Page Banner

United States Department of Agriculture

Agricultural Research Service

Research Project: Evaluation of Cotoneaster spp.: Landscape Performance, Fire Blight Resistance, and Ploidy Levels

Location: Floral and Nursery Plants Research

Project Number: 8020-21000-147-03-S
Project Type: Non-Assistance Cooperative Agreement

Start Date: Sep 1, 2013
End Date: Sep 30, 2015

To 1) screen a comprehensive germplasm collection of cotoneaster for fire blight resistance, 2) establish relative ploidy level and chromosome counts for poorly described tax, and 3) conduct a field evaluation for characterizing landscape performance using GRIN descriptors for ornamental taxa. This germplasm and data will be used by breeders and nurserymen to make novel hybrids combining disease resistance, ornamental traits, and noninvasiveness.

The Oregon State University (OSU) cotoneaster collection, augmented with supplemental collections, will be screened for fire blight resistance using controlled inoculations with a common virulent strain from Oregon. Ploidy levels will be determined via flow cytometry, and relative ploidy levels confirmed using chromosome counts as necessary. Field evaluations will based on replicated plantings, and include fireblight incidence, overall performance, and GRIN descriptors for ornamental traits. Upon completion of the studies, representative samples and GRIN data will be deposited at the Woody Landscape Plant Germplasm Repository long term conservation and distribution. Herbarium vouchers will be collected and deposited at the OSU and the National Arboretum herbaria.

Last Modified: 06/22/2017
Footer Content Back to Top of Page