United KingdomA new study explores how early land plants may have survived UV radiation by examining a microscopic alga closely related to them. Researchers analyzed Mesotaenium endlicherianum, a single-celled green alga, and discovered it employs a complex system to defend against UV-B radiation. Upon exposure, the algae quickly reorganized internal structures, formed protective vacuoles, and adjusted chloroplast positions to reduce light absorption. Genetically, the algae activated stress-response genes shared with modern land plants, including UV-sensing proteins, DNA repair mechanisms, and hormone-related pathways. Additionally, the algae produced chemical compounds like phenolics, which function as natural sunscreens and antioxidants. These findings suggest that such adaptive strategies may have played a crucial role in enabling early plants to successfully colonize land over 500 million years ago.
Lecture du biais (Centre): The article presents scientific research without political implications. It focuses on biological processes and evolutionary adaptation, using objective language and citing academic sources. There is no indication of ideological framing or partisan emphasis.
