... acids, specific competitors of B, phenocopies the Arabidopsis thaliana rootless pattern mutant monopteros. At least in part, this is caused by phenylboronic acid (PBA)-induced internalisation of the membrane-localised auxin efflux carrier PINFORMED1 (PIN1) in the early embryo. PIN1 internalisation...

... expression at preprocambial stages is directly and positively controlled by the auxin-response transcription factor MONOPTEROS (MP) through an auxin-response element in the ATHB8 promoter. We finally show that the consequences of loss of ATHB8 function for vein formation are masked by MP activity. Our...

... is known about the functions of individual ARFs in plants. Here, interaction assays, expression studies and combinations of multiple loss- and gain-of-function mutants were used to assess the roles of two ARFs, NONPHOTOTROPIC HYPOCOTYL 4 (NPH4/ARF7)and MONOPTEROS (MP/ARF5), in Arabidopsis development. Both...

... are manifest in cotyledon provascular tissue, suggesting that the patterning defect occurs early in organogenesis. sfc mutants have exaggerated responses to exogenous auxin. Analysis of monopteros ( mp T370 ) sfc-1 double mutants suggested that SFC has partially overlapping functions with MP in patterning...