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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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Authors


M.A. El-tayeb

Country: Egypt

A.E. El-Enany

Country: Egypt

N.l. Ahmed

Country: Egypt

Keywords


  • proline
  • Helianthus annuus
  • salicylic acid
  • organic solutes
  • photosynthetic pigments
  • Copper
Research Article

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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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

URL: https://scialert.net/abstract/?doi=ijb.2006.372.379

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