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. 2015 Aug 20;116(4):555–569. doi: 10.1093/aob/mcv122

Fig.9.

Fig.9.

A simple scheme illustrating the impact of AOX1A deficiency on mitochondrial respiration and chloroplastic photosynthesis, when electron transport through the COX pathway is restricted at complex III using AA in leaf discs of Arabidopsis under growth light conditions: (1) over-reduction of mETC and ROS accumulation due to restricted COX and AOX pathways; (2) decrease in Asc biosynthesis; (3) low thylakoid energization; (4) acceptor limitation at PSI; (5) decrease in photosynthetic carbon assimilation; (6) lack of electron sink in mitochondria leads to impairment of photosynthesis. The broken lined arrows indicate a reduction in utilization of reducing equivalents. AA, antimycin A; AOX1A, alternative oxidase 1a; Asc, ascorbate; CI, complex I; CIII, complex III; CIV, complex IV; mETC, mitochondrial electron transport chain; GL, l-galactono-1,4-lactone; GLDH, l-galactono-1,4-lactone dehydrogenase; NPQ, non-photochemical quenching; PSI, photosystem I; PSII, photosystem II; ROS, reactive oxygen species; UQ, ubiquinone.