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. 2016 Mar 24;7:369. doi: 10.3389/fpls.2016.00369

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Copyright © 2016 Gupta and Igamberdiev.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Operation of the phytoglobin/NO cycle between the anoxic mitochondrion and cytosol. Nitrite reduction and NO formation occur at COX and complex III (bc₁). NO diffuses to the cytosol where it is converted to nitrate (NO₃^-) by the oxygenated non-symbiotic phytoglobin (PgbO₂). Metphytoglobin (MetPgb) formed in this reaction is recycled by metphytoglobin reductase (MetPgbR) and the product nitrate is reduced by nitrate reductase (NR) to nitrite, which is transported to mitochondria by a putative nitrite transporter (NT). NAD(P)H is oxidized by the externally facing mitochondrial dehydrogenases (ND). Q, ubiquinone; c, cytochrome c. Modified from Gupta and Igamberdiev (2011).