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Virulence and molecular diversity within Ascochyta rabiei in Moroccan population and evaluation of genotypic stability on chickpea

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Title Virulence and molecular diversity within Ascochyta rabiei in Moroccan population and evaluation of genotypic stability on chickpea
 
Creator Bencheqroun, Sanae Krimi
 
Contributor Udupa, Sripada M.
Hamwieh, Aladdin
Kemal, Seid Ahmed
 
Description Ascochyta blight (Ascochyta rabiei Lab.) is an economically important fungal disease on chickpea in
Morocco, and in other parts of the world. Significant progress has been made in breeding chickpea for
Ascochyta blight resistance in Morocco, but the plant resistance is typically overcome by the evolution
of virulent pathotypes of the pathogen. In this study pathogenic variability among a population of A.
rabiei isolates, collected from four different chickpea growing regions in Morocco (Doukkala-Abda,
Chaouia, Gharb and Saiss), was assessed by screening over a set of chickpea differential genotypes. On
the basis of the pathogenicity test, the isolates were classified into three pathotypes groups. The most
aggressive pathotype (PIII) was present in the majority of surveyed regions, however the weak aggressive
pathotypes (PI and PII) were the most widespread. Genetic analysis with SSR fingerprinting of these
isolates distinguished high variability within and among identified pathotype groups of A. rabiei,
indicating low correlation between their virulence and the genetic pattern. The characterization of disease
reaction of 6 Moroccan varieties and 18 selected chickpea genotypes against isolates from these three
pathotypes groups revealed a high variability. None of them were resistant to PIII and only one variety
and one genotype were resistant to PII and PI together. Results of this study will be useful in breeding
for Ascochyta blight-resistant chickpea cultivars and development of efficient screening strategies in
Morocco.
 
Date 2017-03-12T22:16:27Z
2017-03-12T22:16:27Z
 
Type Poster
 
Identifier http://www.icarda.org/sites/default/files/u158/ICP2016-Conference-abstract-book.pdf 
https://mel.cgiar.org/reporting/downloadmelspace/hash/d6M2MbRi/v/2b749224b07b28a60cdbde8d01baf299
Sanae Krimi Bencheqroun, Sripada M. Udupa, Aladdin Hamwieh, Seid Ahmed Kemal. (31/12/2016). Virulence and molecular diversity within Ascochyta rabiei in Moroccan population and evaluation of genotypic stability on chickpea.
https://hdl.handle.net/20.500.11766/6417
Open access
 
Language en
 
Rights CC-BY-NC-4.0
 
Format PDF