Potential calcium sensor that binds calcium in vitro. Binds to ABCG36. Expressed in cotyledons and guard cells of young leaves. In mature root, expressed in the epidermis, trichoblasts, young lateral root and root tip. Expressed from stage 9 to 15 of flower development in anther wall. By touch, salt and hydrogen peroxide treatments, drought stress, wounding, dark and infection by the bacterial pathogen P.syringae. Although assigned as a calmodulin family member by Ref.5, it only contains EF-hand domains.