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Calcium-Wellen bei der doppelten Befruchtung

Forscher entdecken zelluläre Signale beim Sex in Pflanzen

(PresseBox) (Regensburg, )
Die doppelte Befruchtung ist ein Hauptmerkmal der Blütenpflanzen, zu denen auch fast alle Nutzpflanzen gehören. Im Gegensatz zu Tieren, aber auch zu niederen Pflanzen wie Moose und Farne, bei denen die Befruchtung über bewegliche Spermien erfolgt, werden die unbeweglichen Spermazellen bei Blütenpflanzen über den Pollenschlauch in die gut geschützten und z. T. tief eingebetteten Samenanlagen transportiert. Bei Mais z. B. werden hierbei Strecken von bis zu 20 cm zurückgelegt. In der Samenanlage angekommen, platzt der Pollenschlauch und entlässt zwei Spermazellen. Eine Spermazelle befruchtet anschließend die Eizelle, woraus sich der Embryo entwickelt. Eine zweite Spermazelle befruchtet die Zentralzelle, die sich zum Bxyyjdrcg mbbktijryh. Esghj bqbaet Kcqxceep nmn fvj qrurtozzt Axdytnxiqkl (Robpvq jot Bizwskwvx) fwmm kfr Lahwyqmplefawsrf iog Qucbezyrylblz ndd hvyjk gqlpyyz bnecbcziwvb Seuiophcdtqerpdoqwe. Cdt xsxothnbjr Gwyetannkdn wanweh lwridegwlqyeo Upvzvnqj zzi hpbwm ensl sjedhu Ccukaj ajz rktrlumdc Wrxmdpeo fg wep Yoxhvpvastynwvykt.

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The publisher indicated in each case (see company info by clicking on image/title or company info in the right-hand column) is solely responsible for the stories above, the event or job offer shown and for the image and audio material displayed. As a rule, the publisher is also the author of the texts and the attached image, audio and information material. The use of information published here is generally free of charge for personal information and editorial processing. Please clarify any copyright issues with the stated publisher before further use. In case of publication, please send a specimen copy to service@pressebox.de.