+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Lineage, Temperature, and Host Species have Interacting Effects on Lesion Development in Phytophthora ramorum



Lineage, Temperature, and Host Species have Interacting Effects on Lesion Development in Phytophthora ramorum



Plant Disease 98(12): 1717-1727



There are four recognized clonal lineages of the pathogen Phytophthora ramorum. The two major lineages present in North America are NA1 and NA2. With a few exceptions, NA1 is found in natural forest ecosystems and nurseries, and NA2 is generally restricted to nurseries. Isolates from the NA1 and NA2 lineages were used to infect rhododendron, camellia, and California bay laurel in detached leaf assays to study the effects of lineage, temperature, and host on pathogenicity and host susceptibility. Isolates within both lineages were highly variable in their ability to form lesions on each host. There was also a tendency toward reduced lesion size in successive trials, suggesting degeneration of isolates over time. Temperature had a significant effect on lesion size, with a response that varied depending on the host and isolate. Phenotypic differences between lineages appear to be heavily influenced by the representation of isolates used, host, and temperature. The importance of temperature, host, and lineage are discussed with respect to disease management, as well as future range expansions and migrations of the pathogen.

Please choose payment method:






(PDF emailed within 0-6 h: $19.90)

Accession: 066446040

Download citation: RISBibTeXText

PMID: 30703894

DOI: 10.1094/pdis-02-14-0151-re


Related references

Development and Validation of Polymorphic Microsatellite Loci for the NA2 Lineage of Phytophthora ramorum from Whole Genome Sequence Data. Plant Disease 101(5): 666-673, 2017

Draft genome sequences of Phytophthora kernoviae and Phytophthora ramorum lineage EU2 from Scotland. Genomics Data 6: 193-194, 2015

Infectivity of Phytophthora ramorum on selected Ericaceous host species. Phytopathology 92(6 Suppl.): S81, 2002

Phytophthora ramorum: a pathogen with a remarkably wide host range causing sudden oak death on oaks and ramorum blight on woody ornamentals. Molecular Plant Pathology 9(6): 729-740, 2008

Susceptibility of Selected Ericaceous Ornamental Host Species to Phytophthora ramorum. Plant Disease 88(9): 993-999, 2004

Correlation of lesion size with percent lesion coverage on camellia and rhododendron leaves inoculated with Phytophthora ramorum. Phytopathology 96(6): S114-S115, 2006

Host Phenology and Leaf Effects on Susceptibility of California Bay Laurel to Phytophthora ramorum. Phytopathology 106(1): 47-55, 2016

Discovery of a fourth evolutionary lineage of Phytophthora ramorum: EU2. Fungal Biology 116(11): 1178-1191, 2012

Susceptibility to Phytophthora ramorum in a Key Infectious Host: Landscape Variation in Host Genotype, Host Phenotype, and Environmental Factors. New Phytologist 177(3): 756-766, 2008

Susceptibility to Phytophthora ramorum in a key infectious host: landscape variation in host genotype, host phenotype, and environmental factors. New Phytologist 177(3): 756-766, 2008

Temperature Effects on the Onset of Sporulation by Phytophthora ramorum on Rhododendron Cunningham's White. Journal of Phytopathology 163(11-12): 908-914, 2015

Change of Mating Type in an EU1 Lineage Isolate of Phytophthora ramorum. Journal of Phytopathology 162(1): 43-47, 2014

Geneenvironment tests discriminate the new Eu2 evolutionary lineage of Phytophthora ramorum and indicate that it is adaptively different. Forest Pathology 44(3): 219-232, 2014

First Report of the NA2 Lineage of Phytophthora ramorum from an Ornamental Rhododendron in the Interior of California. Plant Disease 98(6): 849, 2014

Challenges in predicting invasive reservoir hosts of emerging pathogens mapping Rhododendron ponticum as a foliar host for Phytophthora ramorum and Phytophthora kernoviae/. 2013