| Title: | Volatile responses of dwarf birch to mimicked insect herbivory and experimental warming at two elevations in Greenlandic tundra |
| Author(s): | Rieksta J; Li T; Davie-Martin CL; Aeppli LCB; Hoye TT; Rinnan R; |
| Address: | "Terrestrial Ecology Section, Department of Biology University of Copenhagen Copenhagen Denmark. Center for Permafrost (CENPERM) Department of Geosciences and Natural Resource Management University of Copenhagen Copenhagen K Denmark. Sichuan Zoige Alpine Wetland Ecosystem National Observation and Research Station Key Laboratory for Bio-resource and Eco-environment of Ministry of Education College of Life Sciences Sichuan University Chengdu China. Department of Bioscience and Arctic Research Centre Aarhus University Aarhus C Denmark" |
| ISSN/ISBN: | 2575-6265 (Electronic) 2575-6265 (Linking) |
| Abstract: | "Plants release a complex blend of volatile organic compounds (VOCs) in response to stressors. VOC emissions vary between contrasting environments and increase with insect herbivory and rising temperatures. However, the joint effects of herbivory and warming on plant VOC emissions are understudied, particularly in high latitudes, which are warming fast and facing increasing herbivore pressure. We assessed the individual and combined effects of chemically mimicked insect herbivory, warming, and elevation on dwarf birch (Betula glandulosa) VOC emissions in high-latitude tundra ecosystems in Narsarsuaq, South Greenland. We hypothesized that VOC emissions and compositions would respond synergistically to warming and herbivory, with the magnitude differing between elevations. Warming increased emissions of green leaf volatiles (GLVs) and isoprene. Herbivory increased the homoterpene, (E)-4,8-dimethyl-1,3,7-nonatriene, emissions, and the response was stronger at high elevation. Warming and herbivory had synergistic effects on GLV emissions. Dwarf birch emitted VOCs at similar rates at both elevations, but the VOC blends differed between elevations. Several herbivory-associated VOC groups did not respond to herbivory. Harsher abiotic conditions at high elevations might not limit VOC emissions from dwarf birch, and high-elevation plants might be better at herbivory defense than assumed. The complexity of VOC responses to experimental warming, elevation, and herbivory are challenging our understanding and predictions of future VOC emissions from dwarf birch-dominated ecosystems" |
| Keywords: | Arctic biotic stress dwarf birch insect herbivory methyl jasmonate stress severity volatile organic compounds; |
| Notes: | "PubMed-not-MEDLINERieksta, Jolanta Li, Tao Davie-Martin, Cleo L Aeppli, Laurids Christian Brogaard Hoye, Toke Thomas Rinnan, Riikka eng 2023/06/07 Plant Environ Interact. 2023 Feb 8; 4(1):23-35. doi: 10.1002/pei3.10100. eCollection 2023 Feb" |
