Staff Publications

Staff Publications

  • external user (warningwarning)
  • Log in as
  • language uk
  • About

    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

    We have a manual that explains all the features 

Record number 437515
Title Characterisation of Phytophthora infestans Isolates Collected from Potato and Tomato Crops in Tunisia During 2006–2008
Author(s) Harbaoui, K.; Lee, T.A.J. van der; Vleeshouwers, V.G.A.A.; Khammassy, N.; Harrabi, M.; Hamada, W.
Source Potato Research 56 (2013)1. - ISSN 0014-3065 - p. 11 - 29.
DOI https://doi.org/10.1007/s11540-012-9228-3
Department(s) Bioint Moleculair Phytopathology
Plant Breeding
Publication type Refereed Article in a scientific journal
Publication year 2013
Keyword(s) genotypic diversity - united-states - mating-type - northwestern washington - genetic-structure - populations - resistance - metalaxyl - migration - canada
Abstract Severe late blight epidemics in Tunisia in recent years prompted population studies on the pathogen responsible for this disease, Phythophthora infestans. Characterisation of 165 Tunisian P. infestans isolates collected from 2006 to 2008 was performed for the mating type and mt haplotype, while subsets were analysed for metalaxyl sensitivity (n¿=¿65), virulence on differential set of 11 R genes of Solanum demissum (n¿=¿31), aggressiveness on cv. Bintje (n¿=¿36) and measurement of the radial growth on agar medium at three temperatures (n¿=¿38). Most isolates from potato and all isolates from tomato had the A1 mating type. The A2 mating type was detected in the north-east and northern areas, but not in the north-west. All the A2 mating type isolates were metalaxyl resistant and seem to be part of a new generation of the P. infestans isolates which are more aggressive, with more complex races, and tolerant to higher temperatures. The increased severity of epidemics during 2006 to 2008 can be attributed to favourable weather conditions during growing seasons, adaptation of new genotypes, widespread phenylamide resistance in potato production regions and most probably incorrect spray programmes. In contrast to the presence of complex pathotypes in two major potato crop regions (north-east and northern areas), the P. infestans population detected in the other regions and in tomato crops was still relatively simple. Compared with the situation in Europe and the American continent, or even compared with neighbouring countries such as Algeria, the genetic changes in Tunisia are still comforting and require strict management decision on late blight control to avoid the spread of new P. infestans populations from Europe or neighbouring countries
Comments
There are no comments yet. You can post the first one!
Post a comment
 
Please log in to use this service. Login as Wageningen University & Research user or guest user in upper right hand corner of this page.