ISHS Acta Horticulturae 224: Fruit Breeding
JUVENILE PERIOD OF APPLE SEEDLINGS AS AFFECTED BY ROOTSTOCK, BUD ORIGIN AND GROWTH FACTORS. |
| Authors: | J.J. Verhaegh, T. Visser, M. Kellerhals |
| Abstract:
The effect of the rootstock M27 on the juvenile period (JP) of apple seedlings was not large; it became smaller or even negligeable as the inherent JP of the population was shorter. Using lateral compared to apical buds for propagation clearly lengthened the JP; interference with the growth of the young seedlings e.g. due to heavy topping did likewise. Seedlings with the thicker stems in the nursery tended to have a shorter JP than the category with the thinner stems. Pre-selection on this basis is possible. Apple seedlings of the same populations on their own roots and on a rootstock performed similarly in The Netherlands and Switzerland, presumably because of similar growing conditions. If these conditions are optimal and the above average seedlings only are pre-selected, the laboriez procedure of propagation on a rootstock offers no advantage. | |
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