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
GK4, a G-protein-coupled receptor with a phosphatidylinositol phosphate kinase domain in Phytophthora infestans, is involved in sporangia development and virulence.
TL;DR: Silencing of GK4 and overexpression of full‐length and truncated constructs in P. infestans revealed that PiGK4 is not only involved in spore germination and hyphal elongation but also in sporangia cleavage and infection.
Journal ArticleDOI
The influences of Cr-tolerant rhizobacteria in phytoremediation and attenuation of Cr (VI) stress in agronomic sunflower (Helianthus annuus L.)
Ali Bahadur,Ali Bahadur,Rizwan Ahmad,Aftab Afzal,Huyuan Feng,Vishandas Suthar,Asfa Batool,Aman Khan,M. Mahmood-ul-Hassan +8 more
TL;DR: An assessment about Cr-tolerant bacteria and their influences is illustrated and it is recommended that these bacteria can effectively be used for crop improvement which provides a potential approach for Cr phytoremediation.
Journal ArticleDOI
Identification and Characterization of Isolates of Phytophthora infestans Using Fatty Acid Methyl Ester (FAME) Profiles.
Robert P. Larkin,Carol L. Groves +1 more
TL;DR: Fatty acid profiles can be an additional tool useful for characterizing isolates and populations of P. infestans, and individual isolate characteristics were more determinant than genotype group characteristics, although genotype could be determined for most isolates tested.
Journal ArticleDOI
Albugo-imposed changes to tryptophan-derived antimicrobial metabolite biosynthesis may contribute to suppression of non-host resistance to Phytophthora infestans in Arabidopsis thaliana.
David C. Prince,David C. Prince,Ghanasyam Rallapalli,Ghanasyam Rallapalli,Deyang Xu,Henk-jan Schoonbeek,Volkan Cevik,Volkan Cevik,Shuta Asai,Eric Kemen,Eric Kemen,Neftaly Cruz-Mireles,Ariane Kemen,Ariane Kemen,Khaoula Belhaj,Sebastian Schornack,Sebastian Schornack,Sophien Kamoun,Eric B. Holub,Barbara Ann Halkier,Jonathan D. G. Jones +20 more
TL;DR: This work has revealed that two species of Albugo upregulate genes associated with tryptophan-derived antimicrobial metabolites in Arabidopsis and contribute to suppression of non-host resistance to P. infestans.
Journal ArticleDOI
Genetic diversity of Phytophthora colocasiae isolates in India based on AFLP analysis
Vishnu Sukumari Nath,Muthukrishnan Senthil,Vinayaka Hegde,M. L. Jeeva,Raj Shekhar Misra,S S Veena,Mithun Raj +6 more
TL;DR: A high level of genetic variation among the isolates irrespective of the geographical origin is displayed and the possible mechanisms and implications of this genetic variation are discussed.
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