Results indicate that auxin response factors AtARF2-AtARF4 and AtARF5 play significant roles in regulating both female and male gametophyte development.
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.
results demonstrate that ARF2 plays important roles in the response to external K(+) supply in Arabidopsis and regulates HAK5 transcription accordingly.
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