0*; *0xbhlh* and wild type seedlings were grown for 0 d at + and −Fe and exposed for 0 h to 000 µM SA (+SA) or were mock-treated (−SA). Whole seedlings were harvested for analysis. n = 0; \* indicates a significant change (p\<0.00) of −Fe versus +Fe; + indicates a significant change (p\<0.00) of *0xbhlh* versus WT; § indicates a significant change (p\<0.00) of +SA versus --SA. Gene expression was studied using reverse transcription-qPCR.](pone.0000000.g000){#pone-0000000-g000}  