Enhanced calcification ameliorates the negative effects of UV radiation on photosynthesis in the calcifying phytoplankter Emiliania huxleyi

The calcifying phytoplankton species, coccolithophores, have their calcified coccoliths around the cells, however, their physio- logical roles are still unknown. Here, we hypothesized that the coccoliths may play a certain role in reducing solar UV radiation （UVR, 280-400 nm） and protect the ceils f...

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Bibliographic Details
Published in:Chinese science bulletin 2010-03, Vol.55 (7), p.588-593
Main Authors: Guan, WanChun, Gao, KunShan
Format: Article
Language:English
Subjects:
Chemistry/Food Science
Coccolithus huxleyi
Earth Sciences
Emiliania huxleyi
Engineering
Humanities and Social Sciences
Life Sciences
multidisciplinary
Physics
PSII
Science
Science (multidisciplinary)
光化学效率
光合作用
太阳紫外线辐射
溶解无机碳
特定生长率
颗石藻
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Summary:The calcifying phytoplankton species, coccolithophores, have their calcified coccoliths around the cells, however, their physio- logical roles are still unknown. Here, we hypothesized that the coccoliths may play a certain role in reducing solar UV radiation （UVR, 280-400 nm） and protect the ceils from being harmed. Cells of Emiliania huxleyi with different thicknesses of the cocco- liths were obtained by culturing them at different levels of dissolved inorganic carbon and their photophysiological responses to UVR were investigated. Although increased dissolved inorganic carbon decreased the specific growth rate, the increased coccolith thickness significantly ameliorated the photoinhibition of PSII photochemical efficiency caused by UVR. Increase by 91% in the coccolith thickness led to 35% increase of the PSII yield and 22% decrease of the photoinhibition of the effective quantum yield （qbPSii） by UVR. The coccolith cover reduced more UVA （320-400 nm） than UVB （280-315 nm）, leading to less inhibition per energy at the UV-A band.
ISSN:1001-6538
1861-9541
DOI:10.1007/s11434-010-0042-5