Potential calcium sensor that binds calcium in vitro. Expressed in the zones of elongation and differentiation in seedling roots and at the root-hypocotyl junction. Expressed from stage 12 of flower development in anthers, specifically in pollen. By salt and methyl jasmonate treatments, drought stress and infection by the bacterial pathogen P.syringae. Although assigned as a calmodulin family member by Ref.3, it only contains EF-hand domains.