Role Of Pathogenesis-Related (PR) Proteins in Plant Microbes Defence Mechanism

Abstract

A group of diverse substances called PR proteins and antimicrobial peptides (AMPs) are produced by phytopathogens and signalling molecules connected to defence. They are crucial elements of the plant's innate immune system, particularly in the case of molecular markers for defensive signalling pathways called systemic acquired resistance (SAR). Although PR proteins and peptides were discovered prior to the development of modern scientific tools, little is known about their biological significance. One of the most promising methods for creating disease-resistant transgenic crops uses plant genetic engineering, which makes use of several antimicrobial genes like PR genes. Overexpression of the PR genes (chitinase, glucanase, thaumatin, defensin, and thionin) singly or in combination has a major impact on the level of plant defence against many diseases. However, enhancing agricultural plants' resistance to a variety of stresses requires a detailed understanding of the signalling pathways that regulate the expression of these adaptive proteins. This is the topic of plant stress biology, which will be covered in the future. Since PR proteins are involved in both biotic and abiotic stress, as well as plant defence signalling pathways, this analysis gives a thorough review of PR proteins. Additionally, we talked about the advantages and disadvantages of transgenic plants, PR proteins, and peptide expression.