Location: Crops Pathology and Genetics ResearchTitle: Field evaluation of olive (Olea europaea) genotypes for resistance to Pseudomonas savastanoi pv savastanoi
|SALMAN, MAZEN - Palestine Technical University- Kadoorie|
|GREENHUT, RACHEL - Hi Fidelity Genetics|
|FERGUSON, LOUISE - University Of California, Davis|
Submitted to: Journal of Plant Pathology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 4/1/2020
Publication Date: 5/25/2020
Citation: Salman, M., Kluepfel, D.A., Greenhut, R., Preece, J.E., Ferguson, L. 2020. Field evaluation of olive (Olea europaea) genotypes for resistance to Pseudomonas savastanoi pv savastanoi. Journal of Plant Pathology. 102:663-670. https://doi.org/10.1007/s42161-020-00549-8.
Technical Abstract: Current commercial Olive (Olea europaea) cultivars are susceptible to olive knot disease caused by Pseudomonas savastanoi pv savastanoi. Here we report on the examination of the Olive germplasm collection maintained at the USDA-ARS National Clonal Germplasm Repository (NCGR) in Winters, California for genotypes resistant to P. s. pv savastanoi. Over a two year period we evaluated olive knot disease incidence on X00 trees which represents 140 unique accessions consisting of 120 named cultivars originating from the Mediterranean Basin, South America, and California, including several hybrids, and related subspecies, Olea europaea ssp. cuspidate. All genotypes were replicated in four blocks with trees in these blocks ranging in age from 6 to 35 years old. The disease index was higher in 2014 (43.5%) than that in 2013 (29.4%). The percentage of infection varied significantly (P < 0.05) between the different blocks in the study orchard. Genotypes Bouteillon, Toffahi of Syria, Tragolea and Azapa were the most susceptible to olive knot. Verdeal, Leccino, Ascolana Tenera and Manzanilla De Sevilla were the most resistant genotypes. No genotype was completely resistant to P. s. pv savastanoi.