Limited Genetic Diversity in North American Isolates of Phytophthora erythroseptica Pathogenic to Potato Based on RAPD Analysis.

  title={Limited Genetic Diversity in North American Isolates of Phytophthora erythroseptica Pathogenic to Potato Based on RAPD Analysis.},
  author={Rick D. Peters and Rod Clark and Albert D Coffin and Antony V. Sturz and David H. Lambert and Jeffery S. Miller},
  journal={Plant disease},
  volume={89 4},
Pink rot of potato (Solanum tuberosum), caused by Phytophthora erythroseptica, is found wherever potatoes are grown, and in the last decade, it has reemerged as an economically important disease in Canada and the United States. A selection of isolates of P. erythroseptica from major potato-growing regions in North America, namely Prince Edward Island and New Brunswick, Canada, and Maine and Idaho, U.S.A., was assessed for genetic diversity with randomly chosen decanucleotide primers which were… 

Genetic diversity in Phytophthora capsici from eastern China

Variation was found in the virulence assays based on pathogenicity to a set of nine pepper cultivar differentials, where the strains from eastern China grouped into seven pathotypes and no correlation was found between groups identified by RAPD analysis and pathotype groups defined by virulence.

Analysis of Genetic Diversity in Phytophthora colocasiae using RAPD Markers

Leaf blight disease caused by Phytophthora colocasiae is one of the major production constraints in taro (Colocasia esculenta). A total of 12 P. colocasiae isolates isolated from blighted taro

Identification and detection of Phytophthora erythroseptica and its hybrids using specific primers.

Specific primers designed in this study were able to detect P. erythroseptica as the maternal or paternal parent species in hybrid isolates that would make a significant help to recognize one of the parental species in hybrids of P.

Methodology and Assessment of the Susceptibility of Potato Genotypes to Phytophthora erythroseptica, Causal Organism of Pink Rot

Three years of trials with 17 cultivars and 2-year trials with an additional six cultivars indicate that, while results are significantly correlated, detached tuber evaluations do not sufficiently differentiate those potato lines found most resistant under field conditions.

Prevalence of Mefenoxam Resistance Among Phytophthora erythroseptica Pethybridge Isolates in Minnesota and North Dakota

The presence of P. erythroseptica isolates with intermediate levels of resistance to mefenoxam collected in Minnesota support earlier studies which indicate that isolates displaying intermediate responses to meenoxam are indicative of a transitional flux from a me Fenoxam-sensitive to a mefen Oxam-resistant population.

In vitro somatic growth and reproduction of phenylamide-resistant and -sensitive isolates of Phytophthora erythroseptica from infected potato tubers in Idaho

Sexual reproduction of MR isolates in nature may be greater than MS isolates, butMS isolates may be more asexually fit based on the fitness parameters studied.

Biological Significance of Mefenoxam Resistance in Phytophthora erythroseptica and Its Implications for the Management of Pink Rot of Potato.

The results suggest that pink rot may become more severe in fields known to contain P. erythroseptica populations with mefenoxam EC50 values >1.0 μg ml-1 if the fungicide is applied.

Genetic variability of Phytophthora sojae isolates from Argentina.

RAPD analysis detected intraspecific variability even among isolates of the same geographic origin, indicating high variability in Phytophthora sojae isolates from Argentina.

Bacterial Antagonists, Zoospore Inoculum Retention Time and Potato Cultivar Influence Pink Rot Disease Development

Significantly, zoospore inoculum of the pathogen incited smaller lesions in the early stages of individual bioassay experiments than occurred later in bioassays when most zoospores had encysted.

Origins of the blemishes of potato tubers : from the soil microbiology to the pedoclimatic environment

A path was opened toward the resolution of the issue asked by all the potato community, responsible for the marketing of a mass consumption fresh product and answering to market requirements related to visual and culinary qualities and to environmental friendly modes of production.



Sensitivity of North American Isolates of Phytophthora erythroseptica and Pythium ultimum to Mefenoxam (Metalaxyl).

Observations suggest that pink rot and leak could become significant problems in the future, particularly in those areas where resistance has been detected, and monitoring the sensitivity of the pathogen population to mefenoxam in all production areas should be considered and integrated as a part of the overall disease management strategy.

Tuber response of six potato cultivars to inoculation with Phytophthora erythroseptica, the causal agent of pink rot

Information on differences in the tolerance of potato cultivars to pink rot may influence the choice of cultivars grown in fields that are poorly drained or with a history of the disease.

Metalaxyl sensitivity of isolates of Phytophthora erythroseptica in Prince Edward Island

Inoculation of potato tubers from plants treated with foliar applications of metalaxyl in the field indicated that compounds inhibitory toMetalaxyl-sensitive isolates of P. erythroseptica were present in the periderm, even after 4 months' storage, which will be critical in maintaining metalAXyl as an effective chemical for control of this pathogen.

Widespread distribution and probable origin of resistance to metalaxyl in clonal genotypes of Phytophthora infestans in the United States and Western Canada

Evidence for selection of metalaxyl-resistant mutants within clonal lineages was detected among the limited sample of isolates from Europe and Israel, and strongly supports the hypothesis that resistance in the United States and Canada originated by migration, rather than by mutation and selection after migration.

Changes in race structure of Canadian populations ofPhytophthora infestans based on specific virulence to selected potato clones

Virulence genes which overcame host resistance conferred by R8 were the rarest in the populations studied and implies that the introduction of cultivars with specific R genes for resistance would be an ineffective control measure.

Analysis of pathogenicity and genetic variation among Phytophthora sojae isolates using RAPD

Fifty-five Phytophthora sojae isolates were collected from soil samples and diseased soybean plants from Illinois, Indiana, Iowa, and Minnesota in 1994 and 1995 and a dendrogram depicting the relatedness of the isolates was constructed using UPGMA.


A comparison of allozyme banding patterns at two loci, for glucose-6-phosphate isomerase (Gpi) and peptidase (Pep), with markers for mating type, metalaxyl sensitivity, and cultural morphology

Assessment of Resistance of Tubers of Potato Cultivars to Phytophthora erythroseptica and Pythium ultimum.

Cultivar susceptibility should be considered when making disease management decisions, particularly in fields where these soilborne diseases are a recurring problem.

Panglobal distribution of a single clonal lineage of the Irish potato famine fungus.

The genetic data are consistent with the hypothesis that the initial migration of P. infestans in the 1840s was from Mexico to the United States and that only a single genetic individual was transported to Europe and subsequently to the rest of the world.

Evidence of gene flow between pea and bean pathotypes of Aphanomyces euteiches.

The results suggest that this diploid homothallic oomycete is capable of outcrossing and that sexual reproduction may play an important role in the generation of phenotypic variation.