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International Journal of Botany
  Year: 2006 | Volume: 2 | Issue: 4 | Page No.: 372-379
DOI: 10.3923/ijb.2006.372.379
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Salicylic Acid-induced Adaptive Response to Copper Stress in Sunflower (Helianthus annuus L.)

M.A. El-tayeb, A.E. El-Enany and N.l. Ahmed

The ameliorative effect of salicylic acid (SA: 0.5 mM) under Cu stress (5 mg L–1) in sunflower (Helianthus annuus L.) was studied. Excess Cu reduced the fresh and dry weights of different organs (roots, stems and leaves) and photosynthetic pigments (chlorophyll a, b and carotenoids) in four-week-old plants. There was a considerable increase in Chl a/b ratio and lipid peroxidation in both the roots and leaves of plants under excess Cu. Soluble sugars and free amino acids in the roots also decreased under Cu stress. However, soluble sugars in the leaves, free amino acids in the stems and leaves and proline content in all the plant organs increased in response to Cu toxicity. Salicylic Acid (SA) significantly reduced the chlorophyll a/b ratio and the level of lipid peroxidation in Cu-stressed plants. Under excess Cu, a higher accumulation of soluble sugars, soluble proteins and free amino acids including proline occurred in plants treated with SA. Exogenous application of SA appeared to induce an adaptive response to Cu toxicity including the accumulation of organic solutes leading to protective reactions to the photosynthetic pigments and a reduction in membranes damage in sunflower.
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  •    Efficiency of Essential Oils, Citric Acid, Malic Aid and Nickel Reduced Ethylene Production and Extended Vase Life of Cut Lisianthus Flowers
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  •    Effect of Salicylic Acid, Malic Acid, Citric Acid and Sucrose on Antioxidant Activity, Membrane Stability and ACC-oxidase Activity in Relation to Vase Life of Carnation Cut Flowers
  •    Effect of Cobalt, Silicon, Acetylsalicylic Acid and Sucrose as Novel Agents to Improve Vase-life of Argyranthemum Flowers
How to cite this article:

M.A. El-tayeb, A.E. El-Enany and N.l. Ahmed, 2006. Salicylic Acid-induced Adaptive Response to Copper Stress in Sunflower (Helianthus annuus L.). International Journal of Botany, 2: 372-379.

DOI: 10.3923/ijb.2006.372.379






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