{"id":3700,"date":"2022-04-14T10:28:20","date_gmt":"2022-04-14T08:28:20","guid":{"rendered":"https:\/\/www.lvbe.uha.fr\/en\/?page_id=3700"},"modified":"2022-04-14T10:28:52","modified_gmt":"2022-04-14T08:28:52","slug":"ph-d-karine-bergeault","status":"publish","type":"page","link":"https:\/\/www.lvbe.uha.fr\/en\/team\/former-lvbe-ph-d-students\/ph-d-karine-bergeault\/","title":{"rendered":"Ph. D. Karine BERGEAULT"},"content":{"rendered":"<h2><strong>Identification of two NPR1 genes in the VITACEAE family, analyses of their sequence diversity and the interaction with VvTGA transcription factors<\/strong><\/h2>\n<p>Defended in November 2010<\/p>\n<p>Under the direction of Bernard WALTER<\/p>\n<p><strong>Abstract<\/strong><\/p>\n<p>Numerous diseases affect grapevine, resulting in the use of phytochemicals in large quantities that are harmful for environment and user&#8217;s health. In the long term, the aim is to develop alternative methods to chemicals. The protein encoded by NPR1 (Nonexpressor of pathogenesis-related gene 1) plays a pivotal role in conferring broad spectrum pathogen resistance in plants. Activation of NPR 1 in the cytoplasm is influenced by elicitors such as salicylic acid or pathogens associated with the accumulation of reactive oxygen species. Translocation of NPR1 into the nucleus and interaction with TGA transcription factors induce the expression of PR (Pathogenesis-related) genes. Using a candidate gene approach, we have identified seven putative homologs to NPR1 and TGA in the grapevine genome (VvNPR1.1, VvNPR1.2, VvTGA1 to 5). The study of sequence diversity in exons of 15 accessions of the<em> Vitaceae<\/em> family indicates that these exons are subjected to a strong purifying selection pressure. Moreover, in silico analysis in the promoters of VvNPR1 shows putative cis-regulator elements, in answer to biotic and abiotic stresses as well as link patterns to transcription factors. An intron study shows transposable elements and a low polymorphism in six accessions of <em>Vitis vinifera<\/em>. These results suggest a strong selection pressure on these genes. Functional hypotheses were formulated, and an interaction study with transcription factors VvTGA1 and VvTGA4 was conducted using a method based on yeast two hybrid, showing that they do not interact with VvNPR1.1.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Identification of two NPR1 genes in the VITACEAE family, analyses of their sequence diversity and the interaction with VvTGA transcription factors Defended in November 2010 Under the direction of Bernard WALTER Abstract Numerous diseases affect grapevine, resulting in the use of phytochemicals in large quantities that are harmful for environment and user&#8217;s health. In the [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"parent":44,"menu_order":5,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-3700","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Ph. D. Karine BERGEAULT - LVBE - Vine Biotechnology and Environment Laboratory<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.lvbe.uha.fr\/en\/team\/former-lvbe-ph-d-students\/ph-d-karine-bergeault\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ph. D. 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