Genetic analysis of Phytophthora infestans

Research output: Thesisinternal PhD, WU

Abstract

In potato the resistance toPhytophthorainfestans , the causal agent of potato late blight, is often race specific and the presence of many different races of P.infestans in field populations hampers effective use of these resistance genes in agriculture. To understand the occurrence of different races, the inheritance of (a)virulence in P.infestans was studied in a cross between two Dutch field isolates. A genetic linkage map was constructed using AFLP markers and theavirulencegenes Avr1 , Avr2 , Avr3 , Avr4 , Avr10 and Avr11 were positioned on this map. As expected from the gene-for-gene model,avirulencewas shown to be dominant. Avr3 , Avr10 and Avr11 cluster on linkage group VIII and a deletion in this region is associated with virulence on potato plants carrying the corresponding R3, R10 and R11 resistance gene. This deletion was also found in a large percentage of Dutch field isolates of P.infestans and correlates with virulence on potato plants carrying R3, R10 or R11. Further analysis of the high-density genetic linkage maps constructed for P.infestans revealed the presence ofhemizygousregions, translocations andtrisomicprogeny. Together these show the genetic flexibility of this notorious pathogen.
Original languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
  • Wageningen University
Supervisors/Advisors
  • de Wit, Pierre, Promotor
  • Govers, Francine, Co-promotor
Award date3 Oct 2003
Place of Publication[S.I.]
Publisher
Print ISBNs9789058089397
Publication statusPublished - 2003

Keywords

  • solanum tuberosum
  • potatoes
  • phytophthora infestans
  • plant pathogenic fungi
  • molecular genetics

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