| Title: | Leaf rust infection reduces herbivore-induced volatile emission in black poplar and attracts a generalist herbivore |
| Author(s): | Eberl F; Hammerbacher A; Gershenzon J; Unsicker SB; |
| Address: | "Department of Biochemistry, Max Planck Institute for Chemical Ecology, Hans-Knoll-Str. 8, 07745, Jena, Germany" |
| ISSN/ISBN: | 1469-8137 (Electronic) 0028-646X (Linking) |
| Abstract: | "Plants release complex volatile blends after separate attack by herbivores and pathogens, which play many roles in interactions with other organisms. Large perennials are often attacked by multiple enemies, but the effect of combined attacks on volatile emission is rarely studied, particularly in trees. We infested Populus nigra trees with a pathogen, the rust fungus Melampsora larici-populina, and Lymantria dispar caterpillars alone and in combination. We investigated poplar volatile emission and its regulation, as well as the behavior of the caterpillars towards volatiles from rust-infected and uninfected trees. Both the rust fungus and the caterpillars alone induced volatile emission from poplar trees. However, the herbivore-induced volatile emission was significantly reduced when trees were under combined attack by the herbivore and the fungus. Herbivory induced terpene synthase transcripts as well as jasmonate concentrations, but these increases were suppressed when the tree was additionally infected with rust. Caterpillars preferred volatiles from rust-infected over uninfected trees. Our results suggest a defense hormone crosstalk upon combined herbivore-pathogen attack in poplar trees which results in lowered emission of herbivore-induced volatiles. This influences the preference of herbivores, and might have other far-reaching consequences for the insect and pathogen communities in natural poplar forests" |
| Keywords: | "Alkyl and Aryl Transferases/genetics/metabolism Animals Basidiomycota/physiology Cyclopentanes/metabolism Gene Expression Regulation, Plant *Herbivory Larva/physiology Moths/physiology Oxylipins/metabolism Plant Diseases/*microbiology Plant Leaves/*microb;" |
| Notes: | "MedlineEberl, Franziska Hammerbacher, Almuth Gershenzon, Jonathan Unsicker, Sybille B eng Max Planck Society/International Research Support, Non-U.S. Gov't England 2017/04/19 New Phytol. 2018 Nov; 220(3):760-772. doi: 10.1111/nph.14565. Epub 2017 Apr 18" |
