{"id":203,"date":"2022-02-01T09:04:44","date_gmt":"2022-02-01T08:04:44","guid":{"rendered":"https:\/\/www.bretzel-liquide.com\/blog\/?p=203"},"modified":"2022-02-01T09:05:51","modified_gmt":"2022-02-01T08:05:51","slug":"le-matin-la-fleur-ouvre-ses-petales","status":"publish","type":"post","link":"https:\/\/www.bretzel-liquide.com\/blog\/2022\/02\/01\/le-matin-la-fleur-ouvre-ses-petales\/","title":{"rendered":"le matin, la fleur ouvre ses p\u00e9tales"},"content":{"rendered":"\n<figure class=\"wp-block-video\"><video height=\"480\" style=\"aspect-ratio: 640 \/ 480;\" width=\"640\" controls src=\"https:\/\/www.bretzel-liquide.com\/blog\/wp-content\/uploads\/2022\/02\/contorsionnisme-la-fleur-ouvre-ses-petales.mp4\"><\/video><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Pourquoi les fleurs se referment-elles quand le soleil se couche ?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>PAR E. CHARTIER<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"le-matin-la-fleur-ouvre-ses-petales-pourquoi-qui-ne-s-est-jamais-pose-la-question-meme-le-grand-charles-darwin-s-y-est-interesse-une-affaire-de-temperature-lumiere-et-horloge-interne\">le matin, la fleur ouvre ses p\u00e9tales. Pourquoi ? Qui ne s&rsquo;est jamais pos\u00e9 la question ?&nbsp;<a href=\"https:\/\/www.science-et-vie.com\/nature-et-enviro\/plantes-a-fleurs-l-abominable-mystere-de-darwin-s-eclaircit-60918\" target=\"_blank\" rel=\"noreferrer noopener\">M\u00eame le grand Charles Darwin s&rsquo;y est int\u00e9ress\u00e9<\/a>&#8230; Une affaire de temp\u00e9rature, lumi\u00e8re et horloge interne<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Chaque soir, les fleurs replient leurs p\u00e9tales pour ne les rouvrir qu&rsquo;au petit matin. Ce ph\u00e9nom\u00e8ne, appel\u00e9 nyctinastie, a fascin\u00e9 les plus grands savants, au premier rang desquels Charles Darwin, qui y a consacr\u00e9 l&rsquo;un de ses derniers ouvrages (<em>The Power of Movement in Plants<\/em>, 1880).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tout se joue dans des cellules motrices situ\u00e9es \u00e0 la base du p\u00e9tale. Sous l&rsquo;influence des variations de lumi\u00e8re, de temp\u00e9rature, mais aussi de l&rsquo;horloge interne, les cellules subissent des modifications de concentration, principalement en ions calcium et potassium.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ces changements entra\u00eenent une modification de la pression osmotique et de la turgescence des cellules : elles se gonflent d&rsquo;eau. Or, ces variations sont in\u00e9gales entre les faces sup\u00e9rieure et inf\u00e9rieure des p\u00e9tales ou des feuilles, ce qui induit la fermeture des corolles. Au matin, le processus inverse permet \u00e0 la fleur de s&rsquo;ouvrir \u00e0 nouveau.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>D&rsquo;apr\u00e8s Science &amp; Vie QR n\u00b025&nbsp;<a href=\"http:\/\/bit.ly\/SVQR25\" target=\"_blank\" rel=\"noreferrer noopener\">\u00ab Les plantes, leurs secrets &amp; leurs vertus \u00bb<\/a><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Pourquoi les fleurs se referment-elles quand le soleil se couche ? PAR E. CHARTIER le matin, la fleur ouvre ses p\u00e9tales. Pourquoi ? Qui ne s&rsquo;est jamais pos\u00e9 la question ?&nbsp;M\u00eame le grand Charles Darwin s&rsquo;y est int\u00e9ress\u00e9&#8230; Une affaire de temp\u00e9rature, lumi\u00e8re et horloge interne Chaque soir, les fleurs replient leurs p\u00e9tales pour ne [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"video","meta":{"footnotes":""},"categories":[24],"tags":[7,152,151,50,154,28,153,18],"class_list":["post-203","post","type-post","status-publish","format-video","hentry","category-laura-des-paquerettes","tag-comprendre-les-expressions-francaises","tag-contorsionniste","tag-fleur","tag-identite","tag-nature","tag-psychologie-en-partenariat-avec-spychologie-magasine","tag-science","tag-video","post_format-post-format-video"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>le matin, la fleur ouvre ses p\u00e9tales - \u00e0 l&#039;ombre d&#039;un paradoxe en fleur<\/title>\n<meta name=\"description\" content=\"le matin, la fleur ouvre ses p\u00e9tales. contorsionniste. 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