The requirement for calcification differs between ecologically important coccolithophore species
Walker, Charlotte E. (University of Southampton)
Taylor, Alison R. (University of North Carolina Wilmington. Department of Biology and Marine Biology)
Langer, Gerald (Marine Biological Association of the United Kingdom)
Durak, Grażyna M. (Marine Biological Association of the United Kingdom)
Heath, Sarah (Marine Biological Association of the United Kingdom)
Probert, Ian (Station Biologique de Roscoff)
Tyrrell, Toby (University of Southampton)
Brownlee, Colin (University of Southampton)
Wheeler, Glen (Marine Biological Association of the United Kingdom)

Fecha:	2018
Resumen:	Coccolithophores are globally distributed unicellular marine algae that are characterized by their covering of calcite coccoliths. Calcification by coccolithophores contributes significantly to global biogeochemical cycles. However, the physiological requirement for calcification remains poorly understood as non-calcifying strains of some commonly used model species, such as Emiliania huxleyi, grow normally in laboratory culture. To determine whether the requirement for calcification differs between coccolithophore species, we utilized multiple independent methodologies to disrupt calcification in two important species of coccolithophore: E. huxleyi and Coccolithus braarudii. We investigated their physiological response and used time-lapse imaging to visualize the processes of calcification and cell division in individual cells. Disruption of calcification resulted in major growth defects in C. braarudii, but not in E. huxleyi. We found no evidence that calcification supports photosynthesis in C. braarudii, but showed that an inability to maintain an intact coccosphere results in cell cycle arrest. We found that C. braarudii is very different from E. huxleyi as it exhibits an obligate requirement for calcification. The identification of a growth defect in C. braarudii resulting from disruption of the coccosphere may be important in considering their response to future changes in ocean carbonate chemistry.
Ayudas:	European Commission 670390
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Calcification ; Coccolithophore ; Coccolithus braarudii ; Emiliania huxleyi ; Phytoplankton
Publicado en:	The new phytologist, Vol. 220, Issue 1 (October 2018) , p. 147-162, ISSN 1469-8137

DOI: 10.1111/nph.15272
PMID: 29916209

16 p, 2.2 MB

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