Behaviour of Vitis vinifera L. cv. Albariño plants, produced by propagation in vitro, when using single bud cuttings
Single bud cuttings were produced from cane taken from vines propagated in vitro which had been held for a year in pots. During this period we had observed, in the mother plants, that three areas appeared which showed a clearly different morphology. In the basal area the leaves were cordiform or pentagonal without sinuses, with high density of erect hairs, a low density or absence of horizontal hairs and a strong anthocyanic pigmentation. In the intermediate area the leaves were pentagonal, with deep sinuses, a high density of erect hairs and a strong anthocyanic pigmentation in the principal nerves. In the apical area the leaves were pentagonal, without sinuses, with a high density of horizontal hairs, total absence of erect hairs and absence of anthocyanic pigmentation in the principal nerves (typical of adult Albariño). The single bud cuttings were planted in pots and it was observed that during the first year all the plants, as much those taken from the basal area as those from the intermediate and apical areas, produced leaves having very deep sinuses (juvenile character). Three years more were allowed to pass, they were subjected to pruning as low down as possible on same year wood and then were restudied. It was seen that the vine produced from single bud cuttings taken from the basal area showed very juvenile characters, those taken from the intermediate area showed characters somewhere between the juvenile and adult stages, and those taken from the apical area showed adult characters.
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