Calcium-binding protein that may positively regulate abscisic acid (ABA) inhibition of germination and seedling development. May be required for photoperiod-induced flowering and function in ion homeostasis. Expressed in seed coat, seedling radical, cotyledons, hypocotyl, shoot apex and elongating root. Expressed in the vasculature of cotyledons, leaves and roots. Highly expressed in guard cells, trichomes and hydathodes. Expressed in inflorescence stem branch points, silique abscission zone, young and mature styles and stigmatic papillae, mature anthers and developing seed. By rain-, wind-, and touch (thigmomorphogenesis), dark, heat and cold treatments, hydrogen peroxide, ABA and auxin. Although assigned as a calmodulin family member by Ref.9, it only contains EF-hand domains.