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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; in revised form: 21 May 2012 / Accepted: 22 May 2012 / Published: 29 May 2012
Abstract: 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
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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.
Siddiqui MH, Al-Whaibi MH, Sakran AM, Basalah MO, Ali HM. Effect of Calcium and Potassium on Antioxidant System of Vicia faba L. Under Cadmium Stress. International Journal of Molecular Sciences. 2012; 13(6):6604-6619.
Siddiqui, Manzer H.; Al-Whaibi, Mohamed H.; Sakran, Ahmed M.; Basalah, Mohammed O.; Ali, Hayssam M. 2012. "Effect of Calcium and Potassium on Antioxidant System of Vicia faba L. Under Cadmium Stress." Int. J. Mol. Sci. 13, no. 6: 6604-6619.