\u00d6nemli bir \u00e7al\u0131\u015fma, g\u00fcnl\u00fck saatle mevsimsel zamanlama aras\u0131nda genetik bir ba\u011flant\u0131 oldu\u011funu g\u00f6sterdi. Leicester \u00dcniversitesi\u2019nde yap\u0131lan ara\u015ft\u0131rmada iki \u00f6nemli zamansal mekanizma aras\u0131nda genetik bir ba\u011flant\u0131 olabilece\u011fi ilk kez deneysel olarak g\u00f6sterildi.<\/p>\n
Leicester \u00dcniversitesi Tauber Laboratuvar\u0131, ara\u015ft\u0131rmay\u0131 4 Eyl\u00fcl\u2019de akademik bir dergi olan\u00a0Plos Genetics<\/i>\u2019de yay\u0131mlad\u0131. Bu \u00e7al\u0131\u015fma, daha \u00f6nce de g\u00f6zlemlenmi\u015f olan \u0131\u015f\u0131\u011f\u0131n \u00e7abuk kayboldu\u011fu k\u0131sa bir g\u00fcnde ya\u015famlar\u0131n\u0131 s\u00fcrd\u00fcren meyve sineklerinin, \u0131\u015f\u0131\u011f\u0131 bol uzun bir g\u00fcnde ya\u015fayanlardan daha fazla so\u011fu\u011fa dayan\u0131kl\u0131 yap\u0131da olduklar\u0131n\u0131 destekliyordu. Bu sonu\u00e7 son zamanlardaki mevsimsel \u0131\u015f\u0131k d\u00f6ng\u00fcs\u00fc (fotoperiyodizm) \u00e7al\u0131\u015fmalar\u0131nda da kullan\u0131labilecek gibi duruyor.<\/p>\n
I\u015f\u0131k d\u00f6ng\u00fcs\u00fc, hem hayvanlar\u0131n hem de bitkilerin g\u00fcn ya da gecenin s\u00fcresine verdikleri fizyolojik bir tepkidir. Ara\u015ft\u0131rma ekibinin \u00fcyelerinden Dr. Mirko Pegoraro\u2019ya g\u00f6re, uzun ve k\u0131sa g\u00fcn aras\u0131ndaki fark\u0131 ve neleri de\u011fi\u015ftirdi\u011fini anlayabilmek ve y\u00f6netmek, mevsimsel zamanlama, yani y\u0131l boyunca \u0131\u015f\u0131k d\u00f6ng\u00fcs\u00fc de\u011fi\u015fimlerinin d\u00fczenli ve tahmin edilebilir \u015fekilde olmas\u0131yla ilgilidir.<\/p>\n
So\u011fuk yan\u0131t\u0131n\u0131n farkl\u0131l\u0131\u011f\u0131, so\u011fuk komas\u0131na geri d\u00f6n\u00fc\u015fl\u00fc \u015fekilde sokulan meyve sineklerinde izlenmi\u015ftir. Komadan geri d\u00f6n\u00fc\u015f s\u00fcresi, meyve sineklerinin so\u011fu\u011fa nas\u0131l adapte olduklar\u0131n\u0131 da g\u00f6stermi\u015ftir. Ekip bu belirlemeyi, \u0131\u015f\u0131k d\u00f6ng\u00fcs\u00fcn\u00fc geni\u015f \u015fekilde d\u00fczenleyerek ve kontrol ederek yapt\u0131. \u00d6rne\u011fin k\u0131\u015f aylar\u0131nda oldu\u011fu gibi k\u0131sa bir \u0131\u015f\u0131\u011fa maruz kalan sinekler daha k\u0131sa s\u00fcrede komadan \u00e7\u0131kt\u0131lar (daha fazla so\u011fuk adaptasyonu).<\/p>\n
Leicester \u00dcniversitesi Genetik B\u00f6l\u00fcm\u00fc\u2019nden Dr. Eran Tauber\u2019e g\u00f6re, mevsimsel zamanlama pek \u00e7ok organizma i\u00e7in, \u00f6zellikle de her mevsimin g\u00f6r\u00fcld\u00fc\u011f\u00fc iklimlerde ya\u015fayanlarda, ya\u015famsal \u00f6nemdedir.<\/p>\n
\u00c7al\u0131\u015fmada, memelilerden bitkilere uzanan geni\u015f bir t\u00fcr aral\u0131\u011f\u0131 \u201c\u0131\u015f\u0131k d\u00f6ng\u00fcs\u00fc saati\u201d ile izlenerek y\u0131l i\u00e7inde g\u00fcn \u0131\u015f\u0131\u011f\u0131na ve s\u00fcresine verdikleri tepkiler g\u00f6zlemlendi. Pek \u00e7ok b\u00f6cek, \u00f6rne\u011fin dikkate de\u011fer t\u00fcrde tar\u0131msal b\u00f6cek, g\u00fcnlerin k\u0131sald\u0131\u011f\u0131 sonbahar d\u00f6neminde adeta k\u0131\u015f uykusuna yatar \u015fekilde biyolojik geli\u015fimlerini yava\u015flatarak, k\u0131\u015f\u0131n ya\u015famlar\u0131n\u0131 s\u00fcrd\u00fcrebilir hale geliyorlard\u0131.<\/p>\n
Son 80 y\u0131ld\u0131r \u0131\u015f\u0131k d\u00f6ng\u00fcs\u00fc saati ile yap\u0131lan yo\u011fun \u00e7al\u0131\u015fmalara ra\u011fmen, halen altta yatan molek\u00fcler mekanizma tam olarak anla\u015f\u0131lamam\u0131\u015ft\u0131r. Bu da d\u00f6ng\u00fcsel saatle g\u00fcnl\u00fck ritm aras\u0131ndaki ili\u015fkiyi anlamay\u0131 zorla\u015ft\u0131rmaktad\u0131r. Ekip ayr\u0131ca sineklerde d\u00f6ng\u00fcsel saati aksatan mutasyonsal sujlar\u0131 test etmi\u015f ve fotoperiyodik saat de aksamalar meydana geldi\u011fini bulmu\u015ftur. Bu \u00e7al\u0131\u015fmayla, sineklerde, mevsimsel fotoperiyodik zamanlamada d\u00f6ng\u00fcsel saatin rol\u00fc i\u00e7in ilk deneysel kan\u0131t\u0131 sa\u011flam\u0131\u015ft\u0131r.<\/p>\n","protected":false},"excerpt":{"rendered":"
\u00d6nemli bir \u00e7al\u0131\u015fma, g\u00fcnl\u00fck saatle mevsimsel zamanlama aras\u0131nda genetik bir ba\u011flant\u0131 oldu\u011funu g\u00f6sterdi. Leicester \u00dcniversitesi\u2019nde yap\u0131lan ara\u015ft\u0131rmada iki \u00f6nemli zamansal mekanizma aras\u0131nda genetik bir ba\u011flant\u0131 olabilece\u011fi ilk kez deneysel olarak g\u00f6sterildi. Leicester \u00dcniversitesi Tauber Laboratuvar\u0131, ara\u015ft\u0131rmay\u0131 4 Eyl\u00fcl\u2019de akademik bir dergi olan\u00a0Plos Genetics\u2019de yay\u0131mlad\u0131. Bu \u00e7al\u0131\u015fma, daha \u00f6nce de g\u00f6zlemlenmi\u015f olan \u0131\u015f\u0131\u011f\u0131n \u00e7abuk kayboldu\u011fu k\u0131sa […]<\/p>\n","protected":false},"author":42,"featured_media":13272,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[165,19,21],"tags":[776,1191,1083],"class_list":["post-129","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-128-sayi","category-bilim-gundemi","category-biyoloji","tag-hayvanlar","tag-mevsim","tag-zaman"],"acf":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/posts\/129","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/users\/42"}],"replies":[{"embeddable":true,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/comments?post=129"}],"version-history":[{"count":0,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/posts\/129\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/media\/13272"}],"wp:attachment":[{"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/media?parent=129"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/categories?post=129"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/tags?post=129"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}