Ultraviolet radiation stimulated activity of extracellular carbonic anhydrase in the marine diatom Skeletonema costatum

Functional Plant Biology : FPB
Hongyan Wu, Kunshan Gao

Abstract

Previous studies have shown that reduced levels of solar UV radiation (280-400 nm) can enhance photosynthetic carbon fixation of marine phytoplankton, but the mechanisms are not known. The supply of CO2 for photosynthesis is facilitated by extracellular (periplasmic) carbonic anhydrase (CAe) in most marine phytoplankton species. The present study showed that the CAe activity of Skeletonema costatum (Greville) Cleve was stimulated when treated with UV-A (320-395 nm) or UV-A + UV-B (295-320 nm) in addition to visible radiation. The presence of UV-A and UV-B enhanced the activity by 28% and 24%, respectively, at a low irradiance (PAR 161, UV-A 28, UV-B 0.9 W m-2) and by 21% and 19%, respectively, at a high irradiance (PAR 328, UV-A 58, UV-B 1.9 W m-2) level after exposure for 1 h. Ultraviolet radiation stimulated CAe activity contributed up to 6% of the photosynthetic carbon fixation as a result of the enhanced supply of CO2, as revealed using the CAe inhibitor (acetazolamide). As a result, there was less inhibition of photosynthetic carbon fixation compared with the apparent quantum yield of PSII. The UV radiation stimulated CAe activity coincided with the enhanced redox activity at the plasma membrane in the presence of UV-A and...Continue Reading

References

Nov 1, 1990·Plant Physiology·M L Dionisio-SeseS Miyachi
May 15, 2007·Plant Physiology·Kunshan GaoE Walter Helbling
May 15, 2007·Photosynthesis Research·Karen RobertsJohn A Raven
Apr 1, 2002·Functional Plant Biology : FPB·Brian ColmanJeffrey S Dason

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Citations

Mar 6, 2010·Photochemistry and Photobiology·Juntian Xu, Kunshan Gao
Aug 27, 2009·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·John BeardallSlobodanka Stojkovic
Jan 22, 2011·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·D-P HäderR C Worrest
Dec 24, 2015·Applied Biochemistry and Biotechnology·Guanhua HuangAn Qin
Jul 25, 2021·International Journal of Molecular Sciences·Nur Ili Hamizah MustaffaOliver Wurl

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