effect of some citrus rootstocks on the amount of biochemical composition of parson brown and mars oranges in jiroft

citrus fruits contain numerous nutrients and secondary metabolites including sugars, vitamin c, flavonoids and phenols which have high antioxidant activity and nutritional value. factors such as cultivar, type of stock and fruit position affect the amount of these compounds. hence in this study the amount of sucrose, glucose, total sugar, vitamin c, flavonoids and phenols in pulp, mesocarp and flavedo of parson brown and mars oranges grafted on citrange, cleopatra and rough lemon stocks were measured. according to the results, maximum of vitamin c was in parson brown cultivar on the citrange and cleopatra grafting stocks. the highest total sugar was recorded in parson brown and mars cultivars on the rough lemon stock (p<0.01), respectively. the highest glucose was in mars cultivar on the rough lemon stock (p<0.01). parson brown on rough lemon stock had highest sucrose levels. the lowest of sucrose and glucose level was in the parson brown that grafting on cleopatra stock (p <0.01). the results show that, the highest phenol (28.84 mg/g) and flavonoids (22.57 mg/g) were in the flavedo of mars cultivar on the rough lemon grafting stock. the results of correlation show that between the amount of flavonoid and phenols exist positive and significant correlation (p<0.01).