Antagonistic regulation of PIN phosphorylation by PP2A and PINOID directs auxin flux.

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PIN-Dependent Auxin Transport: Action, Regulation, and Evolution (2015, background): “Genetic interactions supported the notion that PP2AA phosphatase function antagonizes that of PID kinase.”
Regulation of Somatic Embryogenesis in Higher Plants (2010, background): “Several in vivo functions have been attributed to nonspecific LTPs, including transport of cuticular compounds (Sterk et al., 1991) and inhibition of the growth of bacterial and fungal pathogens (Molina et al., 1993).”
Auxin transport routes in plant development (2009, background): “AU X1 AB CB AB CB PI N GEF ARF GNOM ARF Transcytosis Recycling PI N AXR4 GEF ARF P ARF-GEFdependent PM deposition Endoplasmic reticulum Trans-Golgi Vacuole PVC PID SNX1 VPS29 Retromerdependent retrieval and sorting Golgi ARF-GEFdependent PM deposition GNOMdependent PM deposition PI N GNL1 Endoplasmi”
Auxin: the looping star in plant development. (2008, background): “subcellular targeting of the constituent proteins is regulated by components involved in endosomal trafficking, and also depends on the phosphorylation status of the proteins, as well as on components that determine membrane composition (38, 44, 71, 135).”