"ABA treatment reduced the expression levels of the PIN-FORMEDs (PIN) auxin efflux carriers PIN1 PIN3 PIN4 and PIN7 to a greater extent in the root meristems of arf2-101 mutant than in the wild type. ARF2 positively mediates the transcripts of transcription factor PLETHORA 1 (PLT1) gene but negatively mediates PLT2 at protein level in root meristems."xsd:string