PJB-2019-437
POTASSIUM INCREASE TOLERANCE TO DROUGHT STRESS IN PLANTS
Amin Ullah Jan
Abstract
Water scarcity is environmental constraint to agricultural production that can reduce crops quantity, quality and yield. The loss in agricultural production due to drought stress perhaps exceeds losses from rest of factors. We re-viewed the effect of water scarcity on plant growth, photosynthesis, nutrients and water relation, stomatal conductance, protein and starch biosynthesis, enzymes activation and compatible osmolytes production. This article also explain the mechanism of drought stress resistance in plants on physiological, morphological and molecular basis. Plant adopt several strategies to handle with drought stress. It reduces stem extension, leaf size, disturbs plant water relations, root proliferation and reduces water use efficiency. Plants exhibited a variety of biochemical and physiological responses at cellular levels under drought stress and making a complex phenomenon. Potassium is an essential macro-nutrient, affect physiological and biochemical processes which alter plant growth. It significantly contributes to plant survival exposed to several abiotic stresses. The current review mainly concentrate on emerging role of potassium in defending against drought stress. The potassium availability and its effects on morphology, anatomy and plant growth are discussed. This review also evaluates the potential of potassium, for improving plant drought stress resistance and climaxes the future needs for research about the role of potassium in agriculture.
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