FTER years of debating which way water rotates as it gurgles down the drain, scientists have a new problem to resolve.
Australian researchers have discovered that, contrary to expectation, almost all vines prefer to twist anti-clockwise as they climb.
Why is a mystery, Angela Moles, a University of NSW ecologist, said yesterday. Dr Moles uncovered the botanical bias while studying vines in nine countries, including Australia, Zambia, Mexico, Peru, Panama, Argentina, New Zealand and the Republic of Congo.
Her study sprouted from an email she received from one of her colleagues, Dr Will Edwards, a lecturer at James Cook University. During an excursion into a northern Queensland rainforest, an undergraduate student asked him why all the vines they could see were twisting in the same direction.
Unable to answer the question, Dr Edwards contacted Dr Moles, suggesting she take a look.
The researchers made three predictions. One was that plants would respond to the same “Coriolis effect” that, according to mythology, makes water turn one way as it goes down the plug hole in the southern hemisphere, and the opposite way in the northern hemisphere.
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Dr Moles began her vine study in Mexico, fully expecting to find that they would twist clockwise to follow the sun. To her surprise “100 per cent went anti-clockwise. That really blew our theories.”
Globally, she found, 92 per cent twisted anti-clockwise, irrespective of which hemisphere they were in.
Speculating about a reason, Dr Moles said all proteins were thought to be “left-handed”. That is, “they are not quite symmetrical”. Possibly, she said, “when you put them together to build up the cell skeleton, that may give cells a tendency to twist in a certain direction”.
That would mean vines were twisted in one direction not by global effects but by molecular-level biology. “But that is just a hypothesis. I’d love to hear other ideas.”
Dr Moles said the fact that scientists had never noticed the preference of vines to twist to the left showed how little was known about the botanical world.