Auxin signaling processes are the mechanism for the communication of information about resources , conditions and gradients of environmental factors to the morphogenetic information system coordinating the growth and development of a multicellular organism plants in the expression of developmental genetic programs . The communication system controlled by auxin at different levels of organization of the plant body is conditioned by the polarity of structural cells ( especially in the meristematic tissue ) , which allows transport of the phytohormone bazypetalny .