The increase of cytoplasmic free Ca2+ ([ Ca2+]i) is involved in the signaling network triggered by some stimuli such as biotic and abiotic stress and phytohormones as well.

• 植物受到生物和非生物胁迫以及激素刺激时，胞质游离钙离子浓度([Ca~(2+)]_i)升高。