Add time:07/23/2019         Source:sciencedirect.com

Three artificial electron acceptors potassium hexacyanoferrate (K3Fe(CN)6) ‘ferricyanide’ (HCF III), potassium hexachloroiridate (K2 IrCl6) (HCl IV), and potassium hexabromoiridate (K2IrBr6) (HBI IV), have been compared with respect to their reduction by roots, membrane permeability, phytotoxicity and their absorption spectra. In this paper it will be shown that HBI IV as well as HCI IV are more effective electron acceptors than HCF III in regard to their lower charge, redox potential and toxicity. The toxicity of these compounds is negligible when used in micromolar concentrations. Both do not permeate the plasma membrane of root cells. Low concentrations of all three electron acceptors stimulates elongation growth of Lepidium sativum L. roots. The reduction of HBI IV by maize roots was characterized and the effect of artificial auxins on the reduction rate of HBI IV has been investigated.

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