Rootstockscion Compatibility

For a rootstock to be used, it must be graft compatible with the scion cultivar. Graft compatability is demonstrated as a successful union of rootstock and scion and is typified by flow of assimilates between the two parts, continued growth of the vascular transport tissues, and growth therefore of the whole plant. Generally, plants within a species are considered graft compatible, although there are incidences, albeit infrequent, of graft incompatibility between a root-stock and scion of the same species. Within some genera, there is widespread graft compatibility (e.g., Prunus). Thus, for crops such as peach, cherry, apricot, and almond, rootstocks may be a species other than the scion cultivar or may be hybrids among species. Compatibility may be even wider and occur among closely related genera within a family. For example, some graft compatibility for rootstocks has been demonstrated between pear (Pyrus) species, between pear and quince (Cydonia), and between pear and other Rosaceae genera.

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