Project description:Study of gene expression during Plasmopara viticola infection in the resistant Vitis vinifera cultivar 'Regent'. The oomycete fungus Plasmopara viticola (Berk. et Curt.) Berl. et de Toni is responsible for grapevine downy mildew disease. Most of the cultivated grapevines are sensitive to this pathogen, thus requiring intensive fungicide treatments. The molecular basis of resistance to this pathogen is poorly understood. We have carried out a cDNA microarray transcriptome analysis to identify grapevine genes associated with resistance traits. Early transcriptional changes associated with downy mildew infection in the resistant Vitis vinifera cultivar ‘Regent’, when compared to the susceptible cultivar ‘Trincadeira’, were analyzed. Transcript levels were measured at three time-points: 0, 6 and 12 hours post inoculation (hpi). Our data indicate that resistance in V. vinifera ‘Regent’ is induced after infection. This study provides the identification of several candidate genes that may be related to ‘Regent’ defense mechanisms, allowing a better understanding of this cultivar's resistance traits.
Project description:Study of gene expression during Plasmopara viticola infection in the resistant Vitis vinifera cultivar 'Regent'. The oomycete fungus Plasmopara viticola (Berk. et Curt.) Berl. et de Toni is responsible for grapevine downy mildew disease. Most of the cultivated grapevines are sensitive to this pathogen, thus requiring intensive fungicide treatments. The molecular basis of resistance to this pathogen is poorly understood. We have carried out a cDNA microarray transcriptome analysis to identify grapevine genes associated with resistance traits. Early transcriptional changes associated with downy mildew infection in the resistant Vitis vinifera cultivar M-bM-^@M-^XRegentM-bM-^@M-^Y, when compared to the susceptible cultivar M-bM-^@M-^XTrincadeiraM-bM-^@M-^Y, were analyzed. Transcript levels were measured at three time-points: 0, 6 and 12 hours post inoculation (hpi). Our data indicate that resistance in V. vinifera M-bM-^@M-^XRegentM-bM-^@M-^Y is induced after infection. This study provides the identification of several candidate genes that may be related to M-bM-^@M-^XRegentM-bM-^@M-^Y defense mechanisms, allowing a better understanding of this cultivar's resistance traits. 3 time points: 0, 6 and 12 hours post inoculation by P. viticola. Two cultivars: control (Trinacedira) and test (Regent). Two biological replicates were performed at 0 hpi, and 3 biological replicates at 6 and 12hpi. At 12hpi, three technical replicates also were performed.
Project description:Genome-wide expression profiling of Vitis vinifera L. cv. Cabernet Sauvignon (CS) and two rootstocks, Kober 5BB and 41B, exposed to seven days of water deficit or to increasing salinity reaching 120 mM NaCl. Shoot tissue was profiled on the Affymetrix GeneChip Vitis vinifera Genome Array to identify shared and genotype-specific transcriptional responses to the two stresses.
Project description:Physiological changes in trunk wood of Vitis vinifera L. cv. Chardonnay in response to esca proper and apoplexy revealed by proteomic and transcriptomic analyses
Project description:Downy mildew, caused by the obligate biotrophic oomycete Plasmopara viticola, is one of the most destructive grapevine diseases worldwide, constituting a major challenge to viticulture. Because an increasing number of pesticides are removed from market due to their impact on human health and/or the environment, there is an increasing need for alternative strategies to control fungal diseases. Silica nanoparticles (SiO2 NPs) and Frangula anlus extract (Fa) are emerging as promising tools for sustainable plant disease management. While their ability to enhance disease resistance has been demonstrated in several crop species, their potential in grapevine (Vitis vinifera) remains poorly investigated. In this study, foliar application of SiO2 NPs and Fa significantly reduced P. viticola infection in grapevine under both controlled and field conditions. Among multiple assays to characerize their effects, transcriptomic response of SiO2 NP-treated and Fa-Treated, infected and non-infected leaves were evaluated and compared to transcriptomic response of acibenzolar-S-methyl (B) treatment, a well known plant-defence activator. Overall, these findings provide new insights into SiO2 NP-induced and Fa-induced responses in grapevine and highlight their potential for sustainable disease management.
Project description:In order to investigate the putative roles of the VvPLCP genes in grapevine resistance, the leaves-specific expression patterns of VvPLCPs were analyzed according to transcriptome data in two cultivars including V. vinifera cv. ‘Zitian Seedless’ and Vitis rootstocks ‘Kober 5BB’ when infected with P. viticola
