NAD(P)H-quinone oxidoreductase subunit 2 is involved in the transfer of electrons from NAD(P)H:plastoquinone, via FMN and iron-sulfur centers, to quinones in the photosynthetic chain and possibly in a chloroplast respiratory chain. Alternative names: NAD(P)H dehydrogenase, subunit 2, NADH-plastoquinone oxidoreductase subunit 2.