{"id":121770,"date":"2021-07-31T08:40:46","date_gmt":"2021-07-31T15:40:46","guid":{"rendered":"https:\/\/www.pandasilk.com\/why-do-silkworms-produce-cocoons\/"},"modified":"2025-01-15T10:46:23","modified_gmt":"2025-01-15T18:46:23","slug":"why-do-silkworms-produce-cocoons","status":"publish","type":"post","link":"https:\/\/www.pandasilk.com\/cs\/why-do-silkworms-produce-cocoons\/","title":{"rendered":"Tajemstv\u00ed kokonu: Pro\u010d se bource moru\u0161ov\u00e9ho kukl\u00ed?"},"content":{"rendered":"

Hedv\u00e1bn\u00ed \u010dervi, mal\u00e9 a nen\u00e1padn\u00e9 larvy mot\u00fdla bource moru\u0161ov\u00e9ho (Bombyx mori), jsou zn\u00e1m\u00ed po cel\u00e9m sv\u011bt\u011b pro svou schopnost produkovat hedv\u00e1b\u00ed. Ale pro\u010d vlastn\u011b tito tvorov\u00e9 sp\u0159\u00e1daj\u00ed kokony? D\u016fvod je prost\u00fd, a z\u00e1rove\u0148 esenci\u00e1ln\u00ed pro jejich \u017eivotn\u00ed cyklus: ochrana a prom\u011bna. Kokon slou\u017e\u00ed jako bezpe\u010dn\u00fd \u00fakryt b\u011bhem zraniteln\u00e9ho obdob\u00ed metamorf\u00f3zy, kdy se larva p\u0159em\u011b\u0148uje v dosp\u011bl\u00e9ho mot\u00fdla.<\/p>\n

Ochrana p\u0159ed pred\u00e1tory<\/h3>\n
    \n
  1. Kokon poskytuje fyzickou bari\u00e9ru proti pred\u00e1tor\u016fm, jako jsou pt\u00e1ci, hmyz a pavouci. Hust\u00e1 struktura hedv\u00e1b\u00ed zt\u011b\u017euje p\u0159\u00edstup k bezbrann\u00e9 larv\u011b uvnit\u0159.<\/li>\n
  2. Maskov\u00e1n\u00ed: Barva kokonu \u010dasto spl\u00fdv\u00e1 s okol\u00edm, co\u017e sni\u017euje riziko, \u017ee ho pred\u00e1to\u0159i zpozoruj\u00ed.<\/li>\n<\/ol>\n

    Ochrana p\u0159ed nep\u0159\u00edzniv\u00fdmi podm\u00ednkami<\/h3>\n

    Kokon izoluje larvu od nep\u0159\u00edzniv\u00fdch vn\u011bj\u0161\u00edch vliv\u016f, jako jsou:<\/p>\n

      \n
    1. V\u00fdkyvy teplot: Hedv\u00e1b\u00ed pom\u00e1h\u00e1 udr\u017eovat stabiln\u00ed teplotu uvnit\u0159 kokonu, chr\u00e1n\u00ed larvu p\u0159ed chladem i p\u0159eh\u0159\u00e1t\u00edm.<\/li>\n
    2. Vlhkost: Kokon reguluje vlhkost a zabra\u0148uje vysych\u00e1n\u00ed larvy.<\/li>\n
    3. V\u00edtr a d\u00e9\u0161\u0165: Tlust\u00e1 vrstva hedv\u00e1b\u00ed chr\u00e1n\u00ed larvu p\u0159ed mechanick\u00fdm po\u0161kozen\u00edm zp\u016fsoben\u00fdm v\u011btrem, de\u0161t\u011bm a dal\u0161\u00edmi pov\u011btrnostn\u00edmi vlivy.<\/li>\n<\/ol>\n

      Umo\u017en\u011bn\u00ed metamorf\u00f3zy<\/h3>\n

      Uvnit\u0159 kokonu se odehr\u00e1v\u00e1 fascinuj\u00edc\u00ed proces prom\u011bny:<\/p>\n\n\n\n\n\n\n\n
      F\u00e1ze metamorf\u00f3zy<\/th>\nPopis<\/th>\n<\/tr>\n<\/thead>\n
      Larva<\/td>\nAktivn\u011b se \u017eiv\u00ed a rostou.<\/td>\n<\/tr>\n
      Kukla<\/td>\nLarva se uvnit\u0159 kokonu p\u0159em\u011bn\u00ed na kuklu, nehybn\u00fd stav, b\u011bhem kter\u00e9ho se reorganizuj\u00ed tk\u00e1n\u011b a org\u00e1ny.<\/td>\n<\/tr>\n
      Mot\u00fdl<\/td>\nZ kukly se vyl\u00edhne dosp\u011bl\u00fd mot\u00fdl, kter\u00fd opou\u0161t\u00ed kokon a je p\u0159ipraven k rozmno\u017eov\u00e1n\u00ed.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      Slo\u017een\u00ed a struktura kokonu<\/h3>\n

      Kokon se skl\u00e1d\u00e1 z jedin\u00e9ho, nep\u0159eru\u0161en\u00e9ho vl\u00e1kna hedv\u00e1b\u00ed, kter\u00e9 larva produkuje ve specializovan\u00fdch \u017el\u00e1z\u00e1ch. Toto vl\u00e1kno je tvo\u0159eno proteiny fibroinem a sericinem.<\/p>\n\n\n\n\n\n\n
      Slo\u017eka<\/th>\nFunkce<\/th>\n<\/tr>\n<\/thead>\n
      Fibroin<\/td>\nZaji\u0161\u0165uje pevnost a pru\u017enost hedv\u00e1bn\u00e9ho vl\u00e1kna.<\/td>\n<\/tr>\n
      Sericin<\/td>\nLepkav\u00e1 substance, kter\u00e1 dr\u017e\u00ed vl\u00e1kna pohromad\u011b a vytv\u00e1\u0159\u00ed kompaktn\u00ed strukturu kokonu.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      Produkce kokonu je pro bource moru\u0161ov\u00e9ho kl\u00ed\u010dov\u00e1 pro p\u0159e\u017eit\u00ed. Bez t\u00e9to ochrann\u00e9 schr\u00e1nky by larva byla vystavena pred\u00e1tor\u016fm a nep\u0159\u00edzniv\u00fdm podm\u00ednk\u00e1m, co\u017e by znemo\u017enilo dokon\u010den\u00ed metamorf\u00f3zy a vznik dosp\u011bl\u00e9ho mot\u00fdla. Kokon je d\u016fkazem fascinuj\u00edc\u00ed adaptace a d\u016fmyslnosti p\u0159\u00edrody, kter\u00e1 umo\u017e\u0148uje tomuto mal\u00e9mu hmyzu prosperovat.<\/p>\n","protected":false},"excerpt":{"rendered":"

      Hedv\u00e1bn\u00ed \u010dervi, mal\u00e9 a nen\u00e1padn\u00e9 larvy mot\u00fdla bource moru\u0161ov\u00e9ho (Bombyx mori), jsou zn\u00e1m\u00ed po cel\u00e9m sv\u011bt\u011b pro svou schopnost produkovat hedv\u00e1b\u00ed. Ale pro\u010d vlastn\u011b tito tvorov\u00e9 sp\u0159\u00e1daj\u00ed kokony? D\u016fvod je prost\u00fd, a z\u00e1rove\u0148 esenci\u00e1ln\u00ed pro jejich \u017eivotn\u00ed cyklus: ochrana a prom\u011bna. Kokon slou\u017e\u00ed jako bezpe\u010dn\u00fd \u00fakryt b\u011bhem zraniteln\u00e9ho obdob\u00ed metamorf\u00f3zy, kdy se larva p\u0159em\u011b\u0148uje v<\/p>\n","protected":false},"author":1,"featured_media":89672,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[37831],"tags":[],"class_list":["post-121770","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sericulture-cs","prodpage-classic"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.pandasilk.com\/cs\/wp-json\/wp\/v2\/posts\/121770","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.pandasilk.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.pandasilk.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.pandasilk.com\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.pandasilk.com\/cs\/wp-json\/wp\/v2\/comments?post=121770"}],"version-history":[{"count":0,"href":"https:\/\/www.pandasilk.com\/cs\/wp-json\/wp\/v2\/posts\/121770\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.pandasilk.com\/cs\/wp-json\/wp\/v2\/media\/89672"}],"wp:attachment":[{"href":"https:\/\/www.pandasilk.com\/cs\/wp-json\/wp\/v2\/media?parent=121770"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.pandasilk.com\/cs\/wp-json\/wp\/v2\/categories?post=121770"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.pandasilk.com\/cs\/wp-json\/wp\/v2\/tags?post=121770"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}