Archegonium
Archegonium(aGraecisἀρχή'initium' +γόνος'proles') est structura velorganummulticellularetemporisgametophytorumin quibusdamplantis,quodovum(gametamfemininum) gignit et continet. Homologum organummasestantheridium.Archegonio sunt longus venter (canalis cervicalis) et basis tumida. Archegonia plerumque insuperficiethallifiunt, sed inanthocerotophytisintratextuminveniuntur.
In bryophytis
[recensere|fontem recensere]Inbryophytisaliisquecryptogamis,semenad archegoniumnatationeinliquidopervenit, quandoquidem inpinophytisetangiospermispollenventovelvectoribusanimalibus,et semina pertubum pollinistraduntur. Exempli gratia, inPhyscomitrella patente,archegonia non intra textum, sed supergametophoramfoliaceampatent.[2]
In gymnospermis
[recensere|fontem recensere]Archegonia in megagametophytisgymnospermarummulto imminuuntur.VocabulumadangiospermasetgnetophytaGnetumetWelwitschiamnon adhibetur quia megagametophyta ex perpaucis cellulis constant, quarum sese in cellulamovalemuna mutant.Diploidicaemegasporangii(nucelli) cellulae gametam intraovulumplerumque cingunt. Archegonium gymnospermarum postpollinationemintrastrobilos(femineosconiferorum conos) formantur.[3]
Nexus interni
Notae
[recensere|fontem recensere]- ↑Mosquna et al. 2009.
- ↑Mosquna et al. 2009.
- ↑Brooklyn Botanic Garden.
Bibliographia
[recensere|fontem recensere]- Mosquna, Assaf, Aviva Katz, Eva L. Decker, Stefan A. Rensing, Ralf Reski, et Nir Ohad.2009.Regulation of stem cell maintenance by the Polycomb protein FIE has been conserved during land plant evolution.Development136:2433-2444.Textus.
- Wagenitz, Gerhard.2003.Archegonium. InWörterbuch der Botanik: Die Termini in ihrem historischen Zusammenhang.Ed. 2a. Heidelbergae et Berolini: Spektrum Akademischer Verlag.ISBN 3827413982.