The directional transport of the phytohormone auxin is required for proper plant development and tropic growth. Auxin cell-to- cell transport gains directionality through the polar distribution of ‘canonical’ long PIN-FORMED (PIN) auxin efflux carriers. In recent years, AGC kinases, MAP kinases, Ca2+/CALMOD- ULIN-DEPENDENT PROTEIN KINASE-RELATED KINASEs and receptor kinases have been implicated in the control of PIN activity, polarity and trafficking. In this review, we sum- marize the current knowledge in understanding the post- translational regulation of PINs by these different protein kinase families. The proposed regulation of PINs by AGC ki- nases after salt stress and by the stress-activated MAP ki- nases suggest that abiotic and biotic stress factors may modulate auxin transport and thereby plant growth.     «

The directional transport of the phytohormone auxin is required for proper plant development and tropic growth. Auxin cell-to- cell transport gains directionality through the polar distribution of ‘canonical’ long PIN-FORMED (PIN) auxin efflux carriers. In recent years, AGC kinases, MAP kinases, Ca2+/CALMOD- ULIN-DEPENDENT PROTEIN KINASE-RELATED KINASEs and receptor kinases have been implicated in the control of PIN activity, polarity and trafficking. In this review, we sum- marize the current k...     »