UDP-glucose pyrophosphorylase is a common plant enzyme and plays a key role in many processes connected with carbohydrates metabolism in plant tissues. This enzyme catalyse the reversible reaction of synthesis/degradation of UDP-glucose and inorganic pyrophosphate from glucose-1-phosphate and UTP. UDP-glucose is the precursor of many carbohydrates like sucrose, starch, pectin, cellulose. The second product of UGPase activity is PPi, the alternative to ATP energy donor which supply Pi. The highest activity of UGPase was observed in cytosol.