Cultivar-specific kinetics of gene induction during downy mildew early infection in grapevine

• DOI: 10.1007/s10142-012-0261-8
• Publication Date: 2012-01-16T12:02:54Z
• Authors: Andreia Figueiredo; Filipa Monteiro; Ana Margarida Fortes; Martina Bonow-Rex; Eva Zyprian; Lisete Sousa; Maria Salomé Pais
• Keywords: Transcriptional Activation; 0301 basic medicine; Gene Expression Profiling; Gene Expression; Sequence Analysis, DNA; Genes, Plant; Kinetics; 03 medical and health sciences; Oomycetes; Gene Expression Regulation, Plant; Host-Pathogen Interactions; Vitis; Disease Resistance; Oligonucleotide Array Sequence Analysis; Plant Diseases

The oomycete pathogen Plasmopara viticola (Berk. et Curt.) Berl. et de Toni is the causing agent of the destructive downy mildew disease in grapevine. Despite the advances towards elucidation of grapevine resistance mechanisms to downy mildew, increased knowledge of the biological and genetic components of the pathosystem is important to design suitable breeding strategies. Previously, a cDNA microarray approach was used to compare two Vitis vinifera genotypes Regent and Trincadeira (resistant and susceptible to downy mildew, respectively) in field conditions. The same cDNA microarray chip was used to confirm field-based results and to compare both genotypes under greenhouse conditions at 0, 6, and 12 h post-inoculation with P. viticola. Results show that when comparing both cultivars after pathogen inoculation, there is a preferential modulation of several defense, signaling, and metabolism associated transcripts in Regent. Early transcriptional changes are discussed in terms of genetic background and resistance mechanism. This study is the first to directly compare resistant and susceptible cultivars responses as early as 6 hpi with P. viticola, providing several candidate genes potentially related to the expression of resistance traits.