Ultraviolet Radiation Stimulates Activity of CO₂ Concentrating Mechanisms in a Bloom-Forming Diatom Under Reduced CO₂ Availability.

ABSTRACT: The diatom Skeletonema costatum is cosmopolitan and forms algal blooms in coastal waters, being exposed to varying levels of solar UV radiation (UVR) and reduced levels of carbon dioxide (CO₂). While reduced CO₂ availability is known to enhance CO₂ concentrating mechanisms (CCMs) in this diatom and others, little is known on the effects of UV on microalgal CCMs, especially when CO₂ levels fluctuate in coastal waters. Here, we show that S. costatum upregulated its CCMs in response to UVR (295-395 nm), especially to UVA (320-395 nm) in the presence and absence of photosynthetically active radiation (PAR). The intensity rise of UVA and/or UVR alone resulted in an increase of the activity of extracellular carbonic anhydrase (CAe); and t

SUBMITTER: Gao G 

PROVIDER: S-EPMC8008072 | biostudies-literature | 2021

REPOSITORIES: biostudies-literature