Transcription activator that binds to the DNA consensus sequence 5'-[ACG]CGCG[GTC]-3' (By similarity). Regulates transcriptional activity in response to calcium signals (Probable). Binds calmodulin in a calcium-dependent manner (By similarity). Involved together with CAMTA2 and CAMTA3 in the positive regulation of a general stress response (PubMed:25039701). Expressed in roots, stems, leaves, flowers and siliques. By heat shock, UVB, salt, wounding, ethylene, methyl jasmonate, abscisic acid, H(2)O(2) and salicylic acid (PubMed:12218065). Induced by cold stress (PubMed:28351986). Belongs to the CAMTA family.