ISHS Acta Horticulturae 451: VI International Symposium on Integrated Canopy, Rootstock, Environmental Physiology in Orchard Systems
ROOTSTOCK BREEDING AND ORCHARD TESTING AT HORTICULTURE RESEARCH INTERNATIONAL - EAST MALLING |
| Authors: | A. D. Webster, K. R. Tobutt, David J. James, Kate M. Evans, Frank A. Alston |
| Keywords: | Apple, pear, sweet cherry, plum, quince |
| Abstract:
Several new apple rootstock clones produced by the breeding program at Horticulture Research International-East Malling have shown promise in preliminary orchard trials. Two of these, AR 86–1–20 and AR 86–1–25, have similar vigor and performance to MM.106, but with the additional advantage of much improved resistance to collar (crown) rot disease. Several other apple rootstock selections showing potential are in the vigor range between M.27 and M.26, and several of these have improved yield efficiency and/or fruit quality when compared with currently used commercial rootstocks in the same size range. A new HRI-East Malling quince rootstock, QR 193–16, has similar vigor to Quince C, but induces larger fruit size in the scion. Other more dwarfing quince clones are undergoing further trialing. Clones of Pyrus communis are also under test as rootstocks for pears and selections originating from a cross between BP.1 and Old Home (the 708 Series) are showing some dwarfing potential coupled with ease of propagation. A hexaploid clone of the sweet cherry rootstock Colt, produced by in vitro techniques, is 30% more dwarfing than conventional triploid Colt and induces similar yield efficiency. | |
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