Avoiding and allowing apatite precipitation in oxygenic photolithotrophs
- Publisher:
- Wiley
- Publication Type:
- Journal Article
- Citation:
- New Phytologist, 2023, 238, (5), pp. 1801-1812
- Issue Date:
- 2023-06
Open Access
Copyright Clearance Process
- Recently Added
- In Progress
- Open Access
This item is open access.
The essential elements Ca and P taken up and used metabolically as Ca sup 2 sup and H sub 2 sub PO sub 4 sub sup sup HPO sub 4 sub sup 2 sup respectively could precipitate as one or more of the insoluble forms calcium phosphate mainly apatite if the free ion concentrations and pH are high enough In the cytosol chloroplast stroma and mitochondrial matrix the very low free Ca sup 2 sup concentration avoids calcium phosphate precipitation apart from occasionally in the mitochondrial matrix The low free Ca sup 2 sup concentration in these compartments is commonly thought of in terms of the role of Ca sup 2 sup in signalling However it also helps avoids calcium phosphate precipitation and this could be its earliest function in evolution In vacuoles cell walls and xylem conduits there can be relatively high concentrations of Ca sup 2 sup and inorganic orthophosphate but pH and or other ligands for Ca sup 2 sup suggests that calcium phosphate precipitates are rare However apatite is precipitated under metabolic control in shoot trichomes and by evaporative water loss in hydathodes in some terrestrial flowering plants In aquatic macrophytes that deposit CaCO sub 3 sub on their cell walls or in their environment as a result of pH increase or removal of inhibitors of nucleation or crystal growth phosphate is sometimes incorporated in the CaCO sub 3 sub Calcium phosphate precipitation also occurs in some stromatolites
Please use this identifier to cite or link to this item: