulation of proline (Pro), malondialdehyde (MDA), and content of photosynthetic pigments, cadmium (Cd) and nutrients, i.e., Ca2+ and K+ in leaf of Vicia faba L. (cv. TARA) under Cd stress. Plants grown in the presence of Cd exhibited reduced growth traits [root length (RL) plant−1, shoot length (SL) plant−1, root fresh weight (RFW) plant−1, shoot fresh weight (SFW) plant−1, root dry weight (RDW) plant−1 and shoot dry weight (SDW) plant−1] and concentration of Ca2+, K+, Chlorophyll (Chl) a and Chl b content, except content of MDA, Cd and (Pro). The antioxidant enzymes [peroxidase (POD) and superoxide dismutase (SOD)] slightly increased as compared to control under Cd stress. However, a significant improvement was observed in all growth traits and content of Ca2+, K+, Chl a, Chl b ,Pro and activity of antioxidant enzymes catalase (CAT), POD and SOD in plants subjected to Ca2+ and/or K+. The maximum alleviating effect was recorded in the plants grown in medium containing Ca2+ and K+ together. This study indicates that the application of Ca2+ and/or K+ had a significant and synergistic effect on plant growth. Also, application of Ca2+ and/or K+ was highly effective against the toxicity of Cd by improving activity of antioxidant enzymes and solute that led to the enhanced plant growth of faba bean plants.
Keywords: antioxidant; faba bean; heavy metal; nutrient content; photosynthetic pigments antioxidant; faba bean; heavy metal; nutrient content; photosynthetic pigments
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Siddiqui, M.H.; Al-Whaibi, M.H.; Sakran, A.M.; Basalah, M.O.; Ali, H.M. Effect of Calcium and Potassium on Antioxidant System of Vicia faba L. Under Cadmium Stress. Int. J. Mol. Sci. 2012, 13, 6604-6619.

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