PJB-2018-169
Agronomic, Physiological and Biochemical Approaches For Enhancing the Drought and Heat Tolerance of Cotton: An Overview
Ayman EL Sabagh
Abstract
Drought and heat stresses adversely affect the seed yield and fiber quality of cotton worldwide. However, the alarming global climate change has augmented that the situation might be more worse in the near future. Thus, development of high yielding cotton genotypes having tolerance to drought and heat stresses is one of the utmost aims and dire need of the cotton breeders all over the world. Therefore, it is important to study the tolerance in cotton genotypes under heat and drought stress conditions to understand the physiological, biochemical responses to stresses as well as agronomical performance of the genotypes under stress conditions. The correlation study between yield and physiological as well as biochemical (non-enzymatic antioxidants and enzymatic antioxidants) response is also most important to develop the efficient genotypes under heat and drought stress conditions. Screening of cotton genotypes under heat and drought stress conditions is one of the important protocols that can be used to select large number of population within the shortest period of time. This approach can be used to differentiate the agronomical, physiological and biochemical attributes of cotton genotypes contrasting for drought and heat stress tolerance.These approaches provides better understanding of biochemical (antioxidant enzyme activities) and physiological mechanisms of tolerance to stress conditions and consequently will contribute to understand the agronomic performances and genetic basis of tolerance of potential cotton. This review also summarized the current understandings of exogenous some organic protectants like application of proline, glycine betaine and soil amendments that could be used to decrease the harmful impacts of drought and heat stress for improving the sustainable yield and quality of cotton.
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