Two-heme-containing cytochrome (PubMed:24449903). Catalyzes ascorbate-dependent transmembrane ferric-chelate reduction (Probable). Fe(3+)(out) + L-ascorbate(in) = Fe(2+)(out) + H(+) + monodehydro-L-ascorbate radical(in) Binds 2 heme b groups non-covalently. Homodimer. Expressed in roots, seedlings, leaves and flowers. Expressed in the L1 layer of the shoot apex, in the epidermis of leaf primordia and young leaves and in vascular bundles. In the differentiation zone of the root, detected in the pericycle and in the epidermis, but not in the cortex. Strongly expressed in the cortical region of the root tip, in the meristematic tissue and in the epidermal cell layer of lateral roots, but not in the root caps. Highly expressed in unfertilized ovules. In mature embryos, expressed in the epidermis, cotyledon tips and root tips. Strong reduction in expression levels in flowers following fertilization.