The speed of its transfer down the stem from the shoot apex is about 10 milimeters per hour, too fast for diffusion, and it is believed that it is transported directly through parenchyma tissue by polar transport.  
The speed of its transfer down the stem from the shoot apex is about 10 milimeters per hour, too fast for diffusion, and it is believed that it is transported directly through parenchyma tissue by polar transport.  One of its secondary effects is to induce cell division in the vascular cambium, and at higher concentrations than 10 to the negative 3rd moles, it can actually inhibit the effect it is meant to produce. Also known as idoleacetic acid, and synthesized in the apical meristem, FTP, identify this plant hormone that stimulates proton pumps and promotes the growth of plant cells
The speed of its transfer down the stem from the shoot apex is about 10 milimeters per hour, too fast for diffusion, and it is believed that it is transported directly through parenchyma tissue by polar transport.  
auxin