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No such thing as a free lunch for Venus flytraps
Date:8/3/2010

open, but to the stimulation of the trigger hairs. The measurements are connected with electrical signals produced by trigger hair irritation. These signals are similar to the signals which spread through the animal neurons."

The results mean that the plants should not been seen as entirely passive. Pavlovič added: "These results show that the plant is as active as it appears and that it has adapted to trade-off the costs of lost photosynthesis against the benefits of additional nutrients from animal prey which in turn may later stimulate photosynthesis. This agrees with my earlier studies on carnivorous plants and shows why Venus Flytraps live in sunny habitats. The energy used in eating insects means that they need a lot of opportunity for photosynthesis, otherwise they lose more than they gain."

It also suggests an answer to a question posed by Darwin over a century ago. Pavlovič noticed that when the traps closed there were gaps between the 'teeth' at the edge of the trap that a small creature could escape through. He said: "This could be an adaptive trait. Victims with little useful nitrogen can escape, ensuring the plant doesn't waste energy digesting them. The Venus Flytrap is not a merciless killer."


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Contact: Alun Salt
annalsbotany@le.ac.uk
44-116-252-3396
Oxford University Press
Source:Eurekalert

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