CITAAC   25595
CENTRO DE INVESTIGACIONES EN TOXICOLOGIA AMBIENTAL Y AGROBIOTECNOLOGIA DEL COMAHUE
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Potential use of resistance inducer substances to control Botrytis cinerea on pears in North-Patagonia, Argentina
Autor/es:
VERA, L.; SOSA, M.C.; CARMONA, M.; LUTZ, M.C.; BRICEÑO, Y.
Lugar:
Santa Cruz
Reunión:
Simposio; XVII INTERNATIONAL BOTRYTIS SYMPOSIUM; 2016
Institución organizadora:
Universidad de Chile
Resumen:
B.cinerea havebeen reported as the main postharvest pathogens in D´Anjou pears in Alto Valleof Río Negro and Neuquén. Actually, there are regional and global demands ofeffective and environmentally friendly control strategies. The objectives ofthis study were to evaluate the effect of three resistance inductors (IsR): 2potassium phosphite (KPhi) (A: 40% v/v & B: 39.2% v/v), manganese phosphite(MnPhi) (40% v/v), and acibenzolar-S-methyl (ASM) (50% w/w) on in vitro B. cinerea mycelial growth inhibition and, in vivo, on D?Anjou pear fruits. Different concentrations of eachactive ingredient were evaluated in vitroagainst B. cinerea mycelium growth onPDA-medium. The effect in vivo ofeach IsR was assessed at commercial dose applied to fruits by immersion for 1min. Fruits were divided in 3 sets: 1) wounded previous treatment, 2) woundedpost treatment, and 3) without wounds. Treated fruits with IsR were incubated72h at 20°C and inoculated with 10 μL of 104 conidia·mL-1 ofpathogen. Fruits were stored 60d in commercial chamber (-1/0°C-95%HR). Theincidence (%) and severity (mm) of the pathogen on fruit wounds were evaluated.Natural incidence of postharvest diseases was determined at 90d of storage.Mycelial growth of B. cinerea was100% inhibited with 400 mg·L-1 of KPhi A and 800 mg·L-1ofMnPhi; while KPhi B and ASM at 1000 mg·L-1 inhibited in 65% of itsgrowth. Effect of IsR treatments applied on wounded fruit (previous treatment),showed significative reduction on the disease incidence using ASM (16%) andKPhi B (20.3%) in relation to the control treatment. The disease severity wasreduced in 39.6% and the incidence of decay on the wounded fruit aftertreatment with IsR was from 65% to 96.6%. TheASM inducer showed a significant difference respect to the control. MnPhiincreased the disease severity by 7.75%. The natural incidence of B. cinerea was controlled by all IsR at90d of storage. Although, it need furthers studies, this results show that the higherinducer resistance effect would develop on wounded fruit. KPhi B and ASM couldinduce resistance against pathogens in DÁnjou pears, whereas KPhi A and MnPhihad a direct effect on Botrytis cinerea.