Submitted to: American Phytopathological Society Annual Meeting
Publication Type: Abstract Only
Publication Acceptance Date: 8/3/2005
Publication Date: 6/24/2005
Citation: Zhang, S., Schisler, D.A., Boehm, M.J. 2005. Evaluation of chemical SAR inducers in combination with Cryptococcus nodaensis OH 182.9 for FHB control in wheat [abstract]. American Phytopathological Society Annual Meeting. Phytopathology 95:S117.
Technical Abstract: The potential of chemical inducers of systemic acquired resistance (SAR) to reduce Fusarium head blight (FHB) alone or in combination with biological control was assessed in greenhouse trials. When applied to wheat heads at 3 days before pathogen inoculation with Gibberella zeae, sodium salicylate (NaSA) and isonicotinic acid (INA) at 10 mM significantly reduced FHB severity compared to the nontreated control. NaSA and INA at concentrations of 1 and 5 mM had an additive effect with the yeast antagonist C. nodaensis OH 182.9 on FHB reduction but DL-beta-amino-n-butyric acid (BABA) did not. When sprayed onto the leaf sheath surrounding heads at 10 days prior to pathogen inoculation, NaSA, INA and BABA at 1 mM reduced FHB severity indicating that induced systemic resistance was, at least in part, responsible for FHB disease suppression. Induced FHB resistance was achieved by treating wheat with INA at concentrations as low as 0.1 mM. Data from this study suggest that chemical SAR inducers can induce resistance in wheat against FHB, and improved control of FHB disease can be achieved by incorporating chemical inducers of SAR with the FHB biocontrol agent OH 182.9 under greenhouse conditions.