Effects of Extracellular ATP on Operation of Photosystem Ⅱ and Allocation of Absorbed Light of Bean Leaves under Low Temperature Effects of extracellular ATP on the characteristics of photochemical reaction in bean (Phaseolus vulgaris) leaves under different light intensities Effects of extracellular ATP and salicylic acid on photosynthetic index of tobacco Recent Progress in Understanding Extracellular ATP Signal Molecule in Plants Extracellular Adenosine Triphosphate Functions Downstream of Hydrogen Sulfide in Ethylene-induced Stomatal Closure in Arabidopsis thaliana