A bit touchy: Plants' insect defenses activated by touch

(Press-News.org) HOUSTON -- (April 9, 2012) -- A new study by Rice University scientists reveals that plants can use the sense of touch to fight off fungal infections and insects. The study, which will be published in the April 24 issue of Current Biology, finds that plant defenses are enhanced when plants are touched.

"From previous studies, we knew that plants change their growth in response to touch but we didn't know how these growth changes were activated," said Wassim Chehab, a faculty fellow in Rice's Department of Biochemistry and Cell Biology and lead author of the new study. "We used a widely studied plant, Arabidopsis thaliana, to test the idea that the touch-induced growth was regulated by a plant hormone called jasmonate."

Jasmonate plays a critical role in initiating plant defenses against plant-eating insects. When jasmonate levels go up, the plant increases production of metabolites that give herbivores an upset stomach. Jasmonate defenses, which also protect against some fungal infections, are employed by virtually all plants, including tomatoes, rice and corn. The new study provides the first evidence that these defenses are triggered when plants are touched. In the study, students touched the plants in a laboratory, but the researchers say the touch-induced response could also be activated by animals, including insects, and wind.

"Plants can't move, so it makes sense for them to have a highly developed sense of touch to react quickly to changes in their environment," said study co-author Janet Braam, professor and chair of Rice's Department of Biochemistry and Cell Biology.

The famed Venus flytrap uses its sense of touch to rapidly close and trap insects. But in prior research at Rice, Braam and her colleagues showed that Arabidopsis was also extremely responsive to touch. In 2000, her lab used tools of biotechnology to produce a plant that glowed with light wherever it was touched. They also showed that Arabidopsis plants that were touched regularly grew much shorter and slower -- much like trees exposed to a windy coastline will grow short and bent.

"In this new work, we show that jasmonate mediates this growth response in Arabidopsis," Braam said. "Our experiments show that plants that are repeatedly touched maintain high levels of jasmonate and therefore have enhanced insect and fungal tolerance. In addition, we found that eliminating key genes required for jasmonate production results in the inability of plants to grow shorter and slower when touched."

Braam and Chehab also found that plants that were touched often, and consequently had high levels of jasmonate, were more resistant to fungal and insect attacks.

Chehab said plants do not base their production of jasmonate on a single source of information.

"There are multiple signals that can influence the jasmonate response," Chehab said. "Touch is one, but we also recently found that this response can be mediated by the plant's internal clock, or circadian rhythm. It's a complicated picture, but by piecing it together, we get a clearer understanding of plant pest resistance."

INFORMATION:

The research was supported by the National Science Foundation. Additional co-authors include undergraduates Chen Yao and Zachary Henderson, and postdoctoral research associate Se Kim, all of Rice.

High-resolution images are available for download at:

http://news.rice.edu/wp-content/uploads/2012/02/0217_braam-b.jpg
CAPTION: Rice University biologists found that plant defenses against leaf-eating herbivores, like this cabbage looper caterpillar, are activated by the plant's sense of touch.
CREDIT: Tommy LaVergne/Rice University

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CAPTION: Plant growth is affected by touch. Arabidopsis plants that were touched several times each day (right) grew shorter stems than those that were untouched (left). Rice University biologists found that this growth response is controlled by a plant hormone that protects plants from insects and fungal infections.
CREDIT: Wassim Chehab/Rice University

http://news.rice.edu/wp-content/uploads/2012/03/0306_BRAAM.jpg
CAPTION: From left, Rice University biologists Wassim Chehab and Janet Braam found a link between the touch-induced plant growth changes and plant defenses against insects and fungal infections.
CREDIT: Jeff Fitlow/Rice University

Located on a 300-acre forested campus in Houston, Rice University is consistently ranked among the nation's top 20 universities by U.S. News & World Report. Rice has highly respected schools of Architecture, Business, Continuing Studies, Engineering, Humanities, Music, Natural Sciences and Social Sciences and is known for its "unconventional wisdom." With 3,708 undergraduates and 2,374 graduate students, Rice's undergraduate student-to-faculty ratio is 6-to-1. Its residential college system builds close-knit communities and lifelong friendships, just one reason why Rice has been ranked No. 1 for best quality of life multiple times by the Princeton Review and No. 4 for "best value" among private universities by Kiplinger's Personal Finance. To read "What they're saying about Rice," go to www.rice.edu/nationalmedia/Rice.pdf.