Researchers have recently discovered that trees have a “heartbeat,” it’s just so slow we’ve never noticed before .
Until now, scientists thought water moved through trees by osmosis, in a somewhat continuous manner.
Now they’ve discovered the trunks and branches of trees are actually contracting and expanding to “pump” water up from the roots to the leaves, similar to the way our heart pumps blood through our bodies.
The only difference between our pulse and a tree’s is a tree’s is much slower, “beating” once every two hours or so, and instead of regulating blood pressure, the heartbeat of a tree, regulates water pressure.
“We’ve discovered that most trees have regular periodic changes in shape, synchronized across the whole plant … which imply periodic changes in water pressure,” András Zlinszky of Aarhus University in the Netherlands told New Scientist.
In his 2017 study, Zlinszky and his colleague Anders Barfod used terrestrial laser scanning to monitor 22 tree species to see how the shape of their canopies changed.
The measurements were taken in greenhouses at night to rule out sun and wind as factors in the trees’ movements.
In several of the trees, branches moved up and down by about a centimeter or so every couple of hours.
After studying the nocturnal tree activity, the researchers came up with a theory about what the movement means. They believe the motion is an indication that trees are pumping water up from their roots. It is, in essence, a type of “heartbeat.”
Zlinszky and Barfod explain their theory in their newest study in the journal Plant Signaling and Behavior.
“In classical plant physiology, most transport processes are explained as constant flows with negligible fluctuation in time,” Zlinszky told New Scientist. “No fluctuations with periods shorter than 24 hours are assumed or explained by current models.”
But the researchers still don’t fully understand how the “pumping” motion works. They suggest maybe the trunk gently squeezes the water, pushing it upwards through the xylem, a system of tissue in the trunk whose main job is to transport water and nutrients from roots to shoots and leaves.
In 2016, Zlinszky and his team released another study demonstrating that birch trees “go to sleep” at night.
The researchers believe the dropping of birch branches before dawn is caused by a decrease in the tree’s internal water pressure. With no photosynthesis at night to drive the conversion of sunlight into simple sugars, trees likely conserve energy by relaxing branches that would otherwise be angled towards the sun.
These birch movements are circadian, following the day-night cycle.
Their new discovery is something entirely different, they say, because the movements happen at much shorter intervals.
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