Journal ArticleDOI
Spontaneous variability of single isolates of Phytophthora infestans. II. Pathogenic variation
TLDR
In this paper, the variation in two aspects of pathogenicity, aggressiveness and virulence (physiologic race), among single zoospore cultures from three wild isolates has been examined.Abstract:
The variation in two aspects of pathogenicity, aggressiveness and virulence (physiologic race), among single zoospore cultures from three wild isolates has been examined. Two components of aggressiveness were measured, rate of growth on tubers and generation time on detached leaflets. Virulence was assessed from the pattern of compatible and incompatible reactions to members of the R gene differential series. Extensive variation in aggressiveness was detected in samples of zoospore cultures from all three isolates. The level of aggressiveness ranged from a high, equivalent to that of the parental wild isolates, to a complete lack of pathogenicity; as much as 45% was of the latter type. No instance of a change in virulence was found among 104 cultures tested.The significance of the observed pathogenic variation is discussed. It is concluded that zoospore variation is not important as a source of new physiologic races or strains adapted to particular, horizontally resistant varieties. Comparison of populati...read more
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Journal ArticleDOI
The pipg1 gene of the oomycete Phytophthora infestans encodes a fungal-like endopolygalacturonase.
TL;DR: In this paper, the first endopolygalacturonases (endoPGs) sequence from oomycetes, a unique group of eukaryotic plant pathogens that exhibit fungal-like filamentous growth but share little taxonomic affinity to fungi.
Journal ArticleDOI
The Transcriptome of Compatible and Incompatible Interactions of Potato (Solanum tuberosum) with Phytophthora infestans Revealed by DeepSAGE Analysis
Gabor Gyetvai,Mads Sønderkær,Ulrike Göbel,Rico Basekow,Agim Ballvora,Maren Imhoff,Birgit Kersten,Kåre Lehmann Nielsen,Christiane Gebhardt +8 more
TL;DR: The authors' DeepSAGE transcriptome analysis uncovered novel candidate genes for plant host pathogen interactions, examples of which are discussed with respect to possible function.
Journal ArticleDOI
Green fluorescent protein (GFP) as a reporter gene for the plant pathogenic oomycete Phytophthora palmivora
Pieter van West,Brian Reid,Tracey A. Campbell,Robert W. Sandrock,William E. Fry,Sophien Kamoun,Neil A. R. Gow +6 more
TL;DR: GFP and GUS can be used successfully as reporter genes in P. palmivora and for high magnification microscopic studies, GFP is better visualised and was superior to GUS, while for macroscopic examination, GUS was superior.
Journal ArticleDOI
Hierarchical Analysis of Diversity, Selfing, and Genetic Differentiation in Populations of the Oomycete Aphanomyces euteiches
TL;DR: Populations of A. euteiches were significantly differentiated at the soil sample, field, and regional level, and the population structure appears to be patterned by regular selfing via oospores, a mixed reproductive system including both asexual and sexual reproduction.
Journal ArticleDOI
Intra-racial variation in Phytophthora infestans and adaptation to field resistance for potato blight
TL;DR: Strains of Phytophthora infestans of the same race (P4) isolated from a range of R0 potato varieties differed markedly in their rate of growth on agar but differences in growth rate were not related to variety of origin.
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