Reduced calcification decreases photoprotective capability in the coccolithophorid Emiliania huxleyi

Plant & Cell Physiology
Kai Xu, Kunshan Gao

Abstract

Intracellular calcification of coccolithophores generates CO₂ and consumes additional energy for acquisition of calcium and bicarbonate ions; therefore, it may correlate with photoprotective processes by influencing the energetics. To address this hypothesis, a calcifying Emiliania huxleyi strain (CS-369) was grown semi-continuously at reduced (0.1 mM, LCa) and ambient Ca²⁺ concentrations (10 mM, HCa) for 150 d (>200 generations). The HCa-grown cells had higher photosynthetic and calcification rates and higher contents of Chl a and carotenoids compared with the naked (bearing no coccoliths) LCa-grown cells. When exposed to stressfull levels of photosynthetically active radiation (PAR), LCa-grown cells displayed lower photochemical yield and less efficient non-photochemical quenching (NPQ). When the LCa- or HCa-grown cells were inversely shifted to their counterpart medium, LCa to HCa transfer increased photosynthetic carbon fixation (P), calcification rate (C), the C/P ratio, NPQ and pigment contents, whereas those shifted from HCa to LCa exhibited the opposite effects. Increased NPQ, carotenoids and quantum yield were clearly linked with increased or sustained calcification in E. huxleyi. The calcification must have played a r...Continue Reading

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Citations

May 23, 2013·The New Phytologist·Michal BochenekStanislav Kopriva
Jul 3, 2013·Evolution; International Journal of Organic Evolution·Peng JinJohn Beardall
Nov 5, 2016·Annual Review of Marine Science·Alison R TaylorGlen Wheeler
Jul 22, 2014·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Candela García-GómezMaría Segovia
Jul 28, 2016·Science Advances·Fanny M MonteiroAndy Ridgwell
Apr 30, 2013·Current Eye Research·Joseph CarrollMarco Lombardo

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