cis-Zeatin Riboside-5‘-monophosphate Disodium Salt can be used in biological study of effect of light on growth and endogenous hormones in Chlorella minutissima (Trebouxiophyceae). Light effect on growth and endogenous hormones in microalgae. It can also be utilized for biological study of seasonal fluctuation of organic and inorganic components in xylem sap of Populus nigra. Components such as calcium, potassium, glucose and proteins in xylem sap of Populus nigra show seasonal fluctuations from winter to spring with abundance of abscisic acid throughout all seasons.