FEEDBACK  |  CONTACT  |  SITE MAP  |  ABOUT US   
Ask an account
You are here : Home / Home URGI / Species / Venturia / Publications / Origin and colonization history

Publications

International,  ACL (papers with reading comittee)

Fungal Genetics and Biology 44: 284-292

01 Apr 2007   Origin and colonization history of newly virulent strains of the phytopathogenic fungus Venturia inaequalis

Guérin F, Gladieux P, and Le Cam B

Plant resistance based on a gene-for-gene relationship tends not to be durable because virulent strains can emerge through mutation and colonize formerly resistant cultivars over large areas. Our objective was to determine the origin and colonization history of newly virulent strains of the fungus Venturia inaequalis. Four hundred and eighty-one strains from seven multi-cultivar orchards within a 300 km wide area were collected from a cultivar carrying the overcome Vf-gene (Vfcv populations) and from non-Vf cultivars (nVfcv populations). Using 9 microsatellite loci, we showed that Vfcv populations were closely related though highly differentiated, indicating they have been recently founded following rare long distance dispersal events from a common origin. Assignment tests revealed that the Vfcv populations had not emerged from any of the nVfcv populations. Vfcv populations had a low diversity and were strongly differentiated from nVfcv populations several years after the first reported breakdown, suggesting reproductive isolation between the two populations.

Update: 09 May 2011
Creation date: 15 Sep 2010
PLATFORM   RESEARCH   PROJECTS   DATA   TOOLS   SPECIES   ABOUT US   FEEDBACK   CONTACT US   REGISTER   EDIT