Glutamine and α-ketoglutarate are metabolic signals involved in nitrate reductase gene transcription in untransformed and transformed tobacco plants deficient in ferredoxin-glutamine-α-ketoglutarate aminotransferase. - Ferrario-Mery,S..; Maslaux,C..; Suzuki,A..; Valadier,M..H..; Hirel,B..; Foyer,C..H.. (Planta, 2001)