Bio-calendrier - L'année dans la vie des plantes et des animaux

DSpace Repository


Dokumentart: Book
Date: 2009
Language: French
Faculty: 7 Mathematisch-Naturwissenschaftliche Fakultät
Department: Biologie
DDC Classifikation: 570 - Life sciences; biology
Keywords: Jahresuhr , Photoperiodismus , Keimung , Blühinduktion
Other Keywords: Tagesuhr
Annual clock , Daily clock , Photoperiodism , Germination , Flower induction
Other Contributors: Dieumegard, Pierre
Show full item record


Many organisms use an internal calendar. It allows to recognize the season. This calendar is based either on an internal annual clock or on an internal daily clock. Annual clocks control, for instance, the eclosion of dinoflagellates out of the cyst and the germination of seeds, body weight, fur color, reproduction and behavior of the Dsungarian hamster, molt and migration of birds. Photoperiodic reactions measure the day length and induce beyond a critical length (longday organisms) or below a critical length (shortday organisms) certain processes. In this way flowers are induced in shortday plants such as Kalanchoe blossfeldiana and Pharbitis nil or in longday plants such as Arabidopsis thaliana. Potato tubers are formed under shortday conditions, bulbs under longday conditions. Some proposals for experimenting are made.

This item appears in the following Collection(s)

cc_by-nc-nd Except where otherwise noted, this item's license is described as cc_by-nc-nd