Phenolics as Shielding Counterparts from Plants to Combat Biotic Stress Mediated by Microbes and Nematodes

The secondary metabolites known as polyphenols, sometimes known as plant phenolics, have a variety of roles in reducing the effects of abiotic (such as temperatures, cold, drought salt, or heavy metals) and biotic (such as bacteria, virus, fungi, insect, or weed) stresses. Phenolic chemicals produced by the typical phenylpropanoid pathway function as signaling molecules and may be used as plant scavengers. Phenolic substances involve in immune responses to infections caused by viruses or bacteria, excessive sun or light exposure, wounds, and stresses involving heavy metals. They are imperative for controlling seed germination as well as working together to control plant growth. One important function of phenolic substances obtained from plant is as protective chemicals against disease-causing organisms such fungi, bacteria, nematodes, weeds, and some other pathogens. The signaling cascade serves as a conduit for the production of the proper physiological or biochemical response to biotic stress.