INVESTIGADORES
GARRIZ Andres
congresos y reuniones científicas
Título:
MECANISMOS DE PROTECCIÓN CONTRA PATÓGENOS FÚNGICOS PRODUCTORES DE OXALATO MEDIADOS POR CEPAS OXALOTRÓFICAS DE Stenotrophomonas spp EN PLANTAS.
Autor/es:
FERNANDO M. ROMERO; VILLARREAL NATALIA; ANDRÉS GÁRRIZ; GUSTAVO MARTINEZ; FERNANDO L. PIECKENSTAIN; MARÍA MARINA
Lugar:
Corrientes
Reunión:
Congreso; XXXI Reunion Argentina de Fisiología Vegetal 2016; 2016
Institución organizadora:
SAFV
Resumen:
Oxalic acid plays a key role as a virulence factorfor the necrotrophic fungi Botrytis cinerea andSclerotinia sclerotiorum. Two oxalotrophic strains(OxA and OxB) of the bacterial genusStenotrophomonas were isolated from therhizosphere of tomato plants. These strains wereable to endophytically colonize Arabidopsisleaves and protected them from damage causedby oxalate application. OxA and OxB did notinduce defence-gene expression in Arabidopsis(PR1 and PDF1.2) and tomato (PR1 and pinII).Both strains induced callose deposition andaccumulation of phenolic compounds. Moreover,OxB down-regulated the expression of plantgenes involved in cell wall metabolism,suggesting that cell wall degradation isattenuated in leaves colonized by this strain. Inaddition, OxA and OxB protected Arabidopsisleaves from S. sclerotiorum and B. cinereainfection, although none of these bacteriainhibited growth of the above-mentionedpathogens in vitro. Moreover, in sid2-2 and coi1Arabidopsis mutants respectively affected insignalling pathways mediated by salicylic acidand jasmonates, both isolates exerted aprotective effect against fungal pathogens in asimilar way to wild type plants. Results herebypresented suggest that these oxalotrophicbacteria protect plants against oxalate-producingpathogens by degrading oxalic acid andstrengthening plant cell walls.