Abstract
In order to further elucidate the role of flavanols in graft formation and incompatibility problems in apricot, analytical and histological data were collected from graft combinations consisting of P. insititia cv. Montizo as rootstock and either the cultivar Luizet or Moniqui as scion. The latter is known for its exigent character and for incompatibility problems occurring with numerous rootstocks. However, no visible symptoms of incompatibility were found when this cultivar was grafted onto 'Montizo'. This observation is in line with the analytical results revealing only minor differences between compatible 'Luizet'/'Montizo' and potentially troublesome 'Moniqui'/'Montizo' combinations with respect to the flavanol patterns present at the union and rootstock level one year after grafting, even though clear quantitative and qualitative differences exist between the flavanol patterns of the two cultivars. Thus, after a transient, wound-induced phase of enhanced flavanol accumulation at the union site during graft formation, harmonious metabolic interactions prevail in both combinations investigated, suggesting 'Montizo' as a relatively good rootstock for the cultivar Moniqui.
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