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1 December 2012 Elevated Carbon Dioxide Increases Salicylic Acid in Glycine max
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Abstract
Concentrations of carbon dioxide (CO2) are increasing in the atmosphere, affecting soybean (Glycine max L.) phytohormone signaling and herbivore resistance. Whether the impact of elevated CO2 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 CO2 concentrations with and without Japanese beetle (Popilliajaponica Newman) damage and artificial damage across six soybean cultivars (HS93–4118, Pana, IA 3010, Loda, LN97–15076, and Dwight). Elevated CO2 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 CO2. Variation in hormonal signaling may underpin observed variation in the response of insect herbivores and pathogens to plants grown under elevated CO2.
© 2012 Entomological Society of America
Clare L. Casteel, Lauren M. Segal, Olivia K. Niziolek, May R. Berenbaum and Evan H. Delucia "Elevated Carbon Dioxide Increases Salicylic Acid in Glycine max," Environmental Entomology 41(6), (1 December 2012). https://doi.org/10.1603/EN12196
Received: 6 July 2012; Accepted: 1 October 2012; Published: 1 December 2012
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