Present address: Centre for Research on Ecological Impacts of Coastal Cities, Marine Ecology Laboratories A11, The University of Sydney, NSW 2006, Australia.
An enzyme in snail saliva induces herbivore-resistance in a marine alga
Article first published online: 15 NOV 2006
Volume 21, Issue 1, pages 101–106, February 2007
How to Cite
COLEMAN, R. A., RAMCHUNDER, S. J., MOODY, A. J. and FOGGO, A. (2007), An enzyme in snail saliva induces herbivore-resistance in a marine alga. Functional Ecology, 21: 101–106. doi: 10.1111/j.1365-2435.2006.01210.x
- Issue published online: 15 NOV 2006
- Article first published online: 15 NOV 2006
- Received 30 June 2006; revised 27 August 2006; accepted 29 August 2006Editor: Frank Messina
- 1It is well understood that herbivory can cause plants to elevate production of defensive chemicals in their tissues. One of the key questions in understanding patterns of potential coevolutionary links between plant and herbivore is ‘what switches these induced plant defences on?’ Until cues are identified, understanding the evolutionary and ecological significance of defences in the context of the plant is difficult.
- 2We induced host plant resistance in a marine macroalga (Ascophyllum nodosum) in the absence of herbivory by application of α-amylase, known to exist in mollusc saliva. There was a demonstrable change in the behaviour of a subsequent herbivore (Littorina obtusata) consistent with herbivore induction, i.e. reduced consumption, more but smaller meals and greater movement. We also produced a concomitant increase in the level of phlorotannins, compounds associated with defence against herbivory.
- 3Such changes in herbivore behaviour and plant chemistry provide evidence that brown algae and higher plants utilize similar salivate-based signals in the induction of defence against herbivory. Thus the possibility that such responses could be either highly conserved or a convergent strategy is discussed.