V\u011bdci objevili nov\u00fd druh prav\u011bk\u00e9 kv\u011btiny zachovan\u00fd v jantaru v Dominik\u00e1nsk\u00e9 republice. Kv\u011bty s n\u00e1zvem Strychnos electri<\/em> pat\u0159\u00ed do skupiny hv\u011bzdnicovit\u00fdch, kter\u00e1 zahrnuje i modern\u00ed rostliny jako je k\u00e1va, brambory a slune\u010dnice. Tento objev poskytuje cenn\u00e9 poznatky o v\u00fdvoji hv\u011bzdnicovit\u00fdch a o ekologii d\u00e1vn\u00fdch ekosyst\u00e9m\u016f.<\/p>\n\n K\u0159ehk\u00e9 struktury kv\u011bt\u016f fosilizuj\u00ed jen z\u0159\u00eddka, ale jantar, fosilizovan\u00e1 prysky\u0159ice strom\u016f, je m\u016f\u017ee uchovat po miliony let. Lepkav\u00e1 prysky\u0159ice zachyt\u00ed a obal\u00ed vzorky a ochr\u00e1n\u00ed je p\u0159ed rozkladem. V p\u0159\u00edpad\u011b Strychnos electri<\/em> byly kv\u011bty uchov\u00e1ny v jantaru po des\u00edtky milion\u016f let.<\/p>\n\n Ur\u010dit st\u00e1\u0159\u00ed fosili\u00ed uzav\u0159en\u00fdch v jantaru m\u016f\u017ee b\u00fdt obt\u00ed\u017en\u00e9. Na rozd\u00edl od fosili\u00ed zachovan\u00fdch ve skal\u00e1ch, kter\u00e9 lze datovat pomoc\u00ed radiokarbonov\u00e9ho datov\u00e1n\u00ed, je jantar obt\u00ed\u017en\u011bj\u0161\u00ed datovat. V\u011bdci spol\u00e9haj\u00ed na jin\u00e9 metody, jako je anal\u00fdza evolu\u010dn\u00ed historie \u017eivotn\u00edch forem nalezen\u00fdch spole\u010dn\u011b s jantarov\u00fdmi vzorky.<\/p>\n\n V p\u0159\u00edpad\u011b Strychnos electri<\/em> v\u011bdci pou\u017eili foraminifery a kokolity, jednobun\u011b\u010dn\u00e9 organismy s v\u00fdrazn\u00fdmi evolu\u010dn\u00edmi cestami, k odhadu st\u00e1\u0159\u00ed fosili\u00ed. Testy v\u0161ak nep\u0159inesly jednozna\u010dn\u00e9 v\u00fdsledky, co\u017e nazna\u010duje, \u017ee kv\u011bty mohou b\u00fdt star\u00e9 kdekoli od 45 milion\u016f do 15 milion\u016f let.<\/p>\n\n P\u0159edpokl\u00e1d\u00e1 se, \u017ee Strychnos electri<\/em> je p\u0159\u00edbuzn\u00fd rodu Strychnos<\/em>, kter\u00fd zahrnuje rostliny zn\u00e1m\u00e9 sv\u00fdmi jedovat\u00fdmi vlastnostmi. Strychnin, smrteln\u00fd jed, se z\u00edsk\u00e1v\u00e1 z n\u011bkter\u00fdch druh\u016f Strychnos<\/em>. Je mo\u017en\u00e9, \u017ee Strychnos electri<\/em> tak\u00e9 obsahoval ur\u010dit\u00fd stupe\u0148 toxicity, co\u017e poskytovalo obrann\u00fd mechanismus proti b\u00fdlo\u017eravc\u016fm.<\/p>\n\n Objev Strychnos electri<\/em> vrh\u00e1 sv\u011btlo na ekologii d\u00e1vn\u00fdch ekosyst\u00e9m\u016f v Americe. P\u0159\u00edtomnost hv\u011bzdnicovit\u00fdch v z\u00e1znamu fosili\u00ed nazna\u010duje, \u017ee se tato skupina rostlin vyv\u00edjela ji\u017e p\u0159ed miliony let, d\u00e1vno p\u0159edt\u00edm, ne\u017e vznikl pevninsk\u00fd most mezi Severn\u00ed a Ji\u017en\u00ed Amerikou.<\/p>\n\n Hv\u011bzdnicovit\u00e9 hr\u00e1ly v\u00fdznamnou roli v lidsk\u00e9 spole\u010dnosti a poskytovaly n\u00e1m \u0161irokou \u0161k\u00e1lu potravin, n\u00e1poj\u016f a dal\u0161\u00edch produkt\u016f. K\u00e1va, brambory, papriky a slune\u010dnice jsou jen n\u011bkter\u00e9 p\u0159\u00edklady mnoha ekonomicky a kulturn\u011b d\u016fle\u017eit\u00fdch rostlin, kter\u00e9 pat\u0159\u00ed do t\u00e9to skupiny.<\/p>\n\n Objev Strychnos electri<\/em> n\u00e1m pom\u00e1h\u00e1 l\u00e9pe porozum\u011bt p\u016fvodu a v\u00fdvoji hv\u011bzdnicovit\u00fdch a prohlubuje na\u0161e uzn\u00e1n\u00ed rozmanitosti a vz\u00e1jemn\u00e9 prov\u00e1zanosti \u017eivota na Zemi.<\/p>","protected":false},"excerpt":{"rendered":" Nov\u00fd prav\u011bk\u00fd druh kv\u011btiny objeven\u00fd zakonzervovan\u00fd v jantaru Objev a v\u00fdznam V\u011bdci objevili nov\u00fd druh prav\u011bk\u00e9 kv\u011btiny zachovan\u00fd v jantaru v Dominik\u00e1nsk\u00e9 republice. Kv\u011bty s n\u00e1zvem Strychnos electri pat\u0159\u00ed do…<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[8469,136,239,5610,8470,8471,8472],"class_list":["post-4692","post","type-post","status-publish","format-standard","hentry","category-paleontology","tag-asterids","tag-evolution","tag-fossils","tag-amber","tag-paleobotany","tag-prehistoric-flowers","tag-strychnos"],"_links":{"self":[{"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/posts\/4692","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/comments?post=4692"}],"version-history":[{"count":1,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/posts\/4692\/revisions"}],"predecessor-version":[{"id":4693,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/posts\/4692\/revisions\/4693"}],"wp:attachment":[{"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/media?parent=4692"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/categories?post=4692"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/tags?post=4692"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Konzervace v jantaru<\/h2>\n\n
Datov\u00e1n\u00ed fosili\u00ed<\/h2>\n\n
Vztah k rodu Strychnos<\/h2>\n\n
Ekologick\u00e9 d\u016fsledky<\/h2>\n\n
P\u0159\u00ednosy pro lidskou spole\u010dnost<\/h2>\n\n