Glutamine synthetase isoenzymes, oligomers and subunits from hairy roots of Beta vulgaris L. var. lutea

azote beta vulgaris cell culture crecimiento croissance culture de cellule darkness enzymic activity glutamate ammonia ligase glutamina sintetasa glutamine synthetase glutaminsynthetase growth isoenzimas isoenzyme isoenzymes light luz metabolism metabolisme metabolismo nitrate nitrates nitratos nitrogen obscuridad plaste plastidios plastids racine roots stoffwechsel