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ARS Home Midwest Area Peoria, Illinois National Center for Agricultural Utilization Research Mycotoxin Prevention and Applied Microbiology Research Research Publications at this Location





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Title:   Author  item
                                            Vaughan, Marthaitem
                                            Huffaker, Alisaitem
                                            Schmelz, Ericitem
                                            Dafoe, Nicoleitem
                                            Christensen, Shawnitem
                                            Sims, Jamesitem
                                            MARTINS, VITOR - University Of Floridaitem
                                            SWERBILOW, JAY - University Of Floridaitem
                                            Romero, Maritzaitem
                                            Alborn, Hansitem
                                            ALLEN, LEON - Retired ARS Employeeitem
                                            Teal, Peter
  Submitted to: Meeting Abstract
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 7/10/2014
                                    Publication  Date: 7/10/2014
                                    Citation: Vaughan, M.M., Huffaker, A., Schmelz, E.A., Dafoe, N.J., Christensen, S.A., Sims, J.W., Martins, V.F., Swerbilow, J., Romero, M.I., Alborn, H.T., Allen, L.H., Teal, P.E. 2014. Effects of elevated [CO2] on maize defense against mycotoxigenic Fusarium verticillioides [abstract].Interpretive Summary:
                                Technical Abstract: Maize is by quantity the most important C4 cereal crop; however, future climate changes are expected to increase maize susceptibility to mycotoxigenic fungal pathogens and reduce productivity. While rising atmospheric [CO2] is a driving force behind the warmer temperatures and drought, which aggravate fungal disease and mycotoxin accumulation, our understanding of how elevated [CO2] will effect maize defenses against such pathogens is limited. Here we report that elevated [CO2] increases maize susceptibility to Fusarium verticillioides proliferation but mycotoxin levels are unaltered. Fumonisin production is not proportional to the increase in F. verticillioides biomass, and the amount of fumonisin produced per unit pathogen is reduced at elevated [CO2]. Following F. verticillioides stalk inoculation, the accumulation of sugars, free fatty acids, lipoxygenase (LOX) transcripts, phytohormones and downstream phytoalexins is dampened in maize grown at elevated [CO2]. The attenuation of maize 13-LOXs and jasmonic acid (JA) production correlates with reduced terpenoid phytoalexins and increased susceptibility. Furthermore, the attenuated induction of 9-LOXs, which have been suggested to stimulate mycotoxin biosynthesis, is consistent with reduced fumonisin per unit fungal biomass at elevated [CO2]. Our findings suggest that elevated [CO2] will compromise maize LOX-dependent signaling which will influence the interactions between maize and mycotoxigenic fungi.


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