nature science update
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Hothouse flowers
The sacred lotus (Nelumbo nucifera)
features strongly in the mythology of
many ancient cultures and religions,
and it has now excited scientific
interest. A report in the 26 September
issue of Nature shows that the lotus
not only generates heat, but can
regulate its temperature in much the
same was as 'warm-blooded' birds and
mammals.
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The emergence from the mud of a beautiful white flower has been
taken by Buddhists as a symbol of life and rebirth. Not without cause
-- research by Dr Jane Shen-Miller at the University of California, Los
Angeles and colleagues, published in the American Journal of Botany,
showed how lotus seeds, preserved in the sediment of Chinese
monastery ponds for more than a thousand years, could still germinate.
The ancient Egyptians were also captivated by the flower, believing
that the sun God Re emerged from a sacred blue lotus that grew out of
the mud. And the lotus-eaters described by Homer in the Odyssey,
intoxicated by the fruit of the lotus, lost track of the passage of time.
Dr Roger Seymour and Dr Paul Schultze-Motel, botanists at the
University of Adelaide, Australia, are equally captivated by the sacred
lotus. Although lotuses, like some other plants, are known to generate
heat, the researchers were surprised to discover that the lotus could
maintain a constant temperature even as ambient air temperature fell.
The researchers speculate on why the lotus should go to the
considerable trouble of maintaining a constant 30 oC., It so happens
that this is precisely the temperature that insects such as bees and
beetles need to reach liefore they are warm enough to fly. These
insects are pollinators of the sacred lotus, so perhaps the flower keeps
these insects warm so that they can fly off, without extra effort, to
another lotus flower, taking the pollen with them.
©NATURE NEWS SERVICE 1996
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