Calmodulin mediates the control of a large number of enzymes, ion channels and other proteins by Ca(2+). Among the enzymes to be stimulated by the calmodulin-Ca(2+) complex are a number of protein kinases and phosphatases. High expression in stolon tips and stems, moderate in roots, and very low in leaves. Localized in the meristematic regions of the shoot and root tips, the tip of the developing tuber and the vascular zones of petiole and tuber. Not detected in mesophyll cells. Expression reduced during tuber development. 5-fold induction 30 min after touching. This protein has four functional calcium-binding sites. Belongs to the calmodulin family.