By
using the same experimental framework normally applied to test learnt
behavioral responses in animals, biologists from Australia and Italy
have successfully demonstrated that Mimosa pudica – an exotic
herb native to South America and Central America – can learn and
remember just as well as it would be expected of animals.
Mimosa pudica at the Botanical Garden KIT, Karlsruhe, Germany. Image credit: H. Zell / CC BY-SA 3.0.
Mimosa pudica
is known as the Sensitive plant or a touch-me-not. Dr Monica Gagliano
from the University of Western Australia and her colleagues designed
their experiments as if
Mimosa was indeed an animal.
They trained
Mimosa‘s
short- and long-term memories under both high and low-light
environments by repeatedly dropping water on them using a
custom-designed apparatus.
The scientists show how
Mimosa plants stopped closing their leaves when they learnt that the repeated disturbance had no real damaging consequence.
The
plants were able to acquire the learnt behavior in a matter of seconds
and as in animals, learning was faster in less favorable environment.
Most
remarkably, these plants were able to remember what had been learned
for several weeks, even after environmental conditions had changed.
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