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  Herbivore-induced volatile emission from old-growth black poplar trees under field conditions

Clavijo McCormick, A. L., Irmisch, S., Boeckler, A., Gershenzon, J., Köllner, T. G., & Unsicker, S. (2019). Herbivore-induced volatile emission from old-growth black poplar trees under field conditions. Scientific Reports, 9: 7714. doi:10.1038/s41598-019-43931-y.

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http://dx.doi.org/10.1038/s41598-019-43931-y (Publisher version)
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 Creators:
Clavijo McCormick, Andrea Liliana1, 2, Author              
Irmisch, Sandra1, 2, Author              
Boeckler, Andreas1, 2, Author              
Gershenzon, Jonathan1, Author              
Köllner, Tobias G.1, Author              
Unsicker, Sybille1, Author              
Affiliations:
1Department of Biochemistry, Prof. J. Gershenzon, MPI for Chemical Ecology, Max Planck Society, ou_421893              
2IMPRS on Ecological Interactions, MPI for Chemical Ecology, Max Planck Society, Jena, DE, ou_421900              

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 Abstract: Herbivory is well known to trigger increased emission of volatile organic compounds (VOCs) from plants, but we know little about the responses of mature trees. We measured the volatiles emitted by leaves of old-growth black poplar (Populus nigra) trees after experimental damage by gypsy moth (Lymantria dispar) caterpillars in a floodplain forest, and studied the effect of herbivory on the transcript abundance of two genes involved in the biosynthesis of VOCs, and the accumulation of defence phytohormones. Herbivory significantly increased volatile emission from the experimentally damaged foliage, but not from adjacent undamaged leaves in the damaged branches (i.e., no systemic response). Methylbutyraldoximes, 4,8-dimethyl-1,3,7-nonatriene (DMNT), (Z)-3-hexenol and (E)-β-ocimene, amongst other compounds, were found to be important in distinguishing the blend of herbivoredamaged vs. undamaged leaves. Herbivory also increased expression of PnTPS3 (described here for the first time) and PnCYP79D6-v4 genes at the damaged sites, these genes encode for an (E)-β-ocimene synthase and a P450 enzyme involved in aldoxime formation, respectively, demonstrating de novo biosynthesis of the volatiles produced. Herbivore-damaged leaves had significantly higher levels of jasmonic acid and its conjugate (−)-jasmonic acid-isoleucine. This study shows that mature trees in the field have a robust response to herbivory, producing induced volatiles at the damaged sites even after previous natural herbivory and under changing environmental conditions, however, further studies are needed to establish whether the observed absence of systemic responses is typical of mature poplar trees or if specific conditions are required for their induction.

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 Dates: 2019-04-252019-05-22
 Publication Status: Published online
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 Identifiers: Other: GER562
DOI: 10.1038/s41598-019-43931-y
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Title: Scientific Reports
  Abbreviation : Sci. Rep.
Source Genre: Journal
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Publ. Info: London, UK : Nature Publishing Group
Pages: - Volume / Issue: 9 Sequence Number: 7714 Start / End Page: - Identifier: ISSN: 2045-2322
CoNE: https://pure.mpg.de/cone/journals/resource/2045-2322