Figure 1.

Peach yellow mosaic (PYM). (a) Symptoms in leaves and young fruits of peach trees cv. ‘O’Henry’. (b) Leaf phenotypes induced in GF-305 peach seedlings by the severe PLMVd variant y4. (c) Leaf phenotype induced in GF-305 peach seedlings by the mild/latent PLMVd variant y7. Notice that this variant, in contrast with the extended yellow phenotype induced by y4, causes no symptoms or (in some leaves) just small yellow sectors, in which the nucleotide substitution (U283) characteristic of y4 and strictly associated with PYM reappeared.