{"id":113474,"date":"2026-02-25T16:39:34","date_gmt":"2026-02-25T16:39:34","guid":{"rendered":"https:\/\/www.africa-press.net\/cotedivoire\/politique\/tomates-infectees-previennent-voisines-du-virus"},"modified":"2026-02-25T18:57:47","modified_gmt":"2026-02-25T18:57:47","slug":"tomates-infectees-previennent-voisines-du-virus","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/cotedivoire\/toutes-les-actualites\/tomates-infectees-previennent-voisines-du-virus","title":{"rendered":"Tomates infect\u00e9es pr\u00e9viennent voisines du virus"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; C\u00f4te d&rsquo;Ivoire. <\/strong><\/span>Les tomates ne restent pas passives face aux attaques d\u2019aleurodes, ou mouches blanches. Comme les pucerons, ces insectes piqueurs de se\u0300ve transmettent de nombreux virus aux plantes. Or certaines varie\u0301te\u0301s de tomates peuvent alerter leurs voisines, indique une e\u0301tude publie\u0301e dans les PNAS par l&rsquo;universite\u0301 normale de Hangzhou en Chine. Une fois pique\u0301e par un aleurode infecte\u0301, la plante e\u0301met plus rapidement un signal volatile, le be\u0302ta-caryophylle\u0300ne. Ce compose\u0301 rend les autres plants de tomate capables de de\u0301clencher une re\u0301ponse antivirale plus intense si l\u2019insecte infecte\u0301 les attaque a\u0300 leur tour. Cette re\u0301ponse re\u0301duit alors fortement la propagation virale dans la plante et lui permet de maintenir sa production de graines.<\/p>\n<p><b>Une alerte de\u0301clenche\u0301e seulement en pre\u0301sence du virus<\/b><\/p>\n<p>Les chercheurs montrent aussi que ce signal pre\u0301coce d\u2019alerte est spe\u0301cifique de la pre\u0301sence des virus et qu\u2019il n\u2019est pas e\u0301mis si l\u2019aleurode n\u2019en porte pas. De fac\u0327on surprenante, cette mobilisation chez les plants voisins attaque\u0301s se fait au de\u0301triment de celle, de\u0301ja\u0300 connue, contre l\u2019insecte piqueur. Autrement dit, la de\u0301fense antivirale prend le pas sur la re\u0301ponse dirige\u0301e contre l\u2019aleurode. La priorite\u0301 donne\u0301e a\u0300 la de\u0301fense antivirale peut s\u2019expliquer, selon les chercheurs, par le danger nettement plus grave pour la plante d\u2019une infection virale ge\u0301ne\u0301ralise\u0301e que celui des simples piqu\u0302res superficielles provoque\u0301es par l\u2019insecte.<\/p>\n<p><b>Attirer un pre\u0301dateur pour lutter contre l\u2019aleurode<\/b><\/p>\n<p>La plante se de\u0301fend ne\u0301anmoins contre l\u2019aleurode de manie\u0300re indirecte en diffusant plus fortement un autre signal chimique, inconnu, qui attire une gue\u0302pe parasitoi\u0308de pre\u0301datrice de l\u2019insecte. Toutes les varie\u0301te\u0301s de tomates ne pre\u0301sentent pas une de\u0301fense aussi e\u0301labore\u0301e contre l\u2019aleurode et les virus qu\u2019il ve\u0301hicule qui restent, de fait, des fle\u0301aux majeurs pour leurs cultures.<\/p>\n<p>Cependant, les chercheurs sugge\u0300rent qu\u2019il est de\u0301sormais possible de leur confe\u0301rer cette proprie\u0301te\u0301 par des croisements approprie\u0301s avec les varie\u0301te\u0301s re\u0301sistantes qu\u2019ils ont identifie\u0301es. \u00ab\u00a0Ce travail repre\u0301sente une avance\u0301e majeure dans le domaine, te\u0301moigne la spe\u0301cialiste Ve\u0301ronique Brault de l\u2019Inrae, en de\u0301montrant qu\u2019il est possible d\u2019obtenir des plantes qui re\u0301sisteront aux insectes vecteurs en attirant leur pre\u0301dateur et qui permettront en paralle\u0300le de limiter la multiplication du virus dans les cultures.\u00a0\u00bb<\/p>\n<p><b>Source: Sciences et Avenir<\/b><\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <span style=\"color: #ff6600\">C\u00f4te d&rsquo;Ivoire<\/span>, suivez <span style=\"color: #ff6600\">Africa-Press<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; C\u00f4te d&rsquo;Ivoire. Les tomates ne restent pas passives face aux attaques d\u2019aleurodes, ou mouches blanches. Comme les pucerons, ces insectes piqueurs de se\u0300ve transmettent de nombreux virus aux plantes. Or certaines varie\u0301te\u0301s de tomates peuvent alerter leurs voisines, indique une e\u0301tude publie\u0301e dans les PNAS par l&rsquo;universite\u0301 normale de Hangzhou en Chine. Une [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":113473,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[29],"class_list":["post-113474","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-cote-divoire"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Tomates infect\u00e9es pr\u00e9viennent voisines du virus - C\u00f4te d&#039;Ivoire<\/title>\n<meta name=\"description\" content=\"Les tomates ne restent pas passives face aux attaques d\u2019aleurodes, ou mouches blanches. 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