The walnut (Juglans regia L.) is an important species cultivated worldwide for both fruit and its quality wood. There are very many biotypes that are studied in relation to pedoclimatic conditions and fruit quality to identify valuable genotypes. The present study aimed at the comparative evaluation of seven walnut genotypes (B501 - B507) based on the biometric parameters of fruits, the shape and size indices and the core quality indices (% of total fruit and biochemical indices). In terms of fruit size, genotypes B502 and B501 have been revealed with very large and large nuts. The fruit mass differentiated the studied genotypes and the B502 genotype had the highest values, while on the basis of the core mass parameter, the genotypes B502 and B506 were the ones with highest values. In terms of biochemical indices, B501 and B503 genotypes had the highest content of extraction protein - fat and B501 biotype had also the highest total carbohydrate content. Clustering analysis, based on Euclidean distances, has grouped the studied genotypes as statistically safe, Coph. corr. = 0.918. From PCA analysis, PC1 explained 94.692% and PC2 4.2127% of the existing variance between the genotypes in relation to the quality index, protein, carbohydrates and fats.
Iordanescu et al. (Mon,) studied this question.