Getting to PTI of bacterial RNAs: Triggering plant innate immunity by extracellular RNAs from bacteria. (2nd July 2016)

• Record Type: Journal Article
• Authors: Park, Yong-Soon; Lee, Boyoung; Ryu, Choong-Min
• Is Part Of: Plant signaling & behavior. Volume 11:Number 7(2016)
• Publication Date: 2016-07-02
• Subjects: Arabidopsis -- bacterial RNAs -- plant innate immunity -- Pseudomonas syringae pv. tomato DC3000 -- PTI; Plant ecophysiology -- Periodicals; Plant cellular signal transduction -- Periodicals; Plant cellular signal transduction; Plant ecophysiology; Periodicals; Electronic journals; 581
• DOI: 10.1080/15592324.2016.1198866
• Languages: English
• ISSNs: 1559-2316

Abstract

ABSTRACT: Defense against diverse biotic and abiotic stresses requires the plant to distinguish between self and non-self signaling molecules. Pathogen/microbe-associated molecular patterns (PAMPs/MAMPs) are pivotal for triggering innate immunity in plants. Unlike in animals and humans, the precise roles of nucleic acids in plant innate immunity are unclear. We therefore investigated the effects of infiltration of total Pseudomonas syringae pv. tomato DC3000 ( Pto DC3000) RNAs into Arabidopsis plants. The pathogen population was 10-fold lower in bacterial RNAs pre-treated Arabidopsis plants than in the control. Bacterial RNAs purity was confirmed by physical (sonication) and chemical (RNase A and proteinase K digestion) methods. The perception of bacterial RNAs, especially rRNAs, positively regulated mitogen-activated protein kinase (MAPK) and induced a reactive oxygen species burst, callose deposition, salicylic acid (SA) and jasmonic acid (JA) signaling, and defense-related genes. Therefore, bacterial RNAs function as a new MAMP that activates plant innate immunity, providing a new paradigm for plant–microbe interactions.