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
Citations
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Journal ArticleDOI
Phenotypic Characterization of Recent Clonal Lineages of Phytophthora infestans in the United States
TL;DR: An investigation into phenotypic traits associated with clonal lineages P. infestans responsible for the late blight epidemics in the northeastern region of the United States in the summers of 2009 and 2010 found that US-8 and US-24 were primarily pathogenic on potato while US-22 andUS-23 were pathogenicon both potato and tomato.
Journal ArticleDOI
SGT1 positively regulates the process of plant cell death during both compatible and incompatible plant-pathogen interactions
Keri Wang,Srinivasa Rao Uppalapati,Xiaohong Zhu,Savithramma P. Dinesh-Kumar,Kirankumar S. Mysore +4 more
TL;DR: Using virus-induced gene silencing (VIGS) in Nicotiana benthamiana, it is demonstrated that SGT1 positively regulates the process of cell death during both host and nonhost interactions with various pathovars of Pseudomonas syringae, and NbSGT1 is an essential component affecting the process in both compatible and incompatible plant-pathogen interactions.
Functional genomics of Phytophthora infestans effectors and Solanum resistance genes
TL;DR: This thesis employs effectoromics, i.e. the use of effectors (pathogenic secreted protein) to probe corresponding R gene(s) in a host plant and sort out their functional redundancy and specificity, to provide a technical solution for long-term disease management of late blight.
Journal ArticleDOI
A quantitative real-time PCR method for in planta monitoring of Phytophthora infestans growth.
Briardo Llorente,Fernando Bravo-Almonacid,Fernando Bravo-Almonacid,Cristina Cvitanich,Elżbieta Orłowska,Héctor N. Torres,Héctor N. Torres,Mirtha M. Flawiá,Mirtha M. Flawiá,Guillermo D. Alonso,Guillermo D. Alonso +10 more
TL;DR: A reliable and rapid protocol to simultaneously obtain high quality DNA from an infected host plant and the infecting pathogen is established to develop an accurate and sensitive low‐cost assay for the quantification and in planta monitoring of Phytophthora infestans growth.
Journal ArticleDOI
Phytophthora foliorum sp. nov., a new species causing leaf blight of azalea.
Ryan S. Donahoo,Cheryl L. Blomquist,Samantha L. Thomas,John K. Moulton,David E. L. Cooke,Kurt Lamour +5 more
TL;DR: This paper presents the formal description of P. foliorum as a new species and underscores the need for caution when relying solely on DNA-based diagnostic tools.
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