Role of Organic Acids in Sunflower Tolerance to Heavy Metals |
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Authors: | N.E. Saber A.M. Abdel-Moneim S.Y. Barakat |
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Affiliation: | (1) Botany Department, Faculty of Science, Alexandria University, Alexandria, 21526, Egypt |
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Abstract: | Exposure of Helianthus annuus L. seedlings to Al3+, Cd2+ or Zn2+ resulted in a marked decrease of fresh and dry masses of the shoots and the roots. The increase of Al3+, Cd2+ or Zn2+ uptake was accompanied by a significant decrease of nitrate, phosphorus and K+ uptake. There was a significant increase of malic and citric acid contents in the shoots and roots of heavy metal-treated seedlings whereas the change in fumaric acid was insignificant. Al3+ and Zn2+ alone stimulated excretion of malic and citric acids to the rhizosphere. Addition of high concentrations of malic or citric acid alleviate to some extent the inhibitory effect of Al3+ and Zn2+ on plant growth. This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | aluminium cadmium citric acid fumaric acid Helianthus annuus malic acid zinc |
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