1Departement of Horticulture, Faculty of Agriculture, Miyaneh Branch, Islamic Azad University, Miyaneh, Iran
2Department of Horticulture, Medicinal Plants and Organic Products Research Center, Miyaneh Branch, Islamic Azad University, Miyaneh, Iran
3Department of Agronomy and Plant Breeding, Faculty of Agriculture, Shahed University, Tehran, Iran
4Medicinal Plants Research Center, Shahed University, Tehran, Iran
5Deparment of Agronomy and Plant Breeding, Miyaneh Branch, Islamic Azad University, Miyaneh, Iran
6Medicinal Plant Research Center, Institute of Medicinal Plants, ACECR, Karaj, Iran
Due to the nutritional and pharmaceutical importance of hazelnut (Corylus avellana L.), the morphophysiological and phytochemical diversity of 15 Iranian hazelnut populations with two commercial cultivars were studied. The genotypes had significant differences in morphophysiological and phytochemical characteristics. The significant variance among genotypes (p<0.01) and high genetic variance (σ2g) indicated the diversity in most traits. The highest coefficient of genetic changes was related to the percentage of fruit kernel, kernel width, calcium, phosphorus, total phenol and taxol. The main components did not correspond to different traits. Mantel test showed that the correlation between the groupings based on morphological traits and climatic variability was 0.67%, while it was 0.51% for the phytochemical traits and 0.41% for taxol. The significant diversity among hazelnut genotypes and also the mismatch with climatic diversity indicated the role of genetic factors on traits, which can be used in future breeding programs to produce superior hazelnut cultivars.