title: Elevated carbon dioxide increases salicylic acid in Glycine max.
abstract: Concentrations of carbon dioxide (CO(2)) are increasing in the atmosphere, affecting soybean (Glycine max L.) phytohormone signaling and herbivore resistance. Whether the impact of elevated CO(2) on phytohormones and induced defenses is a generalized response  within this species is an open question. We examined jasmonic acid (JA) and salicylic acid (SA) under ambient and elevated CO(2) concentrations with and without Japanese beetle (Popillia japonica Newman) damage and artificial damage across six soybean cultivars (HS93-4118,  Pana, IA 3010, Loda, LN97-15076, and Dwight). Elevated CO(2) reduced constitutive levels of JA and related transcripts in some but not all soybean cultivars. In contrast to the variation in JA, constitutive levels of salicylic were increased universally among soybean cultivars grown  under elevated CO(2). Variation in hormonal signaling may underpin observed variation in the response of insect herbivores and pathogens to plants grown under elevated CO(2).
authors: Department of Plant Biology University of Illinois, Urbana-Champaign, IL 61820, USA.
authors: Clare L
authors: CL
authors: Casteel
authors: Lauren M
authors: LM
authors: Segal
authors: Olivia K
authors: OK
authors: Niziolek
authors: May R
authors: MR
authors: Berenbaum
authors: Evan H
authors: EH
authors: DeLucia
mesh_terms: D000818:Animals; D002245:Carbon Dioxide / Q000494:pharmacology*; D057231:Climate Change; D001517:Coleoptera / Q000502:physiology*; D003517:Cyclopentanes / Q000378:metabolism; D018506:Gene Expression Regulation, Plant; D060434:Herbivory; D007700:Kinetics; D054883:Oxylipins / Q000378:metabolism; D020156:Salicylic Acid / Q000378:metabolism*; D015398:Signal Transduction; D013025:Glycine max / Q000187:drug effects* / Q000235:genetics / Q000378:metabolism
chemical_list: D003517:Cyclopentanes; D054883:Oxylipins; D002245:Carbon Dioxide; C011006:jasmonic acid; D020156:Salicylic Acid