Pseudomonas syringae can rapidly deploy specialized functions to deal with abiotic and biotic stresses. Host niches pose specific sets of environmental challenges driven, in part, by immune defenses. Bacteria use a “just-in-time” strategy of gene regulation, meaning that they only produce the functions necessary for survival as needed. Extracytoplasmic function (ECF) sigma factors transduce a specific set of environmental signals and change gene expression patterns by altering RNA polymerase promoter specificity, to adjust bacterial physiology, structure, or behavior, singly or in combination, to improve chances of survival. The broadly conserved ECF sigma factor AlgU affects virulence in both animal and plant pathogens. Pseudomonas syringae AlgU controls expression of more than 800 genes, some of which contribute to suppression of plant immunity and bacterial fitness in plants. This review discusses AlgU activation mechanisms, functions controlled by AlgU, and how these functions contribute to P. syringae survival in plants.

The author(s) have dedicated the work to the public domain under the Creative Commons CC0 “No Rights Reserved” license by waiving all of his or her rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. 2021

丁香假单胞菌可以快速部署专门的功能来应对非生物和生物胁迫。主机壁ni构成了一系列特定的环境挑战，部分是由免疫防御驱动的。细菌使用基因调节的“及时”策略，这意味着它们仅产生所需的生存所必需的功能。细胞质外功能（ECF）σ因子通过改变RNA聚合酶启动子的特异性来转导一组特定的环境信号并改变基因表达模式，以单独或组合方式调节细菌的生理，结构或行为，以提高生存机会。广泛保存的ECFσ因子AlgU影响动植物病原体中的毒力。丁香假单胞菌AlgU控制着800多个基因的表达，其中一些有助于抑制植物的免疫力和植物的细菌适应性。这篇综述讨论了AlgU激活机制，由AlgU控制的功能，以及这些功能如何促进丁香假单胞菌在植物中的存活。

作者根据知识共享CC0“无保留权利”许可，将作品专用于公共领域，在一定程度上放弃了著作权法规定的他对世界范围内作品的所有权利，包括所有相关和邻近权利法律允许。2021年