Abstract
Clonal propagation of pistachio rootstocks (e.g. UCB-1) from cuttings will permit nursery production of cloned rootstocks and encourage selection of superior rootstock genotypes rather than the genetically variable seedling rootstocks currently produced. UCB-1 was propagated from leafy cuttings using five pruned mature seedling-derived trees for 2 years. Three shoot lengths, three cutting positions and three indole butyric acid (IBA) concentrations were tested. Significant rooting ability differences were found among genotypes (trees), cutting positions, and collection year, but not for shoot lengths and IBA concentrations. All these factors except genotype may be controlled during nursery production. Care must be taken to select genotypes with good propagation potential for evaluation and production. Rooting percentages greater than 40% may be obtained from selected UCB-1 trees. Therefore, clonal production of rootstocks is practical and provides the opportunity for the development of superior genotypes.
Published Version
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