ISHS Acta Horticulturae 314: II International Symposium on Propagation of Ornamental Plants
COMPONENTS OF 'BUD FAILURE' IN SUMMER BUDDED TREES |
| Authors: | B.H. Howard, W.B. Oakley, J. Vasek |
| Keywords: | Union formation, rootstock, scion |
| Abstract:
Acer platanoides 'Crimson King' and Betula pendula 'Dalecarlica' summer bud-grafted onto seedling rootstocks gave a lower 'bud-take' than Malus tschonoskii and Prunus 'Pink Perfection' budded onto clonal rootstocks. Poor 'bud-take' comprised both the inability of the scion and rootstock tissue to form a union, as illustrated by Acer, and also of the bud to grow after union formation, as illustrated by Betula. In Acer platanoides, grafts from the 'Crimson King' scion gave reduced union formation compared with a graft taken from the branch of a seedling rootstock and inserted in the stem of the same plant. This was not taken as evidence of genetic incompatibility among the genetically different seedling rootstocks because the level of apparent 'incompatibility' was affected by the part of the scion stem used for the graft, the nature of the tying material used to secure it, and the year of budding. These results are discussed in the context of researching the causes of poor bud-grafting performance in ornamental trees. | |
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