FOLIAR APPLICATION OF SALICYLIC ACID REDUCED THE HARSH INFLUENCES OF WATER DEFICIT AND BIOCHEMICAL CONTENTS IN VARYING DEGREE IN SUNFLOWER

H.S. ZAIDI, A. WAHEED, J.UD. DIN, M. ARSHAD, A. RAZZAQ

Abstract


Water deficit is considered the most important restricted factor for plant products, in that several chemicals have been used to reduce the harmful effects of water stress. It is known that the role of salicylic acid (SA) is quite important in this mechanism. To study the effect of water deficit and four levels of salicylic acid (0, 0.375, 0.75 and 1.5 mM) on some biochemical criteria of three sunflower hybrids including tolerant (NX-19012, NX-00989) and sensitive (FH-352) at vegetative and flowering growth stages. Two  sets  of pots  were arranged  in  green  house,  water stress given to one set at vegetative stage and to second at flowering stage, and sprayed  with  SA.  Proline  and  Sugar  enhanced  significantly  under  drought conditions  and  further increased by the application of SA 0.75 mM. The decrease of protein indicated that water stress affected protein synthesis, but it was increased with the spray of SA. Tolerant hybrids produced better results than the sensitive. It seemed that SA had the ability to increase the tolerant ability of the plant to drought stress.

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