Mycosporine-like amino acids (MAAs) protect against UV-B-induced damage in Gyrodinium dorsum Kofoid

doi:10.1078/0176-1617-00552

Journal of Plant Physiology

Volume 158, Issue 11, 2001, Pages 1449-1454

https://doi.org/10.1078/0176-1617-00552 Get rights and content

Summary

The protective effect of mycosporine-like amino acids (MAAs) against ultraviolet-B (UV-B; 280-315 nm) radiation has been studied in the marine dinoflagellate Gyrodinium dorsum. Cultures were irradiated with artificial (simulated) solar radiation with 320-nm (UV-A + PAR) and 395-nm (PAR only) cut-off filters for a period of up to 48 h in order to stimulate the synthesis of MAAs in the cells. A pronounced rise in the amount of MAAs was detected in the cells that were exposed to UV-A + PAR, while cells that were exposed to PAR induced only a marginal increase in their MAAs content. HPLC analyses of the samples revealed the presence of five MAAs, i.e., shinorine (λ_max 334 nm), porphyra-334 (λ_max 334 nm), palythine (λ_max 320 nm), and two unidentified MAAs having λ_max at 310 and 331 nm. Both cultures (one having high MAAs and another having low MAAs content) were subjected to high UV-B (8 W m⁻²) irradiation from a transilluminator, and motility and velocity were analyzed at regular time intervals. Cells with low MAAs content suffered a complete loss of motility within 3 h, while the cells with high MAAs content survived at least 2 times longer. The results provide further evidence that MAAs function as a UV-B absorbing/screening compound in G. dorsum and help them survive in high UV-B radiation regimes.

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Mycosporine-like amino acids (MAAs) protect against UV-B-induced damage in Gyrodinium dorsum Kofoid

Summary

J Photochem Photobiol B: Biol

J Photochem Photobiol B: Biol

Tetrah Lett

J Photochem Photobiol B: Biol

J Chromatogr

J Photochem Photobiol B: Biol

J Photochem Photobiol B: Biol

Env Exp Bot

Wat Res

Tetrah Lett

Simulation of the effects of naturally enhanced UV-radiation on photosynthesis of Antarctic phytoplankton

Mar Ecol Prog Ser

Photomovement and photobleaching in two Gyrodinium species

Plant Cell Physiol

The absorption of ultraviolet radiation by microalgae: simple optics and photobiological implications

Sci Mar

Occurrence of UV-absorbing, mycosporine-like compounds among cyanobacterial isolates and an estimate of their screening capacity

Appl Environ Microbiol

Differential effects of ultraviolet radiation on green and brown morphs of the Carribean coral Porites astreoides

Limnol Oceanogr

Ultraviolet-B inhibition of motility in green and dark bleached Euglena gracilis

Current Microbiol