title: Elevated ozone alters soybean-virus interaction.
abstract: Increasing concentrations of ozone (O(3)) in the troposphere affect many organisms and their interactions with each other. To analyze the changes in a plant-pathogen interaction, soybean plants were infected with Soybean mosaic virus (SMV) while they were fumigated with O(3). In otherwise natural field conditions, elevated O(3) treatment slowed systemic infection and disease development by inducing a nonspecific resistance against SMV for a period of 3 weeks. During this period, the negative effect of virus infection on light-saturated carbon assimilation rate was prevented by elevated O(3) exposure. To identify the molecular basis of a soybean nonspecific defense response, high-throughput gene expression analysis was performed in a controlled environment. Transcripts of fungal, bacterial, and viral defense-related genes, including PR-1, PR-5, PR-10, and EDS1, as well as genes of the flavonoid biosynthesis pathways (and concentrations of their end products, quercetin and kaempherol derivatives) increased in response to elevated O(3). The drastic changes in soybean basal defense response under altered atmospheric conditions suggest that one of the elements of global change may alter the ecological consequences and, eventually, coevolutionary relationship of plant-pathogen interactions in the future.
authors.affiliation: Institute of Genomic Biolog, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
authors.forename: Damla D
authors.initials: DD
authors.lastname: Bilgin
authors.forename: Mihai
authors.initials: M
authors.lastname: Aldea
authors.forename: Bridget F
authors.initials: BF
authors.lastname: O'Neill
authors.forename: Marisol
authors.initials: M
authors.lastname: Benitez
authors.forename: Min
authors.initials: M
authors.lastname: Li
authors.forename: Steven J
authors.initials: SJ
authors.lastname: Clough
authors.forename: Evan H
authors.initials: EH
authors.lastname: DeLucia
mesh_terms: D002853:Chromatography, Liquid; D004797:Enzyme-Linked Immunosorbent Assay; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D054884:Host-Pathogen Interactions / Q000187:drug effects*; D013058:Mass Spectrometry; D008954:Models, Biological; D009029:Mosaic Viruses / Q000502:physiology*; D020411:Oligonucleotide Array Sequence Analysis; D010126:Ozone / Q000494:pharmacology*; D020005:Propanols / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013025:Glycine max / Q000187:drug effects / Q000235:genetics / Q000821:virology*
chemical_list: D020005:Propanols; C439395:1-phenylpropanol; D010126:Ozone