Photosynthetic algae evolve distinctive pigments to defend from daylight and increase vitality effectivity
by Riko Seibo
Tokyo, Japan (SPX) Oct 23, 2025
Marine inexperienced algae have developed a exceptional protection in opposition to the dangerous results of extra daylight, in keeping with a research by Osaka Metropolitan College and its worldwide analysis companions. The investigation revealed {that a} pigment referred to as siphonein acts as a protecting defend, enabling algae to keep up environment friendly photosynthesis with out risking injury from overexposure to mild.
The analysis centered on the marine alga Codium fragile, which, like land vegetation, incorporates light-harvesting complexes outfitted with chlorophyll to soak up daylight. Nevertheless, Codium fragile stands out resulting from its incorporation of distinctive carotenoids, notably siphonein and siphonaxanthin, which permit efficient use of inexperienced mild underneath water.
“Organisms use carotenoids to rapidly dissipate extra vitality, or quench these triplet states, by means of a course of referred to as triplet-triplet vitality switch (TTET),” mentioned Ritsuko Fujii, affiliate professor at Osaka Metropolitan College. Utilizing a specialised electron paramagnetic resonance spectroscopy methodology, the crew straight noticed that Codium fragile’s carotenoids eradicate probably damaging chlorophyll triplet states much more successfully than in spinach vegetation.
The scientists found that siphonein’s placement within the light-harvesting antenna construction is essential for this energy-dissipating course of, and additional quantum chemical simulation confirmed the digital construction’s key position in stopping oxidative hurt whereas bettering photosynthetic efficiency.
Algae’s evolutionary adaptation, proven on this research, not solely helps them stand up to vibrant marine daylight however could pave the way in which for bio-inspired enhancements in photo voltaic vitality expertise. The crew now hopes to establish structural options in carotenoids that maximize vitality quenching, probably revolutionizing the design of synthetic photosynthetic and renewable vitality techniques.
“Our analysis has revealed that the antenna construction of photosynthetic inexperienced algae has a superb photoprotective operate,” said Alessandro Agostini, College of Padua, co-lead creator of the research. “We hope to additional make clear the structural traits of carotenoids that enhance quenching effectivity, in the end enabling the molecular design of pigments that optimize photosynthetic antennae,” Fujii mentioned.
Analysis Report:Siphonein enables an effective photoprotective triplet quenching mechanism in green algal light-harvesting complexes
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Osaka Metropolitan University
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