Jasmonates trigger prey-induced formation of 'outer stomach' in carnivorous sundew plants

Autor(en)
Yoko Nakamura, Michael Reichelt, Veronika Mayer, Axel Mithoefer
Abstrakt

It has been widely accepted that the growth-related phytohormone auxin is the endogenous signal that initiates bending movements of plant organs. In 1875, Charles Darwin described how the bending movement of leaves in carnivorous sundew species formed an 'outer stomach' that allowed the plants to enclose and digest captured insect prey. About 100 years later, auxin was suggested to be the factor responsible for this movement. We report that prey capture induces both leaf bending and the accumulation of defence-related jasmonate phytohormones. In Drosera capensis fed with fruitflies, within 3 h after prey capture and simultaneous with leaf movement, we detected an increase in jasmonic acid and its isoleucine conjugate. This accumulation was spatially restricted to the bending segment of the leaves. The application of jasmonates alone was sufficient to trigger leaf bending. Only living fruitflies or the body fluids of crushed fruitflies induced leaf curvature; neither dead flies nor mechanical treatment had any effect. Our findings strongly suggest that the formation of the 'outer stomach' in Drosera is a chemonastic movement that is triggered by accumulation of endogenous jasmonates. These results suggest that in carnivorous sundew plants the jasmonate cascade might have been adapted to facilitate carnivory rather than to defend against herbivores.

Organisation(en)
Institut für Ostasienwissenschaften
Externe Organisation(en)
Max-Planck-Institut für chemische Ökologie
Journal
Proceedings of the Royal Society of London B: Biological Sciences
Band
280
Anzahl der Seiten
6
ISSN
0962-8452
DOI
https://doi.org/10.1098/rspb.2013.0228
Publikationsdatum
05-2013
Peer-reviewed
Ja
ÖFOS 2012
106008 Botanik
Schlagwörter
Link zum Portal
https://ucris.univie.ac.at/portal/de/publications/jasmonates-trigger-preyinduced-formation-of-outer-stomach-in-carnivorous-sundew-plants(e289ba4b-43d4-43f9-9d61-691062045a10).html