Özet:

Chestnut is one of the important fruit species for commercially to grown with its nut, flower, leaf and timber in Turkey and all over the world. There is a dense natural chestnuts population in Beykoz, Istanbul. There are many genotypes in the natural forest areas of the Dereseki region in the district. In this study, agromorphological characteristics of chestnuts genotypes were determined in Istanbul Beykoz region. In the study, 10 genotypes were determined from chestnut genotypes in the region as promising. Nut weight varied between 6.6-12.4 g, width 23.42-31.56 mm, length 12.36-20.22 mm and height 23.11-30.34 mm in promising genotypes. It was determined that the nut pericarp of 7 genotypes is soft, the seed coat is easily peeled and the seed coat does not penetrate into the seed mostly, and it has been concluded that promising genotypes can form a basis for future breeding studies.