High frequency of sprouting from axillary buds was observed during summer in all four cultivars
in field and in vitro conditions. In the China White cultivar, sprouting was asynchronous and at the
end of 60 days only 23.3% of the nodal cuttings established into plants in summer in field
conditions. Under in vitro conditions, a high frequency of sprouting was induced in M-5 and S-36
cultivars on medium supplemented with 1.36 mM 2,4-D. In the S-13 cultivar, the axillary buds
collected during summer sprouted with the same frequency of 73.3% on medium supplemented