Show simple item record

dc.contributorAbang, Mathewen_US
dc.contributorHaouas, Samiren_US
dc.contributorUdupa, Sripada M.en_US
dc.contributorRezgui, Salahen_US
dc.contributorBaum, Michaelen_US
dc.contributorYahyaoui, Amoren_US
dc.creatorBouajila, Aidaen_US
dc.identifier.citationAida Bouajila, Mathew Abang, Samir Haouas, Sripada M. Udupa, Salah Rezgui, Michael Baum, Amor Yahyaoui. (11/4/2007). Genetic diversity of Rhynchosporium secalis in Tunisia as revealed by pathotype, AFLP, and microsatellite analyses. Mycopathologia, 163, pp. 281-294.en_US
dc.description.abstractGenetic variability among 122 Rhynchosporium secalis isolates collected from barley in three regions of Tunisia was investigated using host differentials, amplified fragment length polymorphism (AFLP), and microsatellite markers. The isolates were collected from a widely grown scald-susceptible barley cultivar Rihane and a range of local landrace cultivars in geographically distinct regions with different agroclimatic conditions. Pathotypic diversity (the proportion of unique pathotypes) was high in R. secalis populations from the high (100% diversity), moderate (95%), and low (100%) rainfall areas of Tunisia, and from both Rihane (which is the sole variety grown in the high rainfall region) and local landraces (which predominate in the low rainfall area). This may reflect a general adaptability for aggressiveness and suggests that the widely grown cultivar Rihane has exerted little or no selection pressure on the pathogen population since its release in 1983. Genotypic diversity (GD), defined as the probability that two individuals taken at random had different genotypes, was high for populations from Rihane, local landraces, and different agro-ecological zones (GD = 0.96-0.99). There was low genetic differentiation among pathogen populations from different host populations (G(ST) <= 0.08, theta <= 0.12) and agro-ecological zones (G(ST) <= 0.05, theta <= 0.04), which may be partly explained by gene flow due to the movement of infected stubble around the country. There was no correlation (r = 0.06, P = 0.39) between virulence phenotype and AFLP haplotype. A phenetic tree revealed groups with low bootstrap values that did not reflect the grouping of isolates based on host, pathotype, or agro-ecological region. The implications of these findings for R. secalis evolutionary potential and scald-resistance breeding in Tunisia are discussed.en_US
dc.publisherSpringer (part of Springer Nature)en_US
dc.rightsCopyrighted; all rights reserveden_US
dc.sourceMycopathologia;163,(2007) Pagination 281,294en_US
dc.subjectgenetic structureen_US
dc.subjectbarley scalden_US
dc.titleGenetic diversity of Rhynchosporium secalis in Tunisia as revealed by pathotype, AFLP, and microsatellite analysesen_US
dc.typeJournal Articleen_US
cg.creator.idUdupa, Sripada M.: 0000-0003-4225-7843en_US
cg.creator.idBaum, Michael: 0000-0002-8248-6088en_US
cg.subject.agrovocrhynchosporium secalisen_US
cg.contributor.centerInternational Center for Agricultural Research in the Dry Areas - ICARDAen_US
cg.contributor.centerUniversity of Tunis El Manar, Faculty of Economic Sciences and Management of Tunis - UTM - FSEGen_US
cg.contributor.centerNational Agronomic Institute of Tunisia - INATen_US
cg.contributor.funderInternational Center for Agricultural Research in the Dry Areas - ICARDAen_US
cg.contributor.projectCommunication and Documentation Information Services (CODIS)en_US
cg.contributor.project-lead-instituteInternational Center for Agricultural Research in the Dry Areas - ICARDAen_US
cg.coverage.regionNorthern Africaen_US
dc.identifier.statusTimeless limited accessen_US

Files in this item


There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record

DSpace software copyright © 2002-2016  DuraSpace
MELSpace content providers and partners accept no liability to any consequence resulting from use of the content or data made available in this repository. Users of this content assume full responsibility for compliance with all relevant national or international regulations and legislation.
Theme by 
Atmire NV