Involved in the basipetal transport of auxin (IAA) that modulates growth and organs organization. Required for initial divisions in the epidermal/lateral root cap leading to the formation of epidermal cells and a clone of lateral root cap cells, as well as for the maintenance of the radial pattern of cell specification in the root, thus regulating the distinction between the lateral root cap and epidermis. Expressed in seedlings, roots, leaves, stems and flowers. Present in ovules, prominently in nucellus and integuments. Strongly expressed in the shoot apical meristem (SAM) and the young leaf primordia. Also detected in the lamina of the cotyledons, especially in the mesophyll and vascular bundles. Severe dwarfism combined with twisted and malformed organs, and sterility. Loss of initial meristematic divisions in the epidermal/lateral root cap. Defection in basipetal transport of auxin (IAA) leading to several development aberrations.