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Physiological response of marine centric diatoms to ultraviolet radiation, with special reference to cell size

Paper ID Volume ID Publish Year Pages File Format Full-Text
30098 44460 2015 6 PDF Available
Title
Physiological response of marine centric diatoms to ultraviolet radiation, with special reference to cell size
Abstract

•Thalassiosira is a genus with relatively high UV resistance.•Larger diatoms are less affected by UV radiation.•Intracellular UV distribution is one of the key determinants for UV sensitivity.

Three centric diatoms, Thalassiosira pseudonana (diameter ~ 4 μm), Thalassiosira weissflogii (~ 11 μm), and Thalassiosira punctigera (~ 47 μm), were exposed to low and high levels of UV radiation. UV-induced inhibition on photosystem II was correlated with cell size under high light levels, though it was insignificant under low light levels (PAR < 63 W m− 2). The highest inhibition (~ 15%) was observed for the smallest species. Several mechanisms may explain the observed relationship between cell size and response to UV. All three species counteracted UV-related photosystem damage via protein synthesis within the chloroplast. Non-photochemical quenching (NPQ) was induced when that process was blocked with an inhibitor in T. pseudonana and T. weissflogii, but not T. punctigera, as neither radiation nor the inhibitor had a significant effect on NPQ in this species. Moreover, UV-induced inhibition for cells treated with lincomycin was highest for T. weissflogii, which was in accordance with the highest UV exposure within the cell. The intracellular UV distribution was not associated with cell size, indicating that the package effect was not the only determinant of cell-size dependent UV sensitivity in phytoplankton.

Keywords
Cell size; Diatom; Photosystem; Thalassiosira; UV radiation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology B: Biology - Volume 153, December 2015, Pages 1–6
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us