{"id":15933,"date":"2017-04-19T09:16:34","date_gmt":"2017-04-19T13:16:34","guid":{"rendered":"https:\/\/cna.ca\/?post_type=news&#038;p=15933\/"},"modified":"2020-03-10T13:55:02","modified_gmt":"2020-03-10T17:55:02","slug":"la-science-nucleaire-et-votre-cafe","status":"publish","type":"post","link":"https:\/\/cna.ca\/fr\/2017\/04\/19\/la-science-nucleaire-et-votre-cafe\/","title":{"rendered":"La science nucl\u00e9aire et votre&nbsp;caf\u00e9"},"content":{"rendered":"<p>Pour la plupart d\u2019entre nous, vivre sans sa tasse de caf\u00e9 le matin est impensable. Selon l\u2019Organisation internationale du caf\u00e9 (OIC), environ 9 millions de sacs de caf\u00e9 sont export\u00e9s \u00e0 travers le monde chaque mois. La d\u00e9pendance de la caf\u00e9ine augmente \u00e0 un taux juste en-dessous de deux pour cent par an; voici qui fait de notre stimulant matinal une industrie bourgeonnante.<\/p>\n<p>Par contre, une maladie nomm\u00e9e la <em>rouille de feuilles<\/em> pourrait vous enlever cette tasse de caf\u00e9. <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Hemileia_vastatrix\">La rouille de feuilles de caf\u00e9i\u00e8re,<\/a> ou <em>Hemileia vastatrix<\/em> est un champignon qui attaque les feuilles des caf\u00e9i\u00e8res. Le premier cas document\u00e9 remonte \u00e0 la fin des ann\u00e9es\u00a01800; la rouille de feuilles peut causer d\u2019\u00e9normes d\u00e9g\u00e2ts \u00e0 la production de caf\u00e9. Nouvelle largement diffus\u00e9e, le Sri Lanka s\u2019est vu oblig\u00e9 d\u2019arr\u00eater la production de caf\u00e9 \u00e0 cause de l\u2019\u00e9pid\u00e9mie d\u00e9sastreuse de la rouille de feuilles dans les ann\u00e9es\u00a01860.<\/p>\n<div id=\"attachment_15932\" style=\"width: 310px\" class=\"wp-caption alignright\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-15932\" class=\"size-medium wp-image-15932\" src=\"https:\/\/cna.ca\/wp-content\/uploads\/2017\/01\/Courtesy-krutar-300x199.jpg\" alt=\"\" width=\"300\" height=\"199\" srcset=\"https:\/\/cna.ca\/wp-content\/uploads\/2017\/01\/Courtesy-krutar-300x199.jpg 300w, https:\/\/cna.ca\/wp-content\/uploads\/2017\/01\/Courtesy-krutar-768x510.jpg 768w, https:\/\/cna.ca\/wp-content\/uploads\/2017\/01\/Courtesy-krutar-1024x680.jpg 1024w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><p id=\"caption-attachment-15932\" class=\"wp-caption-text\">Credit: Krutar\/Shutterstock<\/p><\/div>\n<p>En 2013, le Guatemala \u00e9tait un pays parmi plusieurs \u00e0 d\u00e9clarer un \u00e9tat d\u2019urgence agriculture nationale \u00e0 la suite d\u2019une \u00e9pid\u00e9mie caus\u00e9e par cet organisme qui a d\u00e9truit environ 70 pour cent de la r\u00e9colte de caf\u00e9 dans la r\u00e9gion. Les effets de ce champignon sont consid\u00e9rables. Au cours des quatre derni\u00e8res ann\u00e9es, divers pays en Am\u00e9rique latine et dans les Cara\u00efbes ont perdu <a href=\"http:\/\/observer.com\/2015\/09\/central-americas-slow-recovery-from-coffee-ravaging-epidemic\/\">un revenu d\u2019\u00e0 peu pr\u00e8s 1 milliard de dollars<\/a>.<\/p>\n<p>Cet organisme attaque les feuilles des caf\u00e9i\u00e8res, laissant derri\u00e8re une l\u00e9sion ou un point de couleur orang\u00e9e sur le bas de la feuille. Ces l\u00e9sions r\u00e9duisent la capacit\u00e9 de photosynth\u00e8se de ces plantes, le processus par lequel les plantes transforment la lumi\u00e8re et l\u2019eau pour produire de l\u2019oxyg\u00e8ne, du sucre et du dioxyde de carbone. R\u00e9duire la photosynth\u00e8se, la capacit\u00e9 de la plante de se nourrir, a comme r\u00e9sultat une r\u00e9colte plus faible \u00e0 cause de la diminution du d\u00e9veloppement v\u00e9g\u00e9tatif. Les effets \u00e0 long terme de l\u2019infection incluent la mort des bourgeons et des racines de la plante, diminuant ainsi la quantit\u00e9 de la production de caf\u00e9 globale.<\/p>\n<p>La science nucl\u00e9aire lutte contre la rouille de feuilles des caf\u00e9i\u00e8res.<\/p>\n<p><a href=\"https:\/\/www.iaea.org\/newscenter\/pressreleases\/iaea-training-addresses-devastating-coffee-disease\">L\u2019Agence internationale de l\u2019\u00e9nergie atomique<\/a> (AIEA), en liaison avec l\u2019<a href=\"http:\/\/www.fao.org\/home\/fr\/\">Organisation des Nations Unies pour l\u2019alimentation et l\u2019agriculture (FAO)<\/a> et d\u2019autres partenaires souhaitent une solution nucl\u00e9aire\u00a0: le croisement de plantes r\u00e9sistantes \u00e0 ce champignon mortel. Une \u00e9quipe d\u2019experts se sont r\u00e9unis en d\u00e9but d\u2019octobre avec le but de produire une plante de caf\u00e9 r\u00e9sistante par une technique nucl\u00e9aire nomm\u00e9e la s\u00e9lection v\u00e9g\u00e9tale par mutagen\u00e8se.<\/p>\n<p>La s\u00e9lection v\u00e9g\u00e9tale par mutagen\u00e8se utilise des petites doses de radiation pour modifier l\u2019ADN ou le patrimoine g\u00e9n\u00e9tique d\u2019une plante, afin de la rendre plus r\u00e9sistante aux maladies et aux ravageurs telles que la rouille de feuilles.<\/p>\n<p>\u00ab\u00a0La s\u00e9lection v\u00e9g\u00e9tale par mutagen\u00e8se est une fa\u00e7on rapide de d\u00e9velopper de meilleures vari\u00e9t\u00e9s avec de nouveaux traits utiles\u00a0\u00bb, annonce Stephan Nielen, g\u00e9n\u00e9ticien responsable de la formation \u00e0 l\u2019AIEA\/FAO. \u00ab\u00a0Cette m\u00e9thode offre aussi une approche largement accept\u00e9e, \u00e9conomique et durable de la protection des r\u00e9coltes et des quantit\u00e9s ad\u00e9quates libres de pesticides\u00a0\u00bb.<\/p>\n<p>Le travail en laboratoire est essentiel. Le changement climatique a d\u2019ores et d\u00e9j\u00e0 un effet sur les r\u00e9gions productrices de caf\u00e9. Plus de chaleur et plus de pr\u00e9cipitation augmentent l\u2019incidence de ravageurs et de maladies comme la rouille de feuilles et menacent la subsistance d\u2019environ 120 millions de personnes qui comptent, souvent, parmi les plus pauvres du monde et d\u00e9pendent des revenus du caf\u00e9. L\u2019augmentation des temp\u00e9ratures et la pluie a fourni un environnement propice \u00e0 la propagation de cette maladie d\u00e9sastreuse. Le probl\u00e8me \u00e9tait tellement s\u00e9v\u00e8re en 2010 que plusieurs pays sont venus ensemble pour former l\u2019initiative <a href=\"http:\/\/www.coffeeandclimate.org\/about-cc.html\">coffee &amp; climat<\/a>, une r\u00e9ponse au changement climatique et aux r\u00e9percussions sur l\u2019industrie du caf\u00e9. L\u2019initiative a pour but d\u2019aider plus de 70\u00a0000 cultivateurs composer avec le changement climatique.<\/p>\n<p>Le travail dans les laboratoires e3n coop\u00e9ration avec l\u2019AIEA va aussi fournir un autre outil pour l\u2019industrie du caf\u00e9\u00a0: des plantes g\u00e9n\u00e9tiquement plus diverses et r\u00e9sistantes, qui seront un grand aide pour l\u2019environnement et pour ceux qui en d\u00e9pendent pour leur subsistance.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Pour la plupart d\u2019entre nous, vivre sans sa tasse de caf\u00e9 le matin est impensable. Selon l\u2019Organisation internationale du caf\u00e9 (OIC), environ 9 millions de sacs de caf\u00e9 sont export\u00e9s \u00e0 travers le monde chaque mois. La d\u00e9pendance de la caf\u00e9ine augmente \u00e0 un taux juste en-dessous de deux pour cent par an; voici qui fait de notre stimulant matinal une industrie bourgeonnante.<\/p>\n","protected":false},"author":1,"featured_media":16461,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[244],"tags":[],"topic":[],"class_list":["post-15933","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-contenu-vedette"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>La science nucl\u00e9aire et votre caf\u00e9 - Association nucl\u00e9aire canadienne<\/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:\/\/cna.ca\/fr\/2017\/04\/19\/la-science-nucleaire-et-votre-cafe\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"La science nucl\u00e9aire et votre caf\u00e9 - Association nucl\u00e9aire canadienne\" \/>\n<meta property=\"og:description\" content=\"Pour la plupart d\u2019entre nous, vivre sans sa tasse de caf\u00e9 le matin est impensable. Selon l\u2019Organisation internationale du caf\u00e9 (OIC), environ 9 millions de sacs de caf\u00e9 sont export\u00e9s \u00e0 travers le monde chaque mois. 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Association nucl\u00e9aire canadienne","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/cna.ca\/fr\/2017\/04\/19\/la-science-nucleaire-et-votre-cafe\/","og_locale":"fr_FR","og_type":"article","og_title":"La science nucl\u00e9aire et votre caf\u00e9 - Association nucl\u00e9aire canadienne","og_description":"Pour la plupart d\u2019entre nous, vivre sans sa tasse de caf\u00e9 le matin est impensable. Selon l\u2019Organisation internationale du caf\u00e9 (OIC), environ 9 millions de sacs de caf\u00e9 sont export\u00e9s \u00e0 travers le monde chaque mois. 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