Phospholipase D Activation Is an Early Component of the Salicylic Acid Signaling Pathway in Arabidopsis Cell Suspensions

被引:65
作者
Krinke, Ondrej [1 ,2 ]
Flemr, Matyas [1 ,2 ]
Vergnolle, Chantal [1 ]
Collin, Sylvie [1 ]
Renou, Jean-Pierre [3 ]
Taconnat, Ludivine [3 ]
Yu, Agnes [3 ]
Burketova, Lenka [4 ]
Valentova, Olga [2 ]
Zachowski, Alain [1 ]
Ruelland, Eric [1 ]
机构
[1] Univ Paris 06, UPMC, CNRS,Lab Physiol Cellulaire & Mol Plantes, Unite Rech 5,Equipe Accueil Conventionnee 7180, F-94200 Ivry, France
[2] Inst Chem Technol, Dept Biochem & Microbiol, CR-16628 Prague, Czech Republic
[3] CNRS 8114, INRA 1165, UMR, Unite Rech Genom Vegetale, F-91057 Evry, France
[4] Acad Sci Czech Republic, Inst Expt Bot, Prague 16000, Czech Republic
关键词
SYSTEMIC ACQUIRED-RESISTANCE; TRANSCRIPTION FACTOR; INNATE IMMUNITY; EARLY RESPONSE; PLANT DEFENSE; STRESS; EXPRESSION; IMPLICATE; PROTEINS; DATABASE;
D O I
10.1104/pp.108.133595
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Salicylic acid (SA) plays a central role in defense against pathogen attack, as well as in germination, flowering, senescence, and the acquisition of thermotolerance. In this report we investigate the involvement of phospholipase D (PLD) in the SA signaling pathway. In presence of exogenous primary alcohols, the production of phosphatidic acid by PLD is diverted toward the formation of phosphatidylalcohols through a reaction called transphosphatidylation. By in vivo metabolic phospholipid labeling with P-33(i), PLD activity was found to be induced 45 min after addition of SA. We show that incubation of Arabidopsis (Arabidopsis thaliana) cell suspensions with primary alcohols inhibited the induction of two SA-responsive genes, PATHOGENESIS-RELATED1 and WRKY38, in a dose-dependent manner. This inhibitory effect was more pronounced when the primary alcohols were more hydrophobic. Secondary or tertiary alcohols had no inhibitory effect. These results provide compelling arguments for PLD activity being upstream of the induction of these genes by SA. A subsequent study of n-butanol effects on the SA-responsive transcriptome identified 1,327 genes differentially expressed upon SA treatment. Strikingly, the SA response of 380 of these genes was inhibited by n-butanol but not by tert-butanol. A detailed analysis of the regulation of these genes showed that PLD could act both positively and negatively, either on gene induction or gene repression. The overlap with the previously described phosphatidylinositol-4-kinase pathway is discussed.
引用
收藏
页码:424 / 436
页数:13
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