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Research Journal of Botany
Year: 2011  |  Volume: 6  |  Issue: 3  |  Page No.: 100 - 111

Modification of Photosynthetic Pigments, Osmotic Solutes and Ions Accumulation in Chlorella vulgaris and Wheat Cv. Sds-1 Seedlings under the Influence of NaCl with Salicylic Acids

A.M. Ismail, M.F. Abou Alhamd, H.R.M. Galal and F.A. Nasr-Eldeen    

Abstract: Previous studies have shown that salicylic Acid (SA) plays an important role in the response of plants to salt and osmotic stresses. Therefore this experiment was conducted to investigate the impact of exogenous salicylic acid (0.5 mM) on some metabolic activities of Chlorella vulgaris and wheat cv. Sds-1 seedlings under 0, 50, 100, 150, 200, 400 and 600 NaCl mM. There are a highly significant decrease in chlorophyll a (at all salinity levels) in wheat seedlings and chlorophyll b (above 50 mM NaCl) in tested Chlorella and wheat plants. Soluble carbohydrates in Chlorella and wheat reached a maximum value (53.833 and 78.190 mg, respectively) when treated with 0.5 mM SA. Under treatment of SA, the highest concentration of soluble protein in salinized Chlorella and wheat was (76.658 and 194.360 mg, respectively) and total free amino acids value was (16.353 mg) in Chlorella. Na+ concentration in Chlorella and wheat increased (up to 390 and 200%, respectively) higher than control at the highest NaCl concentration. An opposite trend for K+, Ca++ and Mg++ contents was obtained. The lowest value of Ca++ (61.5% reduction of the control) in two tested plants was observed at the highest salinity levels. K+ content in treated plants with SA increased (at all salinity levels) than control. The plants with SA may produce the required factors for plant protection that may reduce the harmful effects of NaCl.

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