title: Osmotic stress-induced polyamine oxidation mediates defence responses and reduces stress-enhanced grapevine susceptibility to Botrytis cinerea.
abstract: Abiotic factors inducing osmotic stress can influence the plant immune response and resistance to pathogen infections. In this study, the effect of polyethylene glycol (PEG)- and sucrose-induced osmotic stress on polyamine (PA) homeostasis and the basal immune response in grapevine plantlets before and after Botrytis cinerea infection was determined. Pharmacological approaches were also addressed to assess the contribution of osmotic stress-induced PA oxidation to the regulation of defence responses and the susceptibility of grapevine to B. cinerea. Following osmotic stress or pathogen infection, PA homeostasis was linked to enhanced activity of diamine oxidases (CuAO) and PA oxidases (PAO) and the production of 1,3-diaminopropane. These responses paralleled the accumulation of the main stilbenic phytoalexins, resveratrol and ε-viniferin and upregulation of gene transcripts including STS (a stilbene synthase), PR-2 (a β-1,3-glucanase), PR3-4c (acidic chitinase IV), and PR-5 (a thaumatin-like protein), as well as NCED2 involved in abscisic acid biosynthesis. It was also demonstrated that leaves pre-exposed to osmotic stress and later inoculated with B. cinerea showed enhanced PA accumulation and attenuation of CuAO and PAO activities. This was consistent with the impaired production of phytoalexins and transcript levels of defence- and stress-related genes following infection, and the enhanced susceptibility to B. cinerea. Pharmacological experiments revealed that, under osmotic stress conditions, CuAO and PAO were involved in PA homeostasis and in the regulation of defence responses. Specific inhibition of CuAO and PAO in osmotically stressed leaves strongly attenuated the induction of defence responses triggered by B. cinerea infection and enhanced susceptibility to the pathogen. Taken together, this study reveals a contribution of PA catabolism to the resistance state through modulation of immune response in grapevine following osmotic stress and/or after B. cinerea infection.
authors.affiliation: URVVC EA 4707, University of Reims Champagne-Ardenne, UFR Sciences, Bp. 1039, 51687 Reims Cedex 02, France.
authors.forename: Saloua
authors.initials: S
authors.lastname: Hatmi
authors.forename: Patricia
authors.initials: P
authors.lastname: Trotel-Aziz
authors.forename: Sandra
authors.initials: S
authors.lastname: Villaume
authors.forename: Michel
authors.initials: M
authors.lastname: Couderchet
authors.forename: Christophe
authors.initials: C
authors.lastname: Clément
authors.forename: Aziz
authors.initials: A
authors.lastname: Aziz
mesh_terms: D006631:Amine Oxidase (Copper-Containing) / Q000378:metabolism; D020171:Botrytis / Q000472:pathogenicity / Q000502:physiology*; D004198:Disease Susceptibility; D018506:Gene Expression Regulation, Plant; D006706:Homeostasis; D009997:Osmotic Pressure; D010084:Oxidation-Reduction; D000587:Oxidoreductases Acting on CH-NH Group Donors / Q000378:metabolism; D010935:Plant Diseases / Q000276:immunology* / Q000382:microbiology; D057865:Plant Immunity; D018515:Plant Leaves / Q000201:enzymology / Q000276:immunology / Q000382:microbiology / Q000502:physiology; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism; D011073:Polyamines / Q000032:analysis / Q000378:metabolism*; D011092:Polyethylene Glycols / Q000494:pharmacology; D012717:Sesquiterpenes / Q000032:analysis / Q000378:metabolism; D013395:Sucrose / Q000494:pharmacology; D027843:Vitis / Q000201:enzymology / Q000276:immunology* / Q000382:microbiology / Q000502:physiology; D000094162:Phytoalexins; D000097667:Polyamine Oxidase
chemical_list: D006631:Amine Oxidase (Copper-Containing); D000587:Oxidoreductases Acting on CH-NH Group Donors; D010940:Plant Proteins; D011073:Polyamines; D011092:Polyethylene Glycols; D012717:Sesquiterpenes; D013395:Sucrose; D000094162:Phytoalexins; D000097667:Polyamine Oxidase
keywords: Botrytis cinerea; Vitis vinifera.; immune response; osmotic stress; phytoalexins; polyamine oxidation