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Title:   Author  item
                                            Vaughan, Marthaitem
                                            Christensen, Shawnitem
                                            SCHMELZ, ERIC - University Of Californiaitem
                                            HUFFAKER, ALISA - University Of Californiaitem
                                            MCAUSLANE, HEATHER - University Of Floridaitem
                                            Alborn, Hansitem
                                            ALLEN, LEON - Retired ARS Employeeitem
                                            TEAL, PETER - Former ARS Employee
  Submitted to: Meeting Abstract
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 5/19/2016
                                    Publication  Date: 5/19/2016
                                    Citation: Vaughan, M.M., Christensen, S.A., Schmelz, E.A., Huffaker, A., McAuslane, H., Alborn, H.T., Allen, L.H., Teal, P.E. 2016. Maize terpenoid phytoalexins function in resistance against both abiotic and biotic stress [abstract].Interpretive Summary:
                                Technical Abstract: Maize (Zea mays) crop production, which is an essential part of the world’s grain supply, is limited by insect pests, pathogen diseases, and unfavorable weather, such as drought. Zealexins and kauralexins belong to recently identified families of terpenoid phytoalexins that function in maize defense against both insect pests and pathogens. In this study we show that the concentration of zealexin and kauralexin compounds also increase in maize roots exposed to beetle larvae (Diabrotica balteata) root feeding, root infection by the pathogen Fusarium verticillioides, drought stress, or salt stress. Interestingly, the quantity of drought induced phytoalexins is positively correlated with the root-to-shoot ratio of different maize varieties which can be an indication of drought tolerance level. Additionally, we show that an2 mutant plants deficient in kauralexin production are more sensitive to drought. The involvement of terpenoid phytoalexins in drought stress tolerance identifies a greatly desired trait that can be targeted by breeders to combat both abiotic and biotic stress simultaneously.


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