Phenolic Compounds and Antioxidant Acttivity of some Asian Pear (Pyrus serotina Rehd.) Cultivars Under Tehran Climatic Conditions

Phenolic compounds are very considerable due to their important role in plant physiology and nutrition (antioxidant role). The amount of phenolic compounds are influenced by genotype and environmental conditions. In the present research، total phenol، antioxidant activity and some phenolic compounds including chlorogenic acid، catechin and pheloredzin of three Asian pear cultivars (KS6، KS9 and KS13) were studied. Investigated cultivars were 11 years old and had been budded on seedling of European pear (Pyrus communis L.) rootstocks with a density of 5000 trees per hectare based on randomized complete block design. Results showed that all studied cultivars differed significantly for all measured phenolic compounds except for pheloredzin content. Cultivar KS6 had the highest amount of chlorogenic acid and catechin. The regression analysis of total phenol and IC50 showed a positive correlation between the amount of total phenol and IC50. The highest amount of IC50 and total phenol was observed in KS13 and KS9، respectively.