Wearable Sensor Detects Plant Stress in Real Time
Researchers have developed an innovative wearable sensor that attaches directly to plant leaves, allowing real-time detection of stress signals before visible symptoms emerge. This electrochemical patch monitors hydrogen peroxide levels—a key indicator of plant distress caused by factors such as pests, drought, extreme temperatures, and infections.
How the Sensor Works
The sensor comprises a flexible base embedded with microscopic plastic needles. Specifically, these needles penetrate the leaf’s surface, allowing the sensor to detect subtle changes in hydrogen peroxide concentrations. The device’s surface is coated with a chitosan-based hydrogel containing an enzyme that reacts with hydrogen peroxide to produce electrons. As a result, these electrons are conducted through reduced graphene oxide, generating a measurable electrical current.
Successful Testing on Crops
In trials conducted on soybean and tobacco plants infected with the bacterial pathogen Pseudomonas syringae pv. tomato DC3000, the sensor demonstrated a rapid response. Remarkably, it detected elevated hydrogen peroxide levels within approximately one minute. The measurements were accurate and consistent with conventional laboratory analyses. Notably, the patches remained functional through nine applications before the microneedles began to degrade.
Potential Benefits for Farmers and Gardeners
This advancement offers a cost-effective and efficient tool for farmers and gardeners to monitor plant health proactively. By doing so, early detection of stress allows timely interventions, potentially enhancing crop yields and reducing losses. Dr. Liang Dong, one of the lead researchers, emphasized the practicality of the technology, stating, “We can achieve direct measurements in under a minute for less than a dollar per test.”
