{"id":97522,"date":"2025-04-13T14:15:06","date_gmt":"2025-04-13T14:15:06","guid":{"rendered":"https:\/\/www.africa-press.net\/cotedivoire\/politique\/un-riz-qui-emet-peu-de-methane-cest-possible"},"modified":"2025-04-13T14:15:06","modified_gmt":"2025-04-13T14:15:06","slug":"un-riz-qui-emet-peu-de-methane-cest-possible","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/cotedivoire\/toutes-les-actualites\/un-riz-qui-emet-peu-de-methane-cest-possible","title":{"rendered":"Un riz qui \u00e9met peu de m\u00e9thane, c&rsquo;est possible"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; C\u00f4te d&rsquo;Ivoire. <\/strong><\/span>La culture du riz est la deuxie\u0300me source de me\u0301thane de\u0301gage\u0301 par l\u2019agriculture apre\u0300s l\u2019e\u0301levage, mais ses e\u0301missions peuvent e\u0302tre re\u0301duites de 70%, montre une e\u0301quipe sue\u0301do-chinoise dans la revue Molecular Plant. Ce gaz a\u0300 effet de serre 80 fois plus puissant que le CO2 sur 20 ans dans l\u2019atmosphe\u0300re est fabrique\u0301 par des micro-organismes, les arche\u0301es, qui se nourrissent des exudats racinaires issus de la plante.<\/p>\n<p>Les conditions de cette production par les rizie\u0300res inonde\u0301es restaient myste\u0301rieuses. En comparant deux varie\u0301te\u0301s de riz qui montraient un fort de\u0301gagement du gaz ou pas, les chercheurs ont de\u0301couvert qu\u2019il e\u0301tait associe\u0301 a\u0300 la production dans le milieu par les racines d\u2019une petite mole\u0301cule, le fumarate. Le blocage par un inhibiteur, l\u2019oxantel, de la fabrication enzymatique du fumarate a fait chuter le de\u0301gagement de me\u0301thane lie\u0301 a\u0300 la plante tandis que l\u2019ajout de fumarate l\u2019a stimule\u0301.<\/p>\n<p><b>Des croisements entre varie\u0301te\u0301s de riz<\/b><\/p>\n<p>De plus, la varie\u0301te\u0301 a\u0300 faible de\u0301gagement de me\u0301thane libe\u0301rait aussi de l\u2019e\u0301thanol au niveau de ses racines, mole\u0301cule dont l\u2019effet inhibiteur sur la production du gaz a aussi e\u0301te\u0301 constate\u0301. Munis de ces deux crite\u0300res, les chercheurs ont identifie\u0301 des varie\u0301te\u0301s associe\u0301es a\u0300 un faible de\u0301gagement de me\u0301thane qu\u2019ils ont ensuite croise\u0301es avec d\u2019autres connues pour leur rendement e\u0301leve\u0301 en riz.<\/p>\n<p><b>Allier besoin croissant en riz et re\u0301duction des e\u0301missions de me\u0301thane<\/b><\/p>\n<p>Les hybrides se\u0301lectionne\u0301s ont garde\u0301 les deux proprie\u0301te\u0301s et leur exploitation en plein champ sur plusieurs anne\u0301es dans diffe\u0301rentes re\u0301gions de Chine a montre\u0301 qu\u2019ils les conservaient dans diverses conditions de culture. Cette de\u0301couverte prend toute son importance face a\u0300 l\u2019acce\u0301le\u0301ration re\u0301cente des e\u0301missions mondiales de me\u0301thane due au re\u0301chauffement terrestre qui stimule les activite\u0301s microbiennes et a\u0300 la sensible augmentation des besoins en riz ne\u0301cessaire pour nourrir la future population mondiale.<\/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 style=\"color: #ff6600\"><\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; C\u00f4te d&rsquo;Ivoire. La culture du riz est la deuxie\u0300me source de me\u0301thane de\u0301gage\u0301 par l\u2019agriculture apre\u0300s l\u2019e\u0301levage, mais ses e\u0301missions peuvent e\u0302tre re\u0301duites de 70%, montre une e\u0301quipe sue\u0301do-chinoise dans la revue Molecular Plant. Ce gaz a\u0300 effet de serre 80 fois plus puissant que le CO2 sur 20 ans dans l\u2019atmosphe\u0300re est [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":97521,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[37],"class_list":["post-97522","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-cote-divoire-2"],"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>Un riz qui \u00e9met peu de m\u00e9thane, c&#039;est possible - C\u00f4te d&#039;Ivoire<\/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.africa-press.net\/cotedivoire\/politique\/un-riz-qui-emet-peu-de-methane-cest-possible\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Un riz qui \u00e9met peu de m\u00e9thane, c&#039;est possible\" \/>\n<meta property=\"og:description\" content=\"Africa-Press &#8211; C\u00f4te d&rsquo;Ivoire. La culture du riz est la deuxie\u0300me source de me\u0301thane de\u0301gage\u0301 par l\u2019agriculture apre\u0300s l\u2019e\u0301levage, mais ses e\u0301missions peuvent e\u0302tre re\u0301duites de 70%, montre une e\u0301quipe sue\u0301do-chinoise dans la revue Molecular Plant. 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