Ethylene sensor could help monitor plant health

March 18, 2020

To control flowering and fruit ripening, plants release the gaseous hormone ethylene. Environmental conditions, including drought, salinity and pathogens, can also cause levels of the hormone to fluctuate. Therefore, monitoring ethylene's release in real time could provide a farmer with important information about a plant's development and health. Now, researchers reporting in ACS Central Science have developed an easy-to-use, robust sensor that can do just that.

Because of the key role ethylene plays in plant health, the agricultural industry is interested in monitoring the hormone. Early detection of changes in the release of this gas could allow farmers to take preventative actions that restore plant health, reducing crop losses. However, existing sensors have limitations that make them impractical for use in the field. Timothy Swager, Darryl Fong and colleagues at the Massachusetts Institute of Technology wanted to make a sensor that could sensitively detect changes in ethylene levels.

The new sensor contains a network of single-walled carbon nanotubes (SWCNTs) on a piece of glass, sandwiched between gold electrodes. The researchers placed a catalytic mixture containing palladium on top of the SWCNTs. In a chemical reaction known as Wacker oxidation, the palladium catalyst converted ethylene gas to acetaldehyde. During this reaction, palladium changed its oxidation state and interactions with the SWCNTs, altering their electrical conductance. In this way, the researchers could monitor changes in ethylene gas levels over time. To demonstrate the sensor, the team placed carnations or lisianthus flowers in a chamber with the device and observed fluctuations in ethylene production as the flowers bloomed and faded. The device can detect parts-per-billion concentrations of the gas within the chamber, and with this sensitivity it could potentially be used to monitor plants in the field, the researchers say.
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The authors acknowledge funding from the Natural Sciences and Engineering Research Council of Canada Postdoctoral Fellowships Program, the São Paulo Research Foundation, the National Science Foundation and the U.S. Army Engineer Research and Development Center.

The paper's abstract will be available on March 18 at 8 a.m. Eastern time here: http://pubs.acs.org/doi/abs/10.1021/acscentsci.0c00022

The American Chemical Society (ACS) is a nonprofit organization chartered by the U.S. Congress. ACS' mission is to advance the broader chemistry enterprise and its practitioners for the benefit of Earth and its people. The Society is a global leader in providing access to chemistry-related information and research through its multiple research solutions, peer-reviewed journals, scientific conferences, eBooks and weekly news periodical Chemical & Engineering News. ACS journals are among the most cited, most trusted and most read within the scientific literature; however, ACS itself does not conduct chemical research. As a specialist in scientific information solutions (including SciFinder® and STN®), its CAS division powers global research, discovery and innovation. ACS' main offices are in Washington, D.C., and Columbus, Ohio.

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