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Variability of Peronosclerospora sorghi isolates from different geographic locations and hosts in Africa

dc.contributor.authorBock, C.H.
dc.contributor.authorJeger, M.J.
dc.contributor.authorMughogho, L.K.
dc.contributor.authorCardwell, K.
dc.contributor.authorMtisi, E.
dc.contributor.authorKaula, G.
dc.contributor.authorMukansabimana, D.
dc.date.accessioned2019-12-04T11:30:21Z
dc.date.available2019-12-04T11:30:21Z
dc.date.issued2000
dc.identifier.citationBock, C.H., Jeger, M.J., Mughogho, L.K., Cardwell, K., Mtisi, E., Kaula, G. & Mukansabimana, D. (2000). Variability of Peronosclerospora sorghi isolates from different geographic locations and hosts in Africa. Mycological Research, 104(1), 61-68.
dc.identifier.urihttps://hdl.handle.net/20.500.12478/5264
dc.description.abstractNine isolates of Peronosclerospora sorghi from maize, sorghum and wild sorghum were sampled from Zimbabwe, Zambia, Rwanda, Mozambique and Kenya. They were compared for variation in conidium and conidiophore morphology, temperature requirements for sporulation, germination and germ-tube growth and for pathogenicity on different sorghum and maize cultivars. Although there were significant differences in isolate morphology, all conformed to the known range for P. sorghi. Mean conidial length×width ranged from 21–23 μm×16•9–19•2 μm, and mean conidiophore length (basal cell-branching) ranged from 116•3–135•6 μm. All isolates sporulated in the range 14–26 °C (optimal at 16–23°), although one isolate from maize from Umbeluzi in Mozambique had a broader optimal range for sporulation (12–25°). Conidia of all isolates germinated between 10° and 34°. Germ-tube response to temperature was similar for all isolates (10–34°). The isolates varied in their pathogenicity towards sorghum cultivars, with an isolate from Rwanda being pathogenic to more sorghum differentials than any other. Cluster analysis of isolates based on host reaction indicated five groups at the 85% similarity level. The existence of pathogenic variability has ramifications for the breeding of sorghum for resistance to downy mildew in Africa.
dc.language.isoen
dc.subjectMaize
dc.subjectSorghum
dc.subjectPathogens
dc.subjectBreeding
dc.titleVariability of Peronosclerospora sorghi isolates from different geographic locations and hosts in Africa
dc.typeJournal Article
dc.description.versionPeer Review
cg.contributor.affiliationCentre for Plant Biochemistry, Australia
cg.contributor.affiliationWageningen University and Research Centre
cg.contributor.affiliationInternational Crops Research Institute for the Semi-Arid Tropics
cg.contributor.affiliationInternational Institute of Tropical Agriculture
cg.contributor.affiliationDepartment of Research and Specialists Services, Zimbabwe
cg.contributor.affiliationMount Makulu Research Station, Malawi
cg.contributor.affiliationRwanda Agricultural Research Institute
cg.coverage.regionAsia
cg.coverage.regionAcp
cg.coverage.regionAfrica
cg.coverage.regionPacific
cg.coverage.regionEurope
cg.coverage.regionSouthern Africa
cg.coverage.regionWest Africa
cg.coverage.regionEast Africa
cg.coverage.countryAustralia
cg.coverage.countryNetherlands
cg.coverage.countryZimbabwe
cg.coverage.countryBenin
cg.coverage.countryZambia
cg.coverage.countryRwanda
cg.isijournalISI Journal
cg.authorship.typesCGIAR and developing country institute
cg.iitasubjectFood Security
cg.iitasubjectMaize
cg.iitasubjectPlant Breeding
cg.iitasubjectPlant Diseases
cg.accessibilitystatusLimited Access
local.dspaceid103621


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