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Abstract

A greenhouse experiment was conducted to assess whether gibberellic acid (GAi) could alleviate the adverse effects of salt stress on growth and ion accumulation of two spring wheat cultivars. Barani-83 (salt sensitive) and SARC-1 (salt tolerant). Three week-old plants of both the cultivars were exposed to 0. 100 and 200 mol m' NaCl in Hoagland's nutrient solution. After three weeks of initiation of salt treatments, half of the plants of each cultivar were sprayed fully with 100 mg L." GA, solution. Plant were harvested 3 weeks after the application of GAs. Fresh and dry weights of shoots and roots. plant height and leaf area were decreased with increasing supply of salt, but gibberellic acid treatment caused a signilicant ameliorative effect on both the cultivars with respect to these growth attributes. However. GA, caused a slight reduction in grain yield but increased grain size in both the cultivars. Saline growth medium caused a marked increase in the concentrations of Na" and Cl in shoots and roots of both the lines. However, with the application of GAs accumulation of Na" and Cl was enhanced in both shoots and roots of both wheat lines, but more ions accumulated in salt sensitive Barani-83 than in salt tolerant SARC-1. Overall, GA, treatment stimulated the vegetative growth of both cultivars of wheat under salt stress, but it caused a slight reduction in grain yield. GA, treatment enhanced. the accumulation of Na" and Clin both shoots and roots of wheat plants under salt stress.

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