Dual-Color Bioluminescence Turns Glowing Plants into Living Biosensors
Researchers at the MRC Laboratory of Medical Sciences and Light Bio engineered a two-color reporter to track immune responses without metabolic distortion.
By Giovanni Sapere
2 min readHuman-Edited, AI-Assisted
Scientists at the MRC Laboratory of Medical Sciences and commercial partner Light Bio have engineered a dual-color autoluminescent system that tracks plant immune defenses in real time. The approach bypasses metabolic fluctuations by measuring the ratio between green and red light emissions rather than raw brightness. The work, published in Nature Plants, converts self-sustained light emission into a precise quantitative tool for tracking plant health over extended timeframes.
Overcoming metabolic distortion in autoluminescence
Autoluminescence allows genetically engineered organisms to produce their own light without requiring external chemical substrates or invasive monitoring hardware. However, standard self-sustaining reporters have suffered from significant noise: variations in temperature, oxygen supply, and metabolic activity alter light intensity independently of the targeted biological event. In a biological innovation reported by Phys.org, researchers led by Karen Sarkisyan at the MRC Laboratory of Medical Sciences (LMS), working alongside commercial startup Light Bio, developed a method to eliminate this background interference.
“This turns autoluminescence from a qualitative tool into a quantitative one. In practice, it means researchers can monitor molecular processes over long periods simply by taking photographs in the dark, without expensive equipment or invasive treatments.”
— Karen Sarkisyan, group head at the MRC Laboratory of Medical Sciences
Engineering an internal dual-color reference
To build a robust quantitative readout, the team engineered a red-shifted fungal luciferase and combined it with an established green luminescent reporter. Instead of tracking total luminous output, the sensor calculates the exact ratio of the two distinct wavelengths emitted by the tissue. Because metabolic surges or dips affect both wavelengths equally, calculating the color ratio neutralizes background shifts. As detailed in Nature Plants, this ratiometric configuration transforms autoluminescence from an observational novelty into an analytical instrument, functioning reliably across both fungal and bacterial bioluminescence pathways.
Visualizing immune activity around infection sites
The research team validated the sensor in Arabidopsis thaliana, observing specimens aged between 42 and 44 days over time-lapse recordings lasting up to 53 hours. By tracking the defense signaling promoter pWRKY70 against a control reporter designated Luz593, the setup captured localized immune activation directly surrounding infection boundaries. According to Phys.org, the ratio metric permitted continuous, non-invasive imaging in ordinary darkness using photographic sensors, eliminating the need for expensive diagnostic assays or chemical treatments.
What to watch in agricultural and clinical applications
The researchers are exploring broader implementations for this dual-wavelength reporting architecture. In crop science, the technology transfer could lead to autonomous sentinel plants that change emission color to signal pathogen attack, nutrient deficiencies, or environmental stress under field conditions. According to the research group, future studies will evaluate whether analogous dual-color luciferase pathways can be adapted into animal cells and disease models to observe long-term hormonal shifts and genetic regulation.
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