 + and −Fe. Roots 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. Gene expression was studied using reverse transcription-qPCR.](pone.0000000.g000){#pone-0000000-g000}  In addition