Guanosine tetraphosphate modulates salicylic acid signalling and the resistance of Arabidopsis thaliana to Turnip mosaic virus

• DOI: 10.1111/mpp.12548
• Publication Date: 2017-02-21T16:35:54Z
• Authors: Hela Abdelkefi; Matteo Sugliani; Hang Ke; Seddik Harchouni; Ludivine Soubigou...; Sylvie Citerne; Gregory Mouille; Hatem Fakhfakh; Christophe Robaglia; Ben Field
• Keywords: Plant Immunity; Biotic stress; Plant hormone

Chloroplasts can act as key players in the perception and acclimatization of plants to incoming environmental signals. A growing body evidence indicates that chloroplasts play a critical role plant immunity. Chloroplast function be regulated by nucleotides guanosine tetraphosphate pentaphosphate [(p)ppGpp]. In plants, (p)ppGpp levels increase response abiotic stress hormones which are involved biotic signalling. this study, we analysed transcriptome Arabidopsis over-accumulate (p)ppGpp, unexpectedly found decrease broad range transcripts for defence To determine whether is modulation immunity, susceptibility with different Turnip mosaic virus (TuMV) carrying green fluorescent protein (GFP) reporter. We accumulation was associated increased TuMV reduced hormone salicylic acid (SA). contrast, lower showed TuMV, precocious up-regulation defence-related genes SA content. have therefore demonstrated new link between metabolism immunity Arabidopsis.