Vegetative compatibility among isolates of Colletotrichum gloeosporioides from yam (Dioscorea spp.) in Nigeria

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dc.creatorAbang, Mathew M.
dc.creatorHoffmann, P.
dc.creatorWinter, S.
dc.creatorGreen, K.R.
dc.creatorWolf, G.A.
dc.date2004-01
dc.date2018-08-09T06:40:32Z
dc.date2018-08-09T06:40:32Z
dc.date.accessioned2026-06-27T15:53:24Z
dc.descriptionIsolates of Colletotrichum gloeosporioides obtained from yam-based cropping systems in Nigeria, previously characterized on the basis of morphology, virulence and rDNA internal transcribed spacer (ITS) sequence variation were further compared for vegetative compatibility (VC). Chlorate-resistant nitrate non-utilizing (nit) mutants were generated from the isolates and used in complementation (heterokaryon) tests. Tests of VC between complementary mutants from different isolates indicated the presence of several genotypes within a single field, suggesting limited clonal spread. In some cases, isolates obtained from the same lesion were observed to belong to different vegetative compatibility groups (VCGs). No compatibility was observed between isolates of the highly virulent slow-growing grey (SGG), the moderately virulent fast-growing salmon (FGS) and the avirulent/weakly virulent fast-growing grey (FGG) strains. Forty-one C. gloeosporioides isolates belonged to 28 VCGs, giving a genotype diversity estimate of 0.68. This diversity confirmed the high variability of the pathogen population as revealed by previous characterization studies, however, a correlation between VCGs and isolate groupings based on morphology and virulence was not found. The finding that an isolate from weed was compatible with yam isolates indicated that transfer of important traits, such as virulence, may take place between isolates from yam and non-yam hosts. The VCG diversity revealed by this study suggests that in addition to asexual reproduction, sexual reproduction may play an important role in the epidemiology of anthracnose on yam.
dc.identifierhttps://hdl.handle.net/10568/96361
dc.identifier.urihttp://hdl.handle.net/123456789/116518
dc.languageen
dc.publisherWiley
dc.rightsLimited Access
dc.sourceAbang, M.M., Hoffmann, P., Winter, S., Green, K.R. & Wolf, G.A. (2004). Vegetative compatibility among isolates of Colletotrichum gloeosporioides from yam (Dioscorea spp.) in Nigeria. Journal of Phytopathology, 152(1), 21-27.
dc.subjectanthracnosis
dc.subjectdioscorea
dc.subjectyams
dc.subjectgenetics
dc.subjectphysiology
dc.titleVegetative compatibility among isolates of Colletotrichum gloeosporioides from yam (Dioscorea spp.) in Nigeria
dc.typeJournal Article

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