FIELD EVALUATION OF JUGLANS REGIA SELECTED CLONES FROM SEEDLING POPULATIONS OF MEDITERRANEAN AND ATLANTIC SPANISH COAST.
We have studied the main characteristics of the pre-selected material, 40 clones from the Mediterranean coast and 32 from the Atlantic coast. Isoenzymatic characterization, using four systems (MDH, PGM, SDH and 6PGD), showed the same five variable loci but their allele frequency is different. Vegetative and agronomic features showed some remarkable differences. Budbreak occurs earlier in the Mediterranean coast trees than in those from the Atlantic coast. Spread growth habit is more common in the Atlantic origin and the vigor looks like to be higher in seedling trees from the Mediterranean area. This last feature seems to be related to the plant material origin. The Atlantic coast clones have a high proportion of trees showing intermediate flowering (as ‘Hartley’) and this material is more tolerant to blight than that from Mediterranean area, mainly on leaves.