Many unfavorable stress conditions, such as wounding, drought, extreme temperatures, salinity and pathogen attacks, control growth, development and plant yield. To survive in such environments, plants have developed many strategies. They are able to induce the expression of a large number of genes that encode effectors, receptors, as well as signaling proteins and protective molecules. Among all, pathogenesis-related proteins (PRs) were found to be activated in response to different biotic and abiotic threats. Those proteins have a wide range of functions; acting as chitinases, peroxidases, anti-microbial agents, hydrolases, protease inhibitors, and other activities. Activation of PR proteins has been demonstrated in different plant families as a response to different stresses. In this review, we have summarized the structural, biological and functional characteristics of the different PRs families in plants, their regulation, as well as their roles in plant defense against abiotic and biotic stresses.

许多不利的胁迫条件，例如伤害、干旱、极端温度、盐度和病原体侵袭，控制着植物的生长、发育和产量。为了在这样的环境中生存，植物制定了许多策略。它们能够诱导大量编码效应器、受体以及信号蛋白和保护分子的基因表达。其中，发病机制相关蛋白 (PRs) 被发现响应不同的生物和非生物威胁而被激活。这些蛋白质具有广泛的功能。作为几丁质酶、过氧化物酶、抗微生物剂、水解酶、蛋白酶抑制剂和其他活性。PR 蛋白的激活已在不同的植物家族中被证明是对不同胁迫的反应。在这篇评论中，我们总结了结构，