"We found some plants with all the leaves eaten," Cahill says. All the plants, they insist, were treated very kindly.
In an effort to fight off the human touch, the Indianhemp may have released chemicals that attracted the insects. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica.Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox.
Sometimes it is just a certain part of the plant that irritates, like the sap of Euphorbia or the roots of hyacinth. The other three species, Carolina Horsenettle (Solanum carolinense), Canada Thistle (Cirsium arvense), and Kentucky Bluegrass (Poa pratensis), did not seem to be affected one way or the other. The researchers have now turned their attention to finding out just what caused the plants to die, and they have broadened the scope to include many other species.
Learn more about stinging nettle, hogweed, the aptly named “pain bush”, and other plants you should think twice about touching. The study of subatomic particles, according to Heisenberg, is limited by the fact that just measuring the particles changes their properties.
The Sulphur Cinquefoil may have done just the opposite. But why wouldn't that have affected all six species? Unfortunately for humans, several of these chemical defenses can cause painful skin reactions. "The lightest touch from a human, animal, insect, or even plants touching each other in the wind, triggers a huge gene response in the plant," he said. Oddly enough, another plant, Sulphur Cinquefoil (Potentilla recta) seemed to enjoy the human contact. At the very least, the experiment proves one thing, Cahill says.
Cahill went on to the University of Delaware, but was haunted by the fact that so many plants had died while he was doing little more than measuring their growth.
So what gives here? “Within 30 minutes of being touched, 10 per cent of the plant’s genome is altered. The researchers studied six different plant species in 12 different plots in an old hayfield in Pennsylvania's Brandywine Valley.
Even handling house plants, he says, may have an effect, either good or bad. "It was quite troublesome," Cahill says, because he didn't think he had done anything to bring on their demise.
What they learned was quite shocking, Cahill says. Feb. 28, 2001 --
Oddly enough, another plant, Sulphur Cinquefoil (Potentilla recta) seemed to enjoy the human contact. Importantly, the study also identified two proteins that could switch off the plant's touch response. Melissa Petruzzello is Assistant Editor of Plant and Environmental Science and covers a range of content from plants, algae, and fungi, to renewable energy and environmental engineering. We tend to think of plants as only being dangerous if they’re poisonous, but there are some plants that are dangerous even to touch. The fact that the results were so mixed shows that the experiment itself was not so intrusive as to kill some of the plants, the researchers say.
So he teamed up with Casper, and Jeffrey Castelli, a graduate student, to see what they could learn. All it takes to kill some plants is the touch of the human hand, according to their research, published in the February issue of the journal Ecology.
That's not exactly the sort of thing a budding ecologist wants to see, so he took it up with his faculty advisor, Brenda Casper. “The lightest touch from a human, animal, insect, or even plants touching each other in the wind, triggers a huge gene response in the plant,” Professor Whelan said.
Instead, plants appear to have developed intricate stress defence systems to sense their environment and help them detect danger and respond appropriately," says Van Aken.
Although, for some extremely sensitive people, any part of a …
Plants such as agave or yucca have needle-sharp leaves, and getting too close can leave you with a cut or skin abrasion.
Turn on desktop notifications for breaking stories about interest? To study them is to change them.
They didn't want to do anything that would dramatically affect the plant, says Cahill, who has since moved on to the University of Alberta in Edmonton, where he is an assistant professor of biological science. Some plants like the Maiden-Hair fern dont like the oils from your fingers, they are very sensitive and the oil can hinder their growth. In other words, they were dead. If you live in eastern North America, you likely know to watch out for Tread-softly, also known as noseburn or finger-rot ( This is one of my favourite plants in …
Read on to discover some plants that could burn, blister, or otherwise irritate you! That wasn't always the case, but on average, he adds, the plants that had been handled showed severe damage. And some apparently just couldn't care less. "Unlike animals, plants are unable to run away from harmful conditions.
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