Unknown,Transcriptomics,Genomics,Proteomics

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RNAs expression profiling in a resistant and a susceptible grapevine cultivar to Plasmopara viticola

ABSTRACT: Plasmopara viticola (Berk. and Curt.) Berl. and de Toni is the agent of the destructive disease known as grapevine downy mildew, for the control of which intensive fungicide treatments are required. Natural sources of resistance are available in several wild Vitis species, which are being used in traditional breeding approaches. However, molecular switches, signals and effectors involved in resistance are poorly understood. In this paper we report a microarray analysis of early transcriptional changes associated to P. viticola infection in both susceptible Vitis vinifera and resistant Vitis riparia plants (12 and 24 h post inoculation). To provide a biological basis to the choice of time points for transcriptome analyses, we performed microscopic examinations of infected tissues at 12, 24, 48 and 96 hpi. Data suggest that resistance in V. riparia is mainly a post-infectional event and involves a large reprogramming of host metabolism. Transcripts of signal transduction-related genes are specifically and often strongly accumulated in response to infection. Well known defence genes also show marked transcript increases, especially pathogenesis-related proteins PR-10 and stylbene synthases, and genes related to an hypersensitive reaction. On the other hand, V. vinifera mounts a much weaker transcriptional response, involving mainly defence genes, not effective enough in preventing pathogen infection. Leaves from one resistant (V. riparia cv. Gloire de Montpellier) and one susceptible (V.vinifera cv. Pinot Noir) grapevine cultivars grown in vitro were infected with the oomycete Plasmopara viticola, and transcriptome changes were investigated at 12h and 24h after infection. Three biological replicates were considered and each hybridization was performed twice. One color labeling was performed

ORGANISM(S): Vitis riparia

SUBMITTER: Anita Zamboni

PROVIDER: E-GEOD-18596 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

General and species-specific transcriptional responses to downy mildew infection in a susceptible (Vitis vinifera) and a resistant (V. riparia) grapevine species.

Polesani Marianna M Bortesi Luisa L Ferrarini Alberto A Zamboni Anita A Fasoli Marianna M Zadra Claudia C Lovato Arianna A Pezzotti Mario M Delledonne Massimo M Polverari Annalisa A

BMC genomics 20100218

<h4>Background</h4>Downy mildew is a destructive grapevine disease caused by Plasmopara viticola (Berk. and Curt.) Berl. and de Toni, which can only be controlled by intensive fungicide treatments. Natural sources of resistance from wild grapevine (Vitis) species are used in conventional breeding approaches, but the signals and effectors involved in resistance in this important crop species are not well understood.<h4>Results</h4>Early transcriptional changes associated with P. viticola infectio ...[more]

PMID: 20167053

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Project description:Downy mildew, caused by the oomycete Plasmopara viticola, is a serious disease in Vitis vinifera, the most commonly cultivated grapevine species. Several wild Vitis species have instead shown resistance to this pathogen and they have been used as a source to introgress resistance into a V. vinifera background. Stilbenoids represent the major phytoalexins in grapevine, and their toxicity has been strictly related to the specific compound. The aim of this study was to assess the resistance response to P. viticola of the Merzling x Teroldego cross by profiling the stilbenoid content of the leaves of the entire population and the transcriptome of resistant and susceptible individuals following infection. A three-year analysis of the population?s response to artificial inoculation showed that individuals were distributed in nine classes ranging from total resistance to total susceptibility. In addition, quantitative metabolite profiling of stilbenoids in the population, carried out using HPLC-DAD-MS, identified three distinct groups differing according to the concentrations present and the complexity of their profiles. The high producers were characterized by the presence of trans-resveratrol, trans-piceid, trans-pterostilbene and up to thirteen different viniferins, nine of them new in grapevine. Accumulation of these compounds is consistent with a resistant phenotype and suggests that they may contribute to the resistance response. A preliminary transcriptional study using cDNA-AFLP selected a set of genes modulated by the oomycete in a resistant genotype. The expression of this set of genes in resistant and susceptible genotypes of the progeny population was then assessed by comparative microarray analysis. A group of 57 genes was found to be exclusively modulated in the resistant genotype suggesting that they are involved in the grapevine-P. viticola incompatible interaction. Functional annotation of these transcripts revealed that they belong to the categories defense response, photosynthesis, primary and secondary metabolism, signal transduction and transport.This set of genes should be taken into account in future breeding programs. Leaves from one resistant (F1 21/66) and two susceptible (F1 22/73 and Teroldego) genotypes were infected with Plasmopara viticola, and transcriptome changes were investigated at 12h and 96h after infection (treated samples) and at 0h after spraying with water (control samples) Two biological replicates were considered and each hybridization was performed three times. One color labeling was performed.

Project description:Grapevine downy mildew caused by the Oomycete Plasmopara viticola is one of the most important diseases affecting Vitis spp. However, all cultivated European grapevine varieties are susceptible to P. viticola and the resistance needs to be introduced from other Vitaceae. Segregating populations derived from Muscadinia rotundifolia, a species closely related to Vitis, lead to the identification and mapping of two resistance genes, named Rpv1 and Rpv2. The macroscopic phenotypes of the resistance mediated by the two loci are different. Rpv2 plants completely inhibit P. viticola sporulation and produce very small necrotic lesions. In contrast, Rpv1 plants allow a rather limited but visible sporulation of P. viticola. The aim of the study is to understand the gene expression changes associated with downy mildew resistance mediated by these two loci. Gene expression patterns after P. viticola inoculation or mock inoculation are compared in incompatible (resistant plants bearing Rpv1 or Rpv2 locus) and compatible (susceptible plants with no resistance loci) interactions, using the Vitis vinifera GeneChip from Affymetrix. In order to limit the effect of the genetic background, the plant material consists in three pools of genotypes called B, C and D, respectively corresponding to partially resistant plants (Rpv1+/Rpv2-), totally resistant plants (Rpv1-/Rpv2+), and susceptible plants (Rpv1-/Rpv2-) derived from a segregating population. Each pool consists in 3 different genotypes. Plant leaf discs were inoculated with P. viticola sporangium suspension (i) or mock-inoculated with water (ni) and analysed 6 hours post-inoculation. For each experimental condition, we performed two biological replicates. Experiment Overall Design: 3 plant genotypes were analyzed: Rpv1+/Rpv2- (B), Rpv1-/Rpv2+ (C), and Rpv1-/Rpv2- (D). Plants were either inoculated with P. viticola (i) or mock-inoculated with water (ni). Biological replicates were performed for each experimental condition.

Dataset Information

RNAs expression profiling in a resistant and a susceptible grapevine cultivar to Plasmopara viticola

Publications

General and species-specific transcriptional responses to downy mildew infection in a susceptible (Vitis vinifera) and a resistant (V. riparia) grapevine species.

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