Guanosine tetraphosphate modulates salicylic acid signalling and the resistance of $Arabidopsis\ thaliana$ to Turnip mosaic virus
2017
Abdelkefi, Hela | Sugliani, Matteo | Ke, Hang | Harchouni, Seddik | Soubigou-Taconnat, Ludivine | Citerne, Sylvie | Mouille, Gregory | Fakhfakh, Hatem | Robaglia, Christophe, C. | Field, Ben | Luminy Génétique et Biophysique des Plantes (LGBP) ; Institut de Biosciences et Biotechnologies d'Aix-Marseille (ex-IBEB) (BIAM) ; Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) | Faculty of Sciences of Tunis (University of Tunis) ; Tunis El Manar University [University of Tunis El Manar] [Tunisia] = Université de Tunis El Manar [Tunisie] = جامعة تونس المنار (ar) (UTM) | Institut des Sciences des Plantes de Paris-Saclay (IPS2 (UMR_9213 / UMR_1403)) ; Institut National de la Recherche Agronomique (INRA)-Université Paris-Sud - Paris 11 (UP11)-Université Paris Diderot - Paris 7 (UPD7)-Université d'Évry-Val-d'Essonne (UEVE)-Centre National de la Recherche Scientifique (CNRS) | Institut Jean-Pierre Bourgin (IJPB) ; Institut National de la Recherche Agronomique (INRA)-AgroParisTech | Agence Nationale de la Recherche [ANR-10-JCJC-120, ANR-10-LABX-0040-SPS] ; Tunisian Ministry of Higher Education ; China Scholarship Council ; CEA PhD studentship | ANR-10-JCJC-1201,CHLORO_SAP,Acclimatation à l'environnement dirigé par le chloroplaste dans les plantes.(2010) | ANR-11-IDEX-0002,UNITI,Université Fédérale de Toulouse(2011)
International audience
显示更多 [+] 显示较少 [-]英语. Chloroplasts can act as key players in the perception and acclimatization of plants to incoming environmental signals. A growing body of evidence indicates that chloroplasts play a critical role in plant immunity. Chloroplast function can be regulated by the nucleotides guanosine tetraphosphate and pentaphosphate [(p)ppGpp]. In plants, (p)ppGpp levels increase in response to abiotic stress and to plant hormones which are involved in abiotic and biotic stress signalling. In this study, we analysed the transcriptome of Arabidopsis plants that over‐accumulate (p)ppGpp, and unexpectedly found a decrease in the levels of a broad range of transcripts for plant defence and immunity. To determine whether (p)ppGpp is involved in the modulation of plant immunity, we analysed the susceptibility of plants with different levels of (p)ppGpp to Turnip mosaic virus (TuMV) carrying a green fluorescent protein (GFP) reporter. We found that (p)ppGpp accumulation was associated with increased susceptibility to TuMV and reduced levels of the defence hormone salicylic acid (SA). In contrast, plants with lower (p)ppGpp levels showed reduced susceptibility to TuMV, and this was associated with the precocious up‐regulation of defence‐related genes and increased SA content. We have therefore demonstrated a new link between (p)ppGpp metabolism and plant immunity in Arabidopsis.
显示更多 [+] 显示较少 [-]