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ARS Home » Pacific West Area » Corvallis, Oregon » National Clonal Germplasm Repository » Research » Research Project #434737

Research Project: Interstem Grafts to Evaluate Pear Germplasm for Dwarf Potential

Location: National Clonal Germplasm Repository

Project Number: 2072-21000-049-07-T
Project Type: Trust Fund Cooperative Agreement

Start Date: May 1, 2017
End Date: Jun 30, 2019

1. Examine whether interstem grafts can be used to identify pear selections that have dwarfing potential. 2. Provide a rapid assay for screening pear germplasm for prospective rootstock candidates.

Approximately 40 pear selections will be evaluated for dwarfing potential by using them as interstems, grafted onto Bartlett seedling rootstocks. Some of these selections are known to be either dwarfing or vigorous when scions are grafted onto them directly. Scion cultivars Bartlett and Bose will be simultaneously grafted onto the interstem pieces. Grafted trees will be grown in pots for the first growing season. Vegetative growth of cultivar scions (stem diameter and height) will be evaluated at the end of the first growing season. Trees will be planted in a replicated field trial for another year.