idw – Informationsdienst Wissenschaft
Nachrichten, Termine, Experten
Nachrichten, Termine, Experten
Geöffnete Venus Fliegenfalle (A): Deutlich erkennbar sind die sensorischen Haare, deren Natur in der Ausschnittvergrößerung (B) mittels Raster-Elektronen-Mikroskopie deutlich wird. Berühren potenzielle Beutetiere ein Haar, werden dessen Zellen an einer Soll-Knickstelle gequetscht. Es entsteht ein elektrisches Signal, das sich über die Fallenoberfläche ausbreitet. Folgt kurz darauf ein zweites Signal, klappt die Falle zu. Aus ihren rosettenartigen Drüsenkomplexen (in B erkennbar) setzt die Pflanze dann Verdauungssekret frei. Auf jedem Quadratmillimeter sitzen 60 Drüsen, das macht 37.000 pro Falle.
Bilder: Christian Wiese (A), Benjamin Hedrich (B)
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