title: Attacks by a piercing-sucking insect (Myzus persicae Sultzer) or a chewing insect (Leptinotarsa decemlineata Say) on potato plants (Solanum tuberosum L.) induce differential changes in volatile compound release and oxylipin synthesis.
abstract: Plant defensive strategies bring into play blends of compounds dependent on the type of attacker and coming from different synthesis pathways. Interest in the field is mainly focused on volatile organic compounds (VOCs) and jasmonic acid (JA). By contrast, little is known about the oxidized polyunsaturated fatty acids (PUFAs), such as PUFA-hydroperoxides, PUFA-hydroxides, or PUFA-ketones. PUFA-hydroperoxides and their derivatives might be involved in stress response and show antimicrobial activities. Hydroperoxides are also precursors of JA and some volatile compounds. In this paper, the differential biochemical response of a plant against insects with distinct feeding behaviours is characterized not only in terms of VOC signature and JA profile but also in terms of their precursors synthesized through the lipoxygenase (LOX)-pathway at the early stage of the plant response. For this purpose, two leading pests of potato with distinct feeding behaviours were used: the Colorado Potato Beetle (Leptinotarsa decemlineata Say), a chewing herbivore, and the Green Peach Aphid (Myzus persicae Sulzer), a piercing-sucking insect. The volatile signatures identified clearly differ in function with the feeding behaviour of the attacker and the aphid, which causes the smaller damages, triggers the emission of a higher number of volatiles. In addition, 9-LOX products, which are usually associated with defence against pathogens, were exclusively activated by aphid attack. Furthermore, a correlation between volatiles and JA accumulation and the evolution of their precursors was determined. Finally, the role of the insect itself on the plant response after insect infestation was highlighted.
authors.affiliation: Plant Biology Unit, Gembloux Agricultural University, Passage des déportés 2, B-5030 Gembloux, Belgium.
authors.forename: Virginie
authors.initials: V
authors.lastname: Gosset
authors.forename: Nicolas
authors.initials: N
authors.lastname: Harmel
authors.forename: Cornelia
authors.initials: C
authors.lastname: Göbel
authors.forename: Frédéric
authors.initials: F
authors.lastname: Francis
authors.forename: Eric
authors.initials: E
authors.lastname: Haubruge
authors.forename: Jean-Paul
authors.initials: JP
authors.lastname: Wathelet
authors.forename: Patrick
authors.initials: P
authors.lastname: du Jardin
authors.forename: Ivo
authors.initials: I
authors.lastname: Feussner
authors.forename: Marie-Laure
authors.initials: ML
authors.lastname: Fauconnier
mesh_terms: D000818:Animals; D001042:Aphids / Q000502:physiology*; D001517:Coleoptera / Q000502:physiology*; D003517:Cyclopentanes / Q000378:metabolism; D003979:Diazonium Compounds / Q000378:metabolism; D005247:Feeding Behavior; D007700:Kinetics; D008041:Linoleic Acids / Q000378:metabolism; D008054:Lipid Peroxides / Q000378:metabolism; D008084:Lipoxygenase / Q000378:metabolism; D054883:Oxylipins / Q000378:metabolism*; D011725:Pyridines / Q000378:metabolism; D011198:Solanum tuberosum / Q000201:enzymology / Q000378:metabolism* / Q000469:parasitology*; D055549:Volatile Organic Compounds / Q000032:analysis*
chemical_list: C506899:9-hydroperoxy-10,12-octadecadienoic acid; D003517:Cyclopentanes; D003979:Diazonium Compounds; D008041:Linoleic Acids; D008054:Lipid Peroxides; D054883:Oxylipins; D011725:Pyridines; D055549:Volatile Organic Compounds; C056727:2-(2'-pyridyldithio)benzyldiazoacetate; C011006:jasmonic acid; D008084:Lipoxygenase