Crosstalk Among Phytohormone Signaling Pathways During Abiotic Stress

In plants, the complex but specific crosstalk networks among phytohormones enable them to grow as well as survive under any kind of stress environment. There are some overlapping responses of different phytohormones which make plants tolerant to multiple stresses. Moreover, the phytohormone crosstalk also alters and regulates the expression of stress-responsive genes. This chapter sums up the crosstalk between important phytohormones such as abscisic acid (ABA), gibberellic acid, ethylene, auxins, and cytokinins under an abiotic stress environment that strengthens defenses. ABA will be taken as the central phytohormone for better understanding. The chapter also analyzes physiological changes and the gene expression regulated by crosstalk between different phytohormones under abiotic stress conditions, specifically drought, cold, and salinity stresses. It further improves readers' understanding of phytohormonal crosstalk during abiotic stress conditions, which will subsequently further widen their knowledge for crop improvement.