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Elevated CO2 Increases Constitutive Phenolics and Trichomes, but Decreases Inducibility of Phenolics in Brassica rapa (Brassicaceae)

Elevated CO2 Increases Constitutive Phenolics and Trichomes, but Decreases Inducibility of... Increasing global atmospheric CO2 has been shown to affect important plant traits, including constitutive levels of defensive compounds. However, little is known about the effects of elevated CO2 on the inducibility of chemical defenses or on plant mechanical defenses. We grew Brassica rapa (oilseed rape) under ambient and elevated CO2 to determine the effects of elevated CO2 on constitutive levels and inducibility of carbon-based phenolic compounds, and on constitutive trichome densities. Trichome density increased by 57% under elevated CO2. Constitutive levels of simple, complex, and total phenolics also increased under elevated CO2, but inducibility of each decreased. Induction of simple phenolics occurred only under ambient CO2. Although induction of complex and total phenolics occurred under both ambient and elevated CO2, the damage-induced increases were 64% and 75% smaller, respectively, under elevated CO2. Constitutive phenolic levels were positively correlated with leaf C:N ratio, and inducibility was positively correlated with leaf N and negatively correlated with leaf C:N ratio, as would be expected if inducibility were constrained by nitrogen availability under elevated CO2. We conclude that B. rapa is likely to exhibit higher constitutive levels of both chemical and mechanical defenses in the future, but is also likely to be less able to respond to herbivore damage by inducing phenolic defenses. To our knowledge, this is only the second study to report a negative effect of elevated CO2 on the inducibility of any plant defense. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Chemical Ecology Springer Journals

Elevated CO2 Increases Constitutive Phenolics and Trichomes, but Decreases Inducibility of Phenolics in Brassica rapa (Brassicaceae)

Journal of Chemical Ecology , Volume 37 (12) – Dec 15, 2011

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References (51)

Publisher
Springer Journals
Copyright
Copyright © 2011 by Springer Science+Business Media, LLC
Subject
Life Sciences; Agriculture; Entomology; Biochemistry, general; Biological Microscopy; Ecology
ISSN
0098-0331
eISSN
1573-1561
DOI
10.1007/s10886-011-0044-z
pmid
22170345
Publisher site
See Article on Publisher Site

Abstract

Increasing global atmospheric CO2 has been shown to affect important plant traits, including constitutive levels of defensive compounds. However, little is known about the effects of elevated CO2 on the inducibility of chemical defenses or on plant mechanical defenses. We grew Brassica rapa (oilseed rape) under ambient and elevated CO2 to determine the effects of elevated CO2 on constitutive levels and inducibility of carbon-based phenolic compounds, and on constitutive trichome densities. Trichome density increased by 57% under elevated CO2. Constitutive levels of simple, complex, and total phenolics also increased under elevated CO2, but inducibility of each decreased. Induction of simple phenolics occurred only under ambient CO2. Although induction of complex and total phenolics occurred under both ambient and elevated CO2, the damage-induced increases were 64% and 75% smaller, respectively, under elevated CO2. Constitutive phenolic levels were positively correlated with leaf C:N ratio, and inducibility was positively correlated with leaf N and negatively correlated with leaf C:N ratio, as would be expected if inducibility were constrained by nitrogen availability under elevated CO2. We conclude that B. rapa is likely to exhibit higher constitutive levels of both chemical and mechanical defenses in the future, but is also likely to be less able to respond to herbivore damage by inducing phenolic defenses. To our knowledge, this is only the second study to report a negative effect of elevated CO2 on the inducibility of any plant defense.

Journal

Journal of Chemical EcologySpringer Journals

Published: Dec 15, 2011

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