📄 Extracted Text (664 words)
From: Robert Kuhn
To: "jeffrey E." <[email protected]>
Subject: Re:
Date: Thu, 18 May 2017 00:43:27 +0000
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I'm in NY June 7-14+. Plants and Silk Road below
BIOLOGY
Can Plants Hear?
Flora may be able to detect the sounds of flowing water or munching
insects
By Marta Zaraska on May 17, 2017
EFTA01045847
Credit: nikkytok Getty Images
Pseudoscientific claims that music helps plants grow have been made for
decades, despite evidence that is shaky at best. Yet new research suggests
some flora may be capable of sensing sounds, such as the gurgle of water
through a pipe or the buzzing of insects.
In a recent study, Monica Gagliano, an evolutionary biologist at the
University of Western Australia, and her colleagues placed pea seedlings in
pots shaped like an upside-down Y. One arm of each pot was placed in either
a tray of water or a coiled plastic tube through which water flowed; the other
arm had only soil. The roots grew toward the arm of the pipe with the fluid,
regardless of whether it was easily accessible or hidden inside the tubing.
"They just knew the water was there, even if the only thing to detect was the
sound of it flowing inside the pipe," Gagliano says. Yet when the seedlings
were given a choice between the water tube and some moistened soil, their
roots favored the latter.Gagliano hypothesizes that these plants use sound
waves to detect water at a distance but follow moisture gradients to home in
on their target when it is closer.
The research, reported earlier this year in Oecologia, is not the first to suggest
flora can detect and interpret such information. A 2014 study showed the rock
cress Arabidopsis, a relative of cabbage, can distinguish between caterpillar
chewing sounds and wind vibrations—the plant produced more chemical
toxins after "hearing" a recording of feeding insects. "We tend to
underestimate plants because their responses are usually less visible to us.
But leaves turn out to be extremely sensitive vibration detectors," says lead
study author Heidi Appel, an environmental scientist now at the University of
Toledo.
Another hint that plants can hear comes from the phenomenon of "buzz
pollination," in which a bee buzzing at a particular frequency has been shown
to stimulate pollen release. Other experiments have found that sounds can
lead to hormonal changes in plants, influence their oxygen uptake and change
their growth rates. A study published earlier this year revealed that sound
waves can even influence gene expression in Arabidopsis.
EFTA01045848
Michael Schtiner, a biologist at University of Greifswald in Germany, who was
not involved in the new research, believes that plants may have organs that
can perceive noises. "Sound vibrations could trigger a response of the plant
via mechanoreceptors—these could be very fine, hairy structures, anything
that could work like a membrane," he says.
This research raises questions about whether acoustic pollution affects plants
as well as animals, Gagliano observes: "Noise could block information
channels between plants, for example, when they need to warn each other of
insects." So next time you turn on a noisy leaf blower or a hedge trimmer in
your garden, consider the lilies.
https://www.sc ienti ficamerican.com/art icle/can-plants-hearnWT.mc_id=SA_DD_201 7051 7
On May 13, 2017, at 6:58 PM, jeffrey E. <jeevacation@grrtn> wrote:
great idea, yes the silk road is not getting any attention in the states. wild.
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