Show simple item record

Pathogenic and genetic variability among Colletotrichum gloeosporioides isolates from different yam hosts in the agroecological zones in Nigeria

dc.contributor.authorAbang, Mathew M.
dc.contributor.authorAsiedu, Robert
dc.contributor.authorHoffmann, P.
dc.contributor.authorWolf, G.A.
dc.contributor.authorMignouna, H.D.
dc.contributor.authorWinter, S.
dc.date.accessioned2019-12-04T11:18:10Z
dc.date.available2019-12-04T11:18:10Z
dc.date.issued2006
dc.identifier.citationAbang, M.M., Asiedu, R., Hoffmann, P., Wolf, G.A., Mignouna, H.D. & Winter, S. (2006). Pathogenic and genetic variability among Colletotrichum gloeosporioides isolates from different yam hosts in the agroecological zones in Nigeria. Journal of Phytopathology, 154(1), 51-61.
dc.identifier.issn0931-1785
dc.identifier.urihttps://hdl.handle.net/20.500.12478/3087
dc.description.abstractAnthracnose, caused by Colletotrichum gloeosporioides Penz., is the most severe foliar disease of water yam (Dioscorea alata) worldwide. Population genetic analyses can yield useful insights into the evolutionary potential of C. gloeosporioides and thus lead to the development of appropriate disease management strategies. The genetic structure of C. gloeosporioides populations from yam and non-yam hosts in three agroecological zones of Nigeria was investigated. Microsatellite-primed polymerase chain reaction (MP-PCR), virulence phenotyping using five putative D. alata differentials, cross-inoculation tests, and the presence/absence of a Glomerella teleomorph in yam fields were used to infer the evolutionary potential of C. gloeosporioides on yam. We observed high genotypic diversity (GD = 0.99 to 1.00) for populations from all hosts and agroecological zones, with multiple pathogen genotypes in individual anthracnose lesions. Genetic differentiation was low among pathogen populations from different hosts (GST = 0.10, θ = 0.034), and agroecological zones (GST = 0.04, θ = 0.018), indicating limited host differentiation and significant gene flow. No evidence was found for the existence of C. gloeosporioides f. sp. alatae reported in previous studies. The fungus was recovered from several non-yam host species commonly found in yam fields but non-yam isolates caused only mild to moderate symptoms on yam. Eighteen C. gloeosporioides virulence phenotypes were identified among 217 isolates but there was a weak correlation (r = 0.02, P = 0.40) between virulence phenotype and MP-PCR haplotype. Consistent with the above findings, we observed for the first time the Glomerella teleomorph on anthracnose-infected yam plants in Nigeria, indicating that sexual recombination might play an important role in anthracnose epidemics on yam. The implications of these findings for C. gloeosporioides evolutionary potential and anthracnose resistance breeding are discussed.
dc.description.sponsorshipGerman Academic Exchange Service
dc.language.isoen
dc.subjectAnthracnose
dc.subjectColletotrichum Gloeosporioides
dc.subjectDioscorea Spp
dc.subjectGlomerella Teleomorph
dc.subjectGenetic Structure
dc.subjectMicrosatellite-Primed-Pcr
dc.subjectPathotype
dc.subjectYams
dc.titlePathogenic and genetic variability among Colletotrichum gloeosporioides isolates from different yam hosts in the agroecological zones in Nigeria
dc.typeJournal Article
dc.description.versionPeer Review
cg.contributor.affiliationGerman Collection of Microorganisms and Cell Cultures
cg.contributor.affiliationInternational Institute of Tropical Agriculture
cg.contributor.affiliationGeorg-August-Universität Göttingen
cg.contributor.affiliationVirginia Polytechnic Institute and State University
cg.contributor.affiliationInternational Center for Agricultural Research in the Dry Areas
cg.coverage.regionAcp
cg.coverage.regionAfrica
cg.coverage.regionEurope
cg.coverage.regionWest Africa
cg.coverage.regionNorth America
cg.coverage.regionCentral Africa
cg.coverage.countryGermany
cg.coverage.countryNigeria
cg.coverage.countryUnited States
cg.coverage.countryCameroon
cg.isijournalISI Journal
cg.authorship.typesCGIAR and advanced research institute
cg.iitasubjectDiseases Control
cg.iitasubjectPests Of Plants
cg.iitasubjectPlant Breeding
cg.iitasubjectYam
cg.iitasubjectLivelihoods
cg.iitasubjectMarkets
cg.iitasubjectAgribusiness
cg.iitasubjectDomestic Trade
cg.iitasubjectFarm Management
cg.iitasubjectHandling, Transport, Storage And Protection Of Agricultural Products
cg.iitasubjectNutrition
cg.iitasubjectPlant Diseases
cg.iitasubjectPlant Production
cg.iitasubjectFood Security
cg.accessibilitystatusLimited Access
local.dspaceid94553
cg.identifier.doihttps://dx.doi.org/10.1111/j.1439-0434.2005.01060.x


Files in this item

Thumbnail
Name:
abang-pathogenic-2006.pdf
Size:
266.3Kb
Format:
PDF
View/Open

This item appears in the following Collection(s)

Show simple item record