There are considerable salt and drought affected areas in India. Further, the problems of salt and drought resis-tance in rice are of special importance in India, where the severity of the occu-rence of those environmental stresses are variable in nature. Soil moisture stress and salinity either singly or together, can be considered as a drought condition. The first one is recognised as physical drought while the latter one as physiological drought. When rice plants are subjected to these environmental stresses, they react to them, and some important structural changes result. The these environmental response to stresses can be profitably utilised to select promising rice varieties for drought and/or salt tolerance. Very little information is available on the structural variation of the rice plant grown under these conditions of environmental stressas. In the present investigation the structural changes in the stem of rice. plarits under the influence of salinity (15.5 millimhos/cm at 25°C) and drought (25-30 per cent soil moisture) have been studied, with a view to deter-mining the adaptive significance of such changes with a minimum of adverse effect.
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