Effect of Treating Apple Trees with Acibenzolar-S-Methyl on Fire Blight and Expression of Pathogenesis-Related Protein Genes

Plant Disease
Kimberly Maxson-SteinAlan L Jones

Abstract

Acibenzolar-S-methyl (ASM, Actigard 50 WG), a synthetic inducer of systemic acquired resistance (SAR) and pathogenesis-related (PR) proteins, was evaluated for the control of fire blight on apple trees in the field and for PR protein gene expression in apple seedlings in the greenhouse. Expression of putative genes related to SAR induction was elevated in ASM-treated apple seedlings 2 to 7 days after treatment; levels of PR-1 and PR-8 RNA were increased 10-fold and PR-2 RNA was increased 100-fold in ASM-treated seedlings over levels in untreated seedlings. Spurs and shoots on Jonathan trees sprayed with ASM at 75 mg a.i./liter at pink and at weekly intervals thereafter had significantly less fire blight than untreated trees, both from natural infection and following artificial inoculation with the pathogen. Less fire blight was observed on trees sprayed weekly with ASM than on trees sprayed biweekly. The severity of fire blight on inoculated shoots of Fuji apple decreased with increasing rates of ASM (0 to 300 mg a.i./liter), and ASM combined with streptomycin showed enhanced activity over ASM at 75 mg a.i./liter alone. In general, ASM was not superior to streptomycin for fire blight control, but integrating a weekly schedule o...Continue Reading

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Citations

Dec 20, 2017·Frontiers in Plant Science·Brice MarolleauMarie-Noëlle Brisset
Jan 9, 2019·Frontiers in Plant Science·Romain WarneysAlexandre Degrave
Mar 28, 2007·Annual Review of Phytopathology·J B JonesM T Momol
Mar 28, 2013·Bacteriophage·Jeffrey B JonesM Timur Momol
Jul 27, 2017·Frontiers in Plant Science·David JespersenBingru Huang
Jul 31, 2002·Annual Review of Phytopathology·Patricia S McManusAlan L Jones
Sep 9, 2010·Phytopathology·A L Mila, H K Ngugi
Oct 13, 2016·Physiology and Molecular Biology of Plants : an International Journal of Functional Plant Biology·Nilanjan ChakrabortyKrishnendu Acharya
Sep 4, 2010·Plant Physiology·Dharmendra K SinghTimothy W McNellis
Nov 6, 2014·Journal of Agricultural and Food Chemistry·Thomas Dugé de BernonvilleMarie-Noëlle Brisset

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