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. 2000 Oct;124(2):885–898. doi: 10.1104/pp.124.2.885

Figure 5.

Figure 5

Proposed electron transport pathways in iron-deficient sugar beet roots. Reduced pyridine nucleotides would reduce flavins (Flv), which are oxidized and in large amounts in the cytosol (up to 700 μm). Flavins would finally provide electrons to the FC-R enzyme of the PM. This enzyme would be able to reduce not only Fe(III)-chelates, but also oxygen when Fe(III)-chelates are absent.