Abstract Crop plant experiences water stress either when the water supply to roots becomes difficult or when the transpiration rate becomes very high. Available water resources for successful plant production have been decreasing in recent years. Furthermore, in view of various climatic change models scientists suggested that in many regions of world, plant losses due to increasing water shortage will further aggravate its impacts. In many observed cases chlorophyll content declines under drought stress conditions. Potato leaves show a significant decline in chlorophyll content with increasing drought stress. Under water stress, the maintenance of leaf turgor may also be achieved by the way of osmotic adjustment in response to the accumulation of proline, sucrose, soluble carbohydrates, glycinebetaine, and other solutes in cytoplasm improving water uptake from drying soil. The process of accumulation of such solutes under drought stress is known as osmotic adjustment which strongly depends on the rate of plant water stress.
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