How touchy plants go on the defensive

When touched, plant defenses go into overdrive to fight off  fungal infections and insect invaders. “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,” says Wassim Chehab, a faculty fellow in the department of biochemistry and cell biology at Rice University and lead author of the 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. Published in the journal Current Biology, 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 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,” says study co-author Janet Braam, professor and chair of the 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 says. “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.” Plants that were touched often, and consequently had high levels of jasmonate, were also more resistant to fungal and insect attacks. Plants do not base their production of jasmonate on a single source of information, Chehab says. “There are multiple signals that can influence the jasmonate response. 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.” The research was supported by the National Science Foundation.