Abstract
An ever-expanding world population and globally changing diet preferences have put considerable pressure on the worldwide agricultural community to produce more food, feed, and bioenergy crops. As a result, marginal land areas will need to be used to meet the increasing requirement of future generations, especially in developing countries. These marginal areas commonly impose various types of stresses on crops due to factors such as salinity, soil water deficit, temperature extremes, flooding, low nutrients, and aluminum or heavy metal toxicity. As a consequence, the growth and yield of crops from such areas is typically low and their quality is poor, limiting farmer income. Endogenous plant growth regulators play an important role in regulating plant responses to above-mentioned stresses by sensitizing growth and developmental processes. While the physiological and molecular mechanisms linked to the role of abscisic acid and cytokinins in stress tolerance are well explained, there is growing interest to elucidate the associations of auxins, ethylene, gibberellins, brassinosteroids, and polyamines in water deficit tolerance mechanism and also on possible cross-talk mechanism among different growth regulators during tolerance acquisition. Identification and characterization of the gene regulating synthesis of different endogenous growth regulators and recent progresses on hormonal signaling, mutant research, and physiological actions have provided scope for manipulating their biosynthetic pathways for developing transgenic crop plants with enhanced abiotic stress tolerance. Researches have also provided some leads in exploiting the potential of growth regulators in enhancing the resistance to abiotic stresses of crops. Plant growth regulators are chemical compounds that stimulate plant growth and productivity when applied, even in small quantities at appropriate plant growth stages. These are being extensively used in agriculture to enhance the productivity in agricultural crops. Their central role in plant growth and development is through nutrient allocation and source–sink transitions while most of the plant bio-regulators stimulate redox signaling under abiotic stress conditions.
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Bhattacharya, A. (2021). Role of Plant Growth Hormones During Soil Water Deficit: A Review. In: Soil Water Deficit and Physiological Issues in Plants. Springer, Singapore. https://doi.org/10.1007/978-981-33-6276-5_6
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