الفهرس 
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Abstract
I. Introduction
A worldwide temperature alteration, water shortage, and expanded salinization of the two soils, and water one of the feature occasions for the start of the 21st century. Abiotic stress is already a major limiting factor in plant growth and will soon become even more sever as desertification covers more and more of the world’s terrestrial area (Vinocur and Altman, 2005). Abiotic stress not only limits crop productivity, but also influence in distribution of plant species in different types of environments. Plants are exposed to various kinds of abiotic stresses in their natural environment including nutrient deficiency, salinity, chilling, freezing, and drought. Every aspect of plant growth and metabolism is affected by abiotic stress. Plant response to abiotic stress rely on enormous number of components like length and level of pressure, phase of development and time of presentation of stress (Gupta and Sheoran, 1983), Plant adjust various procedures because of various abiotic stresses, for example, parchedness, high salt, cold and warmth, which eventually influence the plant development and profitability (Gill et al., 2003). In the field, a plant may experience several distinct abiotic stresses either concurrently or at different times throughout the growing season (Tester and Bacic, 2005).
Potato is the fourth most significant yield of the world with yearly creation moving toward 300 million tons. The tuber, the most significant piece of the plant, is a magnificent wellspring of complex starches, proteins, and nutrients (Banerjee et al., 2006). Potato tubers give similarly better return per section of land, commonly than that of any grain crop (Burton, 1969), and are used in a wide variety of table potato, processed, livestock feed, and industrial uses (Feuste