Richard "Rick" Karban Posted on 06/19/2009 1:20:30 PM PDT by decimon
Richard "Rick" Karban
DAVIS—“To thine own self be true” may take on a new meaning—not with people or animal behavior but with plant behavior.
Plants engage in self-recognition and can communicate danger to their “clones” or genetically identical cuttings planted nearby, says professor Richard Karban of the Department of Entomology, University of California, Davis, in groundbreaking research published in the current edition of Ecology Letters.
Karban and fellow scientist Kaori Shiojiri of the Center for Ecological Research, Kyoto University, Japan, found that sagebrush responded to cues of self and non-self without physical contact.
The sagebrush communicated and cooperated with other branches of themselves to avoid being eaten by grasshoppers, Karban said. Although the research is in its early stages, the scientists suspect that the plants warn their own kind of impending danger by emitting volatile cues. This may involve secreting chemicals that deter herbivores or make the plant less profitable for herbivores to eat, he said.
What this research means is that plants are “capable of more sophisticated behavior than we imagined,” said Karban, who researches the interactions between herbivores (plant-eating organisms) and their host plants.
“Plants are capable of responding to complex cues that involve multiple stimuli,” Karban said. “Plants not only respond to reliable cues in their environments but also produce cues that communicate with other plants and with other organisms, such as pollinators, seed disperses, herbivores and enemies of those herbivores.”
In their UC Davis study, Karban and Shiojiri examined the relationships between the volatile profiles of clipped plants and herbivore damage They found that plants within 60 centimeters of an experimentally clipped neighbor in the field experienced less leaf damage over the season, compared with plants near an unclipped neighbor. Plants with root contact between neighbors, but not air contact, failed to show this response.
“We explored self-recognition in the context of plant resistance to herbivory ,” he said. “Previously we found that sagebrush (Artemisa tridentata) became more resistant to herbivores after exposure to volatile cues from experimentally damaged neighbors.”
The ecologists wrote that “naturally occurring herbivores caused similar responses as experimental clipping with scissors and active cues were released for up to three days following clipping. Choice and no-choice experiments indicated that herbivores responded to changes in plant characteristics and were not being repelled directly by airborne cues released by clipped individuals.”
In earlier research, Karban found that “volatile cues are required for communication among branches within an individual sagebrush plant. This observation suggests that communication between individuals may be a by-product of a volatile communication system that allows plants to integrate their own systemic physiological processes.”
The scientists made cuttings from 30 sagebrush plants at the UC Sagehen Creek Natural Reserve and then grew the cutting in plastic pots. They grew the cuttings at UC Davis and then placed the pots near the parent plant or near another different assay plant (control group) in the field.
The research, “Self-Recognition Affects Plant Communication and Defense,” is online. Their grant was funded by the U.S. Department of Agriculture Hatch Project and the Japan Society for the Promotion of Science (JSPS).
The sagebrush around my place must be on constant high alert...I bought my wife a trailer-pull 200-gallon propane tank for burning sagebrush. I thought I heard some strange screams when she torched off the burner.
We used to put these people in padded rooms. Now we call them “experts”.
“We used to put these people in padded rooms. Now we call them “experts”.”
They are experts, experts at living off one Federal grant after another, and also at producing drivel like the above.
The sad thing is there are nuts that believe them.
I remember this same stuff about plant feelings from back in the 1970’s.
Day of the Triffids!
We might, if they screamed all the time, for no good reason
I get email from a walnut.
Don't diss the Ents.
When you start getting email from an Acorn, hide.
No kidding. Only the Entwives can get away with that.
So we're talking about chemical cues here? Plants respond to all types of cues: chemical, tactile, and temperature cues. Why is this so AMAZING?!!!
Oh. Right. Someone needs a new grant.
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Uh, okay.Karban and fellow scientist Kaori Shiojiri of the Center for Ecological Research, Kyoto University, Japan, found that sagebrush responded to cues of self and non-self without physical contact.I've been suspicious about what my sagebrush plants are up to. Nice to see that I'm not just paranoid. |
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They hold a grudge.
At least the tumbleweeds are musical.
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