Figure 6From: Adaptation of maize source leaf metabolism to stress related disturbances in carbon, nitrogen and phosphorus balanceRegulation of nitrate metabolism under low temperature, low nitrogen and low phosphorus stress. Transcription of nitrate transporters (NRT), nitrate reductase (NR) and nitrite reductase (NiR) are down-regulated under all three stress conditions, but by different control mechanisms. Under low N the limited availability of nitrate causes down-regulation of nitrate metabolisms, under low temperature and low P conditions on the other hand increases in the amino acid pool were responsible for control of nitrate metabolism. Heat maps show log2 values of fold changes stress/control; data behind NRT and NR are mean values from more than one transcript (see Additional file 5: Table S4); data for amino acid pool averages values from all measured amino acids. [GS- glutamine synthase; GOGAT – glutamate synthetase; 2OG – 2-oxoglutarate].Back to article page