Vanillic Acid: A Potential Elicitor of Plant Stress Resilience

Environmental stressors such as extreme temperatures, metal toxicity, UV radiation, salinity, and water shortages affect plant growth, metabolism, and productivity, posing continuous challenges for plants. In response, these stationary organisms have developed a sophisticated and disciplined defense system to survive such stressful conditions. One key strategy involves producing secondary metabolites, which help scavenge stress-induced reactive oxygen species (ROS). Among these secondary metabolites, phenolic compounds like vanillic acid (VA), produced via the phenylpropanoid pathway, are notable. VA has strong antioxidative properties and can influence stress-related signaling and physiological pathways, attracting increasing research interest. This chapter reviews prior research on VA’s role in boosting plant resistance to abiotic stressors. It discusses how VA supports redox balance, maintains cellular homeostasis, regulates stress-responsive pathways, and activates defense genes. Evidence indicates VA’s involvement in enhancing plant defenses and reducing oxidative damage, although our understanding of its in full signaling mechanisms remains limited. Incorporating VA into plant stress management strategies offers a sustainable approach to improving plant resilience amid changing climate conditions. We have compiled and critically examined existing literature on VA to advance plant tolerance through its antioxidant properties. Ultimately, using this class of phenolic compounds to protect plants from adverse growth conditions shows significant promise.