Vitamin C (Ascorbic Acid) plays important roles in the growth and development of plants.Its metabolism and function had been studied in depth by Nicholas Smirnoff. Broadly the function of ascorbic acid in plants may be divided into four categories, i.e, i) antioxidant, ii) enzyme co-factor, iii) electron transport and iv) Oxalate and tartrate synthesis. Antioxidant function is relevant with photoprotection.