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Abstract
Phytophthora ramorum causes lethal canker diseases and extensive mortality in coast live oak (CLO) (
Quercus agrifolia) and tanoak (
Lithocarpus densiflorus). No practical controls are available for this disease in non-urban environments. Therefore, characterization of natural resistance is highly desirable. Variation in resistance to
P. ramorum has been observed in CLO in both naturally infected trees and controlled inoculation trials. The persistence of asymptomatic CLOs in naturally infested disease progression plots established in 2000 has been reported (McPherson and others 2005; McPherson and others, unpublished). Around a third of CLOs in a population directly inoculated with the pathogen failed to develop symptoms or appeared to recover following initial symptom development (McPherson, unpublished). Previous studies suggested that phloem phenolic chemistry may play a role in induced defense responses to
P. ramorum in CLO (Ockels and others 2007). However, in those studies, a relationship was not established between phenolic defense responses and actual resistance, and constitutive phenolic levels may also play a role in resistance, tolerance, or mitigation of initial infection.
Parent Publication
Citation
Nagle, Annemarie M.; Garbelotto, Matteo; McPherson, Brice; Wood, David L.; Bonello, Pierluigi. 2010. Relationship between resistance to
Phytophthora ramorum and constitutive phenolic chemistry in coast live oaks and northern red oaks. In: Frankel, Susan J.; Kliejunas, John T.; Palmieri, Katharine M. 2010. Proceedings of the Sudden Oak Death Fourth Science Symposium. Gen. Tech. Rep. PSW-GTR-229. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station. pp. 189-192
