Fig. 4From: CC-type glutaredoxins mediate plant response and signaling under nitrate starvation in ArabidopsisOverexpression of ROXY9 causes the upregulation of the expression of NRT2.1 while overexpression of ROXY15 leads to the downregulation of the expression of NRT2.1. a Expression levels of NRT2.1 in two independent transgenic seedlings overexpressing ROXY9 or ROXY15 (ox) relative to those in the wild type Col-0 seedlings (set to a value of 1). Seven-day-old seedlings grown on complete nutrient medium were used and the expression data were obtained by qRT-PCR. An ACTIN7 was used as a reference gene. Different letters above the bars indicate values that are statistically different (n = 3 biological replicates, P < 0.05; t test). b Expression levels of NRT2.1 in the wild type Col-0 seedlings under nitrate-deficient conditions. Expression levels of NRT2.1 in Col-0 seedlings under nitrate-deficient conditions relative to those in Col-0 seedlings under nitrate-sufficient conditions (set to a value of 1). Six-day-old seedlings were grown on complete nutrient media and transferred to media with either 4 mM nitrate (+N) or no nitrate (-N), and further grown for 6, 12, and 24 h. Then, all seedlings were harvested at the end of the light period (zeitgeber time 16). An ACTIN7 was used as a reference gene. Different letters above the bars indicate values that are statistically different (n = 3 biological replicates, P < 0.05; t test)Back to article page