Synchronous flowering and pollen storage techniques as aids to artificial hybridization in pistachio (Pistaciaspp.)

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Abstract
Summary Synchrony of flowering in Pistacia spp. and cvs, which vary widely in flowering time, has been achieved by a combination of techniques, involving selection, chilling, and grafting of budwood onto 1-year-old rootstocks. Conditions for successful pollen storage from one season to the next, either at –196° C or under freeze-dried conditions are also reported. These techniques have been used to achieve artificial hybridization between plants which flower at different times under normal field conditions.