Encodes a protein of the chloroplastic NAD(P)H dehydrogenase complex (NDH Complex) involved in respiration, photosystem I (PSI) cyclic electron transport and CO2 uptake. The product of this gene appears to be essential for the stable formation of the NDH Complex. The mRNA is cell-to-cell mobile.
Required for both formation and activity of the chloroplast NAD(P)H dehydrogenase (NDH) complex of the photosynthetic electron transport chain. May function in assembly or stabilization of the NDH complex (PubMed:16359395, PubMed:20444231). Required for the accumulation of NDH subcomplex A, which is a core part of NDH. May be involved in post-translational steps during the biogenesis of subcomplex A (PubMed:20444231).