Chlorophyll fluorescence illuminates plant function

Chlorophyll fluorescence illuminates view of plant function
From left to right: Solar induced chlorophyll-a fluorescence can be seen with bare eyes after dissolving the chlorophyll from leaves into a solvent and placing the extract under direct sunlight. SIF can be measured at the plant, ecosystem (here: apple orchard), and global scales. Credit: Albert Porcar-Castell

Chlorophyll, the green pigment found in plants and algae, emits faint red and far-red light when illuminated during photosynthesis. This so called chlorophyll-a fluorescence conveys information about the instantaneous rate of photosynthesis, which provides an "optical window" that tracks plant functional and health status.

Although methods to measure and interpret chlorophyll-a fluorescence at the leaf and subcellular levels have been around for decades, it is only recently that (known as solar-induced , SIF) can be estimated and imaged at the ecosystem and regional scales.

Cutting edge SIF measurements are conducted with hyperspectral optical sensors mounted on towers, drones, aircraft, and even satellites. For example, the FLuorescence EXplorer (FLEX) satellite mission from the European Space Agency is scheduled for launch in 2024 and will provide global maps of SIF at a resolution of a few hundred meters.

These developments pave the way to multiple scientific and in plant ecophysiology, ecology, biogeochemistry, as well as precision agriculture and forestry.

"Excitingly, SIF opens up spatial and 3D photosynthesis studies in the field. This will help to resolve long standing research questions related to the photosynthetic dynamics of the different parts of a plant or ecosystem in real world conditions. SIF can also be applied in physiological phenotyping and pre-visual stress detection, which is a powerful tool for next-generation forest and crop management practices," says Albert Porcar-Castell from the University of Helsinki.

To meet these ambitious goals, multiscale and multidisciplinary collaborative studies are required. Expertise from , , agronomy and forestry should be fused to translate the information content of SIF into innovative applications capitalizing on insight across the molecular, leaf and canopy scales.

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More information: Albert Porcar-Castell et al, Chlorophyll-a fluorescence illuminates a path connecting plant molecular biology to Earth-system science, Nature Plants (2021). DOI: 10.1038/s41477-021-00980-4
Journal information: Nature Plants

Citation: Chlorophyll fluorescence illuminates plant function (2021, August 10) retrieved 24 October 2021 from
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