Response of Abiotic Stress through Signaling in Plants: A Review

Abstract

This review explores the key components of abiotic stress signaling, including stress perception, secondary messengers like calcium ions and reactive oxygen species (ROS), and the central role of phytohormones such as abscisic acid (ABA). Abiotic stress is the adverse effect of any abiotic factor on a plant in a given environment, affecting its growth and development. Abiotic stresses, such as low or high temperature, deficient or excessive water, high salinity, heavy metals, and ultraviolet radiation, are hostile to plant growth and development, leading to great crop yield penalty worldwide. Abiotic stresses such as drought, salinity, extreme temperatures, and nutrient deficiencies adversely affect plant growth and productivity. Plants have evolved sophisticated signaling mechanisms to perceive, respond, and adapt to these environmental challenges. Plants respond to these stresses through intricate signaling networks that integrate external stimuli and coordinate adaptive responses. Key signaling pathways involve phytohormones like abscisic acid (ABA), salicylic acid (SA), jasmonic acid (JA), and ethylene, which regulate gene expression and physiological processes. Additionally, secondary messengers such as reactive oxygen species (ROS), calcium ions (Ca²⁺), and nitric oxide (NO) play crucial roles in stress perception and signal transduction. Cross-talk between these signaling pathways ensures a robust response, enabling plants to maintain homeostasis, activate stress-specific genes, and promote survival. The dynamic cross-talk between signaling pathways enables plants to integrate multiple stress signals, while transcriptional and post-transcriptional regulation fine-tune stress responses. Emerging insights into epigenetic modifications reveal their role in stress memory, providing an adaptive advantage. These signaling networks offer promising targets for genetic engineering and crop improvement to enhance resilience against abiotic stresses. Understanding the intricacies of these mechanisms is crucial for developing sustainable agricultural practices in the context of climate change.