Roghayeh Khoshamad - Department of Horticultural Sciences, Faculty of Agriculture and Natural Resources, Urmia University, Urmia, Iran
Hamid Hassanpour - Department of Horticultural Sciences, Faculty of Agriculture and Natural Resources, Urmia University, Urmia, Iran
Amir Rahimi - Department of Plant Production and Genetics, Faculty of Agriculture and Natural Resources, Urmia University, Urmia, Iran

Peel and pulp of grape (Vitis vinifera L.) berries contain a wide range of bioactive compounds that may be responsible for their biological activities. Phenolic compounds, antioxidant capacity and antioxidant enzymes of wild grape accessions from the West Azerbaijan province were investigated in different fractions of berries, i.e., peel and pulp fractions. The total phenol (TP) content ranged from ۱۳۹.۲۹-۸۴۳.۱۰ and ۱۵۱.۶۷-۴۱۶.۹۱ mg Gallic acid equivalent (GAE) per ۱۰۰ g in the peel and pulp, respectively. The highest level of antioxidant capacity and antioxidant enzymes activities (Catalase (CAT)and Superoxide dismutase (SOD)) in all the native accessions was observed in peel fraction. Also, principal component analysis (PCA) demonstrated that genotypic effect is more pronounced toward peel antioxidant activity based on ۲,۲-Diphenyl-۱-picrylhy (DPPH) assay and pulp total anthocyanin (TA) of grape berries. The present study displays the potential of native grape accessions studied for improvement of nutritional value through germplasm enhancement programs.

Catalase enzyme, Iran, Principal component analysis, total phenol