Changes in nitrate reductase activity and the protective effect of molybdenum during cold stress in winter wheat grown on acid soil

acid soils cold crecimiento croissance cultivos de invierno culture d'hiver enzimas enzyme enzymes enzymic activity estres feuille frio froid frost frost damage frost protection gel glutamate ammonia ligase glutamina glutamina sintetasa glutamine glutamine synthetase glutaminsynthetase growth helada hojas leaves molibdeno molybdenum nitrate nitrate reductase nitrates nitrato reductasa nitratos nitrite nitrite reductase nitrites nitrito reductasa nitritos proteine proteins sol acide stress triticum aestivum winter crops winterweizen