Signatures for conserved phenolic-based acclimation responses to UV in a unicellular algal sister of land plants
Year: 2026
Type: preprint
Abstract: Ultraviolet (UV) light is a major stressor that particularly comes to bear in the terrestrial habitat. As such it is among the major challenges that the earliest land plants had to overcome. The closest algal relatives of land plants, the zygnematophytes, are single celled and filamentous algae that - in the context of their terrestrial and freshwater habitats - have diverse adaptations to UV irradiance. As such, contextualized with data on land plants, zygnematophyte algae harbor important information for inferring how the earliest land plants have acclimated to UV. Here we exposed the unicellular zygnematophyte model Mesotaenium to daily UV irradiance and assessed its response through microscopy, untargeted metabolomics, and global gene expression profiling using transcriptomics. Our data reveal cell biological acclimation by formation of lipid droplets. Further, we find that the cells accumulated chemodiverse coumarin-like derivatives. Altogether, our data suggest that acclimation to long-term UV exposure is composed of building blocks of a molecular chassis conserved with that of land plants, underpinned by phenolics and genes that are tied to their biosynthesis. From this chassis, divergent evolutionary trajectories have assembled them into a divergent conformation - one of which ushering in the emergence of the phenylpropanoid pathway.
Institution: University of Göttingen
Language: English
Topic: Light effects on plants
Subfield: Plant Science
Domain: Life Sciences
Open Access status: green
Funders: International Max Planck Research School for Environmental, Cellular and Molecular Microbiology, European Commission, Deutsche Forschungsgemeinschaft, Georg-August-Universität Göttingen, Göttinger Graduiertenschule für Neurowissenschaften, Biophysik und Molekulare Biowissenschaften, International Max Planck Research School for Advanced Methods in Process and Systems Engineering, HORIZON EUROPE Framework Programme
Awards: G109852973, Hochauflösendes TandemMassenspektrometer mit Flüssigkeitschromatographie (UHPLCQTOFMS), G1906777466, Koordinationsfonds, G3313770593, G3953187464, G3973409790, Klebsome: Genomdiversität und Anpassungen an terrestrische Habitate in Klebsormidiophyceen, G5796858870, G6004009250, G6070040080, Analyse der evolutionären Chemodiversität, des Metabolismus, und der Funktion von Sphingolipiden in den Zygnematophyceaen Spirogyra pratensis und Mougeotia scalaris und den Bryophyten Marchantia polymorpha und Physcomitrella patens, G680535423, Carotology: Sind Apocarotinoide konservierte Modulatoren der Streptophytenphysiologie?
OpenAlex ID: W7225408519