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Evaluation of Heat Shock and Salicylic Acid Treatments as Inducers of Drought Stress Tolerance in Hassawi Wheat

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Author(s): M.M. Azooz | M.M. Youssef

Journal: American Journal of Plant Physiology
ISSN 1557-4539

Volume: 5;
Issue: 2;
Start page: 56;
Date: 2010;
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Keywords: protein patterns | photosynthetic pigments | carbohydrates | Amino acids | proline

ABSTRACT
The present study was designed to evaluate the influence of salicylic acid (50 ppm) or/and heat shock on growth, some metabolic activities and protein patterns of Hassawi wheat (Triticum aestivum L. cv. Hassawi) plant. The experimental plant was subjected to three drought stress levels, 100, 60 and 30% field capacity. The results revealed that, there were no significant changes in dry weight and tissue water content in roots and shoots of Hassawi wheat at 60% field capacity, whereas they were significantly reduced at 30% field capacity. However, root/shoot dry weight ratio was increased by increasing of drought level. Drought stress especially at 30% field capacity induced a marked decrease in the content of photosynthetic pigments. The contents of soluble carbohydrate, protein and proline were significantly increased, while an opposite trend was obtained with respect to insoluble carbohydrates and proteins. The content of total free amino acids was significantly increased in roots, while it was decreased in shoots. Salicylic acid or/and heat shock treatments stimulated growth, photosynthetic pigments and accumulation of soluble and insoluble carbohydrates and proteins, but opposite effects were observed on the biosynthesis of free amino acids and proline. In addition to that, drought stress showed different de novo protein bands with different high molecular weights in plants treated or untreated with SA and heat shock either individually or in combination.
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