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Curr Biol

Title:		Evolutionary changes in an invasive plant support the defensive role of plant volatiles
Author(s):		Lin T; Vrieling K; Laplanche D; Klinkhamer PGL; Lou Y; Bekooy L; Degen T; Bustos-Segura C; Turlings TCJ; Desurmont GA;
Address:		"State Key Laboratory of Rice Biology & Ministry of Agriculture Key Lab of Molecular Biology of Crop Pathogens and Insects, Institute of Insect Science, Zhejiang University, Hangzhou 310058, China; National Forestry and Grassland Administration Key Laboratory of Forest Resources Conservation and Ecological Safety on the Upper Reaches of the Yangtze River, College of Forestry, Sichuan Agricultural University, 611130 Chengdu, China; Laboratory for Fundamental and Applied Research in Chemical Ecology, Faculty of Science, University of Neuchatel, Rue Emile-Argand 11, 2000 Neuchatel, Switzerland. Institute of Biology, Plant Cluster, Leiden University, PO Box 9505, 2300 Leiden, the Netherlands. Electronic address: k.vrieling@biology.leidenuniv.nl. Laboratory for Fundamental and Applied Research in Chemical Ecology, Faculty of Science, University of Neuchatel, Rue Emile-Argand 11, 2000 Neuchatel, Switzerland. Institute of Biology, Plant Cluster, Leiden University, PO Box 9505, 2300 Leiden, the Netherlands. State Key Laboratory of Rice Biology & Ministry of Agriculture Key Lab of Molecular Biology of Crop Pathogens and Insects, Institute of Insect Science, Zhejiang University, Hangzhou 310058, China. Electronic address: yglou@zju.edu.cn. Laboratory for Fundamental and Applied Research in Chemical Ecology, Faculty of Science, University of Neuchatel, Rue Emile-Argand 11, 2000 Neuchatel, Switzerland. Electronic address: ted.turlings@unine.ch"
Journal Title:		Curr Biol
Year:		2021
Volume:		20210618
Issue:		15
Page Number:		3450 - 3456
DOI:		10.1016/j.cub.2021.05.055
ISSN/ISBN:		1879-0445 (Electronic) 0960-9822 (Print) 0960-9822 (Linking)
Abstract:		"It is increasingly evident that plants interact with their outside world through the production of volatile organic compounds,(1-5) but whether the volatiles have evolved to serve in plant defense is still a topic of considerable debate.(3)(,)(6-8) Unharmed leaves constitutively release small amounts of volatiles, but when the leaves are damaged by herbivorous arthropods, they emit substantially more volatiles. These herbivore-induced plant volatiles (HIPVs) attract parasitoids and predators that kill insect herbivores,(9-12) and this can benefit the plants.(13)(,)(14) As yet, however, there is no tangible evolutionary evidence that this tritrophic interplay contributes to the selection forces that have shaped the volatile emissions of plants.(2)(,)(3)(,)(5-8)(,)(15) With this in mind, we investigated the evolutionary changes in volatile emissions in invasive common ragwort and the respective defensive roles of its constitutive and inducible volatiles. This Eurasian plant has invaded other continents, where it evolved for many generations in the absence of specialized herbivores and their natural enemies. We found that, compared to native ragworts, invasive plants release higher levels of constitutive volatiles but considerably lower levels of herbivore-induced volatiles. As a consequence, invasive ragwort is more attractive to a specialist moth but avoided by an unadapted generalist moth. Importantly, conforming to the indirect defense hypothesis, a specialist parasitoid was much more attracted to caterpillar-damaged native ragwort, which was reflected in higher parasitism rates in a field trial. The evolution of foliar volatile emissions appears to be indeed driven by their direct and indirect roles in defenses against insects"
Keywords:		"Animals Evolution, Molecular Herbivory Insecta Introduced Species *Moths Plant Leaves Senecio/*chemistry *Volatile Organic Compounds Cotesia popularis Jacobaea vulgaris Mamestra brassicae Tyria jacobaeae cinnabar moth constitutive plant volatiles herbivor;"
Notes:		"MedlineLin, Tiantian Vrieling, Klaas Laplanche, Diane Klinkhamer, Peter G L Lou, Yonggen Bekooy, Leon Degen, Thomas Bustos-Segura, Carlos Turlings, Ted C J Desurmont, Gaylord A eng Research Support, Non-U.S. Gov't England 2021/06/20 Curr Biol. 2021 Aug 9; 31(15):3450-3456.e5. doi: 10.1016/j.cub.2021.05.055. Epub 2021 Jun 18"