DIFFERENTIAL CELL WALL RESPONSES TO SALINITY AND DROUGHT IN RICE (Oryza sativa L.)
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Date
2016-07-18
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
Plant response to drought stress is one of the most complex biological processes, and it involves numerous changes at the physiological, cellular, and molecular levels. Many genes have been identified to be involved in the response of drought stress in plants. The effect of drought on rice plants considerably varies with genotypes, developmental stages, and degree and duration of drought stress. A better understanding of the complex physiological mechanisms underlying drought response is important to improve rice yields under water-limited environments. Salinity on the other hand will create osmotic stress to the plant creating a physiological drought. The present study compares the effect of salinity and drought on five different varieties varying in their tolerance level towards these stresses. Chosen five varieties were grown in pipes at Department of Biotechnology, UAS, GKVK, Bangalore, during kharif 2016. ARB 6 which is an aerobic rice variety showed drought stress tolerance because of its longer roots, effective suberization and high passage cell density. Pokkali which is saline tolerant variety undergone extensive suberization in its root cells to cope up with the ionic stress. Kalanamak expressed saline tolerance by keeping its ionic concentration in cell sap low and moderate suberization and it performed well in moderate drought. Performance of Jaya and IR 20 in both salinity and drought stress was not promising.
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