May mediate regulated, targeted secretion of Golgi-derived vesicles during seedling development. translocate from cytosol to membrane in a calcium-dependent manner. A number of isoforms are produced. According to EST sequences. Expressed mainly in roots and flowers. Low in stems and bearly detectable in leaves. In germinating seedlings, expressed in root, hypocotyl and cotyledon epidermal cells. By day 4, expression expands in the root endodermis and throughout initiating lateral roots. As the seedling matures, expression in the hypocotyl and cotyledons decreases and by day 14, expression is restricted to creases between the shoot meristem and its lateral primordia. Up-regulated by heat shock stress. Down-regulated by cold, dehydration, and salt stresses. A pair of annexin repeats may form one binding site for calcium and phospholipid. Belongs to the annexin (TC 1.A.31.1) family.