Increasing copper alters cellular elemental composition (Mo and P) of marine diatom

Ecology and Evolution
Deli WangKunshan Gao

Abstract

The elemental composition (surface adsorbed and internalized fraction of Cu, Mo and P) in marine phytoplankton was first examined in cultures of the diatom Phaeodactylum tricornutum which were exposed to various levels of Cu concentrations ranging from 0.25 to 16 μmol/L with equivalent free [Cu2+] concentrations of 0.4-26 nmol/L. We observed an acceleration of algal growth rates (20-40%) with increasing ambient Cu levels, as well as slightly increased levels of internalized Cu in cells (2-13 × 10-18 mol/cell) although cellular Cu mostly accumulated onto the cell surface (>50% of the total: intracellular + surface adsorbed). In particular, we documented for the first time that the elemental composition (Mo and P) in algal cells varies dynamically in response to increased Cu levels: (1) Cellular P, predominantly in the intracellular compartment (>95%), shows with a net consumption as indicated by a gradual decrease with increasing [Cu2+] (120→50 × 10-15 mol P/cell) probably due to the fact that P, a backbone bioelement, is largely required in forming biological compartments such as cell membranes; and (2) cellular Mo, predominantly encountered in the intracellular compartment, showed up to tenfold increase in concentration in the...Continue Reading

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Citations

Mar 20, 2019·Scientific Reports·Carole GuggenheimBernhard Wehrli
Nov 8, 2018··Wulan Kurnia WardaniSuwarno Hadisusanto

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