Journal Article

Elevated Carbon Dioxide Increases Salicylic Acid in Glycine max

Clare L. Casteel, Lauren M. Segal, Olivia K. Niziolek, May R. Berenbaum and Evan H. DeLucia

in Environmental Entomology

Published on behalf of Entomological Society of America

Volume 41, issue 6, pages 1435-1442
Published in print December 2012 | ISSN: 0046-225X
Published online November 2014 | e-ISSN: 1938-2936 | DOI:
Elevated Carbon Dioxide Increases Salicylic Acid in Glycine max

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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 (Popillia japonica 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.

Keywords: global change; jasmonic acid; plant-insect interactions; salicylic acid

Journal Article.  5506 words.  Illustrated.

Subjects: Entomology

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