title: Effects of the virus satellite gene βC1 on host plant defense signaling and volatile emission.
abstract: Tomato Yellow Leaf Curl China virus spreads together with its invasive vector, the silverleaf whitefly B biotype, which exhibits higher growth rates on infected plants. Previous studies indicate that the virus satellite gene βC1 accounts for the visible symptoms of infection and inhibits the constitutive expression of jasmonic acid (JA)--a phytohormone involved in plant defense against whiteflies--and of some JA-regulated genes. Here we present new details of the effects of on plant signaling and defense, obtained with (non-host) transgenic Arabidopsis thaliana and Nicotiana benthamiana plants. We found that JA induction in response to wounding was reduced in plants expressing βC1. This result implies that βC1 acts on conserved plant regulation mechanisms and might impair the entire JA defense pathway. Furthermore, transformed N. benthamiana plants exhibited elevated emissions of the volatile compound linalool, suggesting that βC1 also influences plant-derived olfactory cues available to vector and non-vector insects.
authors.affiliation: Department of Entomology; Pennsylvania State University; University Park, PA USA; Laboratoire Ecologie; Systématique et Evolution; Universite Paris-Sud; Orsay, France.
authors.forename: Lucie
authors.initials: L
authors.lastname: Salvaudon
authors.forename: Consuelo M
authors.initials: CM
authors.lastname: De Moraes
authors.forename: Jun-Yi
authors.initials: JY
authors.lastname: Yang
authors.forename: Nam-Hai
authors.initials: NH
authors.lastname: Chua
authors.forename: Mark C
authors.initials: MC
authors.lastname: Mescher
mesh_terms: D000080462:Acyclic Monoterpenes; D000818:Animals; D017360:Arabidopsis / Q000235:genetics* / Q000378:metabolism / Q000821:virology; D003517:Cyclopentanes / Q000378:metabolism*; D060467:Disease Resistance / Q000235:genetics*; D018506:Gene Expression Regulation, Plant; D005814:Genes, Viral; D006430:Hemiptera; D060434:Herbivory; D018551:Solanum lycopersicum / Q000235:genetics / Q000378:metabolism / Q000821:virology; D039821:Monoterpenes / Q000378:metabolism; D009822:Oils, Volatile / Q000378:metabolism*; D054883:Oxylipins / Q000378:metabolism*; D010935:Plant Diseases / Q000235:genetics / Q000821:virology; D030821:Plants, Genetically Modified; D012526:Satellite Viruses / Q000235:genetics / Q000378:metabolism; D015398:Signal Transduction; D014026:Nicotiana / Q000235:genetics* / Q000378:metabolism / Q000821:virology
chemical_list: D000080462:Acyclic Monoterpenes; D003517:Cyclopentanes; D039821:Monoterpenes; D009822:Oils, Volatile; D054883:Oxylipins; C011006:jasmonic acid; C018584:linalool
keywords: Arabidopsis thaliana; Nicotiana benthamiana; Tomato yellow leaf curl China virus; olfactory cues; phytohormone signaling