{"id":7672,"date":"2020-10-19T09:32:05","date_gmt":"2020-10-19T09:32:05","guid":{"rendered":"https:\/\/orca.rs\/?p=7672"},"modified":"2021-03-21T11:48:51","modified_gmt":"2021-03-21T11:48:51","slug":"lisce-jesen","status":"publish","type":"post","link":"https:\/\/orca.rs\/en\/lisce-jesen\/","title":{"rendered":"Za\u0161to li\u0161\u0107e menja boju tokom jeseni?"},"content":{"rendered":"<div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-1 nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"background-color: rgba(255,255,255,0);background-position: center center;background-repeat: no-repeat;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;margin-bottom: 0px;margin-top: 0px;border-width: 0px 0px 0px 0px;border-color:#eae9e9;border-style:solid;\" ><div class=\"fusion-builder-row fusion-row\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-0 fusion_builder_column_1_1 1_1 fusion-one-full fusion-column-first fusion-column-last\" style=\"margin-top:0px;margin-bottom:20px;\"><div class=\"fusion-column-wrapper fusion-flex-column-wrapper-legacy\" style=\"background-position:left top;background-repeat:no-repeat;-webkit-background-size:cover;-moz-background-size:cover;-o-background-size:cover;background-size:cover;padding: 0px 0px 0px 0px;\"><div class=\"fusion-text fusion-text-1\"><p style=\"text-align: justify;\"><strong><span style=\"color: #ff6600;\">Koji prirodni mehanizmi svake godine proizvode prelepe boje li\u0161\u0107a?<\/span><\/strong><\/p>\n<p style=\"text-align: justify;\">Albert Kami je jednom rekao: \u201cJesen je drugo prole\u0107e kada je svaki list cvet.\u201d Lako je slo\u017eiti se sa takvim mi\u0161ljenjem ako ste ikada i\u0161li u jesenju, impresivnu\u00a0 \u0161etnju ili vo\u017enju, ali koja je nauka iza tih jesenjih boja koje oduzimaju dah?<\/p>\n<p style=\"text-align: justify;\">Postoji nekoliko <strong>razloga zbog kojih li\u0161\u0107e menja boju u jesen<\/strong>, ali najzna\u010dajniji faktori koji doprinose tome su kra\u0107i dan i du\u017ea no\u0107. Ti faktori uti\u010du na hemijski proces unutar svakog lista.<\/p>\n<p style=\"text-align: justify;\">Sve se svodi na biolo\u0161ke pigmente (tako\u0111e poznate i kao \u201ebiohromi\u201c), koji su molekularne supstance, koje se u \u017eivim bi\u0107ima manifestuju kao specifi\u010dne boje, upijaju\u0107i ili reflektuju\u0107i talasne du\u017eine svetlosti.<\/p>\n<p style=\"text-align: justify;\">Mo\u017eda ve\u0107 znate pone\u0161to o hlorofilu \u2014 to je zeleni pigment koji biljke proizvode tokom procesa fotosinteze. Neki od ostalih pigmenata koji se nalaze u biljkama su karotenoidi, koji su odgovorni za narand\u017easte, i antocijani, koji daju crvene i ljubi\u010daste listove. Dok su hlorofil i karotenoidi prisutni tokom cele vegetacije, ve\u0107ina antocijanina proizvodi se isklju\u010divo krajem leta i po\u010detkom jeseni.<\/p>\n<p style=\"text-align: justify;\">Kako dani postaju kra\u0107i, a no\u0107i sve du\u017ee, koli\u010dina svetlosti potrebna za fotosintezu opada, a proizvodnja hlorofila postepeno prestaje. Bez stvaranja novog hlorofila, karakteristi\u010dna zelena boja li\u0161\u0107a po\u010dinje da se raspada i nestaje. Ovaj mehanizam u su\u0161tini &#8220;razotkriva&#8221; boje karotenoida i antocijanina koji su vrebali ispod.<\/p>\n<p style=\"text-align: justify;\">Iako je <strong>smanjivanje sati sun\u010deve svetlosti najzna\u010dajniji faktor<\/strong> koji uti\u010de na promenu boje li\u0161\u0107a, temperatura i vla\u017enost tako\u0111e mogu igrati ulogu u intenzitetu ovih sezonskih prikaza. Na primer, topli, sun\u010dani dani u kombinaciji sa hladnim, blagim no\u0107ima posebno su mo\u0107an recept za rasko\u0161.<\/p>\n<p style=\"text-align: justify;\">Tokom ovih dana u listu se stvara puno \u0161e\u0107era, ali hladne no\u0107i i postepeno zatvaranje \u017eila koje ulaze u list spre\u010davaju odliv tih \u0161e\u0107era.\u00a0 Ovi uslovi \u2014 puno \u0161e\u0107era i puno svetlosti \u2014 podstakne proizvodnju briljantnih antocijaninskih pigmenata koji nijansiraju crveno, ljubi\u010dasto i grimizno.<\/p>\n<p style=\"text-align: justify;\">Nadmorska visina i vrsta drveta su jo\u0161 dva faktora koji uti\u010du na vreme opadanja li\u0161\u0107a. Drve\u0107e na vi\u0161im planinskim uzvi\u0161enjima verovatno \u0107e promeniti boju br\u017ee od svojih dolinskih parnjaka na istoj geografskoj \u0161irini.<\/p>\n<p>Prevela: Jelena Jovanovi\u0107<\/p>\n<\/div><div class=\"fusion-clearfix\"><\/div><\/div><\/div><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":3,"featured_media":7875,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[42],"tags":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Za\u0161to li\u0161\u0107e menja boju tokom jeseni? - ORCA - Priroda<\/title>\n<meta name=\"description\" content=\"Postoji nekoliko razloga zbog kojih li\u0161\u0107e menja boju u jesen, ali najzna\u010dajniji faktori su kra\u0107i dan i du\u017ea no\u0107. 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