{"id":10908,"date":"2023-03-29T16:41:00","date_gmt":"2023-03-29T16:41:00","guid":{"rendered":"https:\/\/www.africa-press.net\/djibouti\/politique\/reforestation-des-graines-qui-se-plantent-toutes-seules"},"modified":"2023-03-29T18:28:35","modified_gmt":"2023-03-29T18:28:35","slug":"reforestation-des-graines-qui-se-plantent-toutes-seules","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/djibouti\/toutes-les-actualites\/reforestation-des-graines-qui-se-plantent-toutes-seules","title":{"rendered":"Reforestation\u00a0: des graines qui se plantent toutes seules"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Djibouti. <\/strong><\/span>Une e\u0301quipe de la Carnegie Mellon University aux Etats-Unis s\u2019est inspire\u0301e de plantes a\u0300 graines dites auto-enfouissantes, capables de s\u2019enfoncer seules dans la terre, pour mettre au point un porte-graine de plantage. L&rsquo;objectif est d&rsquo;ame\u0301liorer la technique du semis ae\u0301rien qui consiste a\u0300 larguer des graines d&rsquo;un drone pour reve\u0301ge\u0301taliser des zones difficiles d&rsquo;acce\u0300s, restaurer des zones sauvages ou pour la reforestation apre\u0300s des incendies. Le proble\u0300me est que la technique souffre d&rsquo;un faible taux de germination en raison de l&rsquo;exposition directe des graines non enterre\u0301es a\u0300 la lumie\u0300re du soleil, aux vents violents et aux oiseaux granivores, ainsi qu&rsquo;a\u0300 l&rsquo;humidite\u0301 et a\u0300 la tempe\u0301rature de l&rsquo;air.<\/p>\n<p><b>Une force de torsion pour enfouir la graine<\/b><\/p>\n<p>Pour concevoir leur dispositif pre\u0301sente\u0301 dans la revue Nature, les chercheurs ont utilise\u0301 du bois de che\u0302ne blanc qui re\u0301agit aux changements d&rsquo;humidite\u0301 tout en restant suffisamment rigide pour enfoncer une graine dans le sol. Plus pre\u0301cise\u0301ment, ils se sont servis de la lignine, une biomole\u0301cule naturelle de la paroi cellulaire des plantes, pour cre\u0301er un reve\u0302tement de graine qui se dissout comple\u0300tement dans le sol apre\u0300s la germination. Le re\u0301sultat se pre\u0301sente sous la forme d&rsquo;une he\u0301lice qui, en re\u0301action a\u0300 l&rsquo;humidite\u0301, va se mettre a\u0300 tourner en exerc\u0327ant une force de torsion pour enfouir la graine.<\/p>\n<p><b>La graine est prote\u0301ge\u0301e des intempe\u0301ries et des ravageurs<\/b><\/p>\n<p>Le dispositif permet ainsi a\u0300 la graine de se prote\u0301ger des intempe\u0301ries et des ravageurs, tout en apportant des nutriments supple\u0301mentaires a\u0300 la jeune plante. Teste\u0301 avec des graines de moutardes dans des conditions arides, le dispositif a ainsi permis l\u2019ancrage au sol de 66% a\u0300 80% d\u2019entre elles largue\u0301es par drone. Perfectible, certes, mais de\u0301ja\u0300 tre\u0300s supe\u0301rieur aux attentes des chercheurs qui se fondaient sur le faible taux de germination des graines auto-enfouissantes d&rsquo;Erodium. \u00ab\u00a0C&rsquo;est un exemple parfait de la beaute\u0301 et de la puissance du design bio-inspire\u0301, s&rsquo;enthousiasme le Pr Teng Zhang a\u0300 la publication de ces travaux. Nous apprenons de la nature et obtenons finalement des performances supe\u0301rieures en tirant parti de la liberte\u0301 de conception technique.\u00a0\u00bb<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <a href=\"https:\/\/www.africa-press.net\/djibouti\">Djibouti<\/a>, suivez <a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Djibouti. Une e\u0301quipe de la Carnegie Mellon University aux Etats-Unis s\u2019est inspire\u0301e de plantes a\u0300 graines dites auto-enfouissantes, capables de s\u2019enfoncer seules dans la terre, pour mettre au point un porte-graine de plantage. L&rsquo;objectif est d&rsquo;ame\u0301liorer la technique du semis ae\u0301rien qui consiste a\u0300 larguer des graines d&rsquo;un drone pour reve\u0301ge\u0301taliser des zones [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":10907,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[36,49,50],"class_list":["post-10908","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-djibouti","tag-djibouti"],"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>Reforestation\u00a0: des graines qui se plantent toutes seules - Djibouti<\/title>\n<meta name=\"description\" content=\"Une e\u0301quipe de la Carnegie Mellon University aux Etats-Unis s\u2019est inspire\u0301e de plantes a\u0300 graines dites auto-enfouissant ...\" \/>\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\/djibouti\/toutes-les-actualites\/reforestation-des-graines-qui-se-plantent-toutes-seules\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Reforestation\u00a0: des graines qui se plantent toutes seules\" \/>\n<meta property=\"og:description\" content=\"Une e\u0301quipe de la Carnegie Mellon University aux Etats-Unis s\u2019est inspire\u0301e de plantes a\u0300 graines dites auto-enfouissant ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/djibouti\/toutes-les-actualites\/reforestation-des-graines-qui-se-plantent-toutes-seules\" \/>\n<meta property=\"og:site_name\" content=\"Djibouti\" \/>\n<meta property=\"article:published_time\" content=\"2023-03-29T16:41:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-03-29T18:28:35+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/djibouti\/sites\/52\/2023\/03\/postQueueImg_1680092015.63.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"900\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"cfeditorfr\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"cfeditorfr\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.africa-press.net\/djibouti\/toutes-les-actualites\/reforestation-des-graines-qui-se-plantent-toutes-seules#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/djibouti\/toutes-les-actualites\/reforestation-des-graines-qui-se-plantent-toutes-seules\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/djibouti\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"Reforestation\u00a0: des graines qui se plantent toutes seules\",\"datePublished\":\"2023-03-29T16:41:00+00:00\",\"dateModified\":\"2023-03-29T18:28:35+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/djibouti\/toutes-les-actualites\/reforestation-des-graines-qui-se-plantent-toutes-seules\"},\"wordCount\":420,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/djibouti\/toutes-les-actualites\/reforestation-des-graines-qui-se-plantent-toutes-seules#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/djibouti\/sites\/52\/2023\/03\/postQueueImg_1680092015.63.jpg\",\"keywords\":[\"Africa Press\",\"Africa Press-Djibouti\",\"Djibouti\"],\"articleSection\":[\"Divers\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/djibouti\/toutes-les-actualites\/reforestation-des-graines-qui-se-plantent-toutes-seules#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/djibouti\/toutes-les-actualites\/reforestation-des-graines-qui-se-plantent-toutes-seules\",\"url\":\"https:\/\/www.africa-press.net\/djibouti\/toutes-les-actualites\/reforestation-des-graines-qui-se-plantent-toutes-seules\",\"name\":\"Reforestation\u00a0: des graines qui se plantent toutes seules - 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