Asselbergh Bob, De Vleesschauwer David, Höfte Monica
Laboratory of Phytopathology, Ghent University, 9000 Gent, Belgium.
Mol Plant Microbe Interact. 2008 Jun;21(6):709-19. doi: 10.1094/MPMI-21-6-0709.
Plants are obliged to defend themselves against a wide range of biotic and abiotic stresses. Complex regulatory signaling networks mount an appropriate defense response depending on the type of stress that is perceived. In response to abiotic stresses such as drought, cold, and salinity, the function of abscisic acid (ABA) is well documented: elevation of plant ABA levels and activation of ABA-responsive signaling result in regulation of stomatal aperture and expression of stress-responsive genes. In response to pathogens, the role of ABA is more obscure and is a research topic that has long been overlooked. This article aims to evaluate and review the reported modes of ABA action on pathogen defense and highlight recent advances in deciphering the complex role of ABA in plant-pathogen interactions. The proposed mechanisms responsible for positive or negative effects of ABA on pathogen defense are discussed, as well as the regulation of ABA signaling and in planta ABA concentrations by beneficial and pathogenic microorganisms. In addition, the fast-growing number of reports that characterize antagonistic and synergistic interactions between abiotic and biotic stress responses point to ABA as an essential component in integrating and fine-tuning abiotic and biotic stress-response signaling networks.
植物必须抵御各种各样的生物和非生物胁迫。复杂的调控信号网络会根据所感知到的胁迫类型产生适当的防御反应。对于干旱、寒冷和盐度等非生物胁迫，脱落酸（ABA）的作用已有充分记载：植物ABA水平的升高和ABA响应信号的激活会导致气孔孔径的调节以及胁迫响应基因的表达。对于病原体，ABA的作用则更为模糊，长期以来一直是一个被忽视的研究课题。本文旨在评估和综述已报道的ABA在病原体防御中的作用模式，并突出在解读ABA在植物-病原体相互作用中的复杂作用方面的最新进展。文中讨论了ABA对病原体防御产生正负效应的潜在机制，以及有益微生物和致病微生物对ABA信号传导和植物体内ABA浓度的调控。此外，越来越多的报告表明非生物胁迫和生物胁迫反应之间存在拮抗和协同相互作用，这表明ABA是整合和微调非生物胁迫和生物胁迫反应信号网络的重要组成部分。
