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dc.contributor.authorRwegasira, G.M.
dc.contributor.authorMomanyi, G.
dc.contributor.authorRey, M.E.C.
dc.contributor.authorKahwa, G.
dc.contributor.authorLegg, J.P.
dc.date.accessioned2019-12-04T11:10:36Z
dc.date.available2019-12-04T11:10:36Z
dc.date.issued2011-11
dc.identifier.citationRwegasira, G.M., Momanyi, G., Rey, M.E.C., Kahwa, G. & Legg, J.P. (2011). Widespread occurrence and diversity of Cassava brown streak virus (Potyviridae: Ipomovirus) in Tanzania. Phytopathology, 101(10), 1159-1167.
dc.identifier.issn0031-949X
dc.identifier.urihttps://hdl.handle.net/20.500.12478/2206
dc.description.abstractCassava brown streak disease (CBSD) has been a problem in Tanzania since 1936. Existing literature indicated limited distribution of the disease to low altitudes, usually <100 m above sea level, but the current geographical distribution of the disease was not known. Whether a single or many strains for the virus exist in Tanzania had not been reported to date. In this study, CBSD was recorded from sea level to ≈1,800 m above sea level. In total, 2,730 cassava plants were assessed for CBSD leaf symptoms in 91 fields and root symptoms were assessed at 81 sites. A sample was taken from each site for laboratory screening for Cassava brown streak virus (CBSV). CBSD mean foliar and root incidences were 38 and 36%, respectively. Reverse-transcription polymerase chain reaction of a partial 3′-terminal coat protein (CP) region of CBSV indicated the presence of CBSV in 67 of the 91 (73%) samples. Forty-three amplicons were sequenced, and phylogenetic comparisons with nucleotide sequences from GenBank (National Center for Biotechnology Information database) suggested that one major clade of CBSV primarily exists in Tanzania. However, there was nucleotide sequence divergence of up to 19% among the 42 isolates. In all, 42 of the 43 sequences had 80 to 100% nucleotide identity with 6 previously reported CP-CBSV sequences (from Mozambique and Tanzania). In total, 13 of 42 isolates had <80% nucleotide identities with three previously reported Ugandan CBSV sequences. One isolate, FJ687177, shared <78% sequence identity with the other Tanzanian sequences but was closely related (93%) to Ugandan isolates. It is likely that isolate FJ687177 may belong to a less widely distributed recently described species (clade 2) of CBSV, named Ugandan cassava brown streak virus (UCBSV).
dc.language.isoen
dc.subjectCassava
dc.subjectDiseases
dc.subjectDisease Control
dc.titleWidespread occurrence and diversity of cassava brown streak virus (Potyviridae:Ipomovirus) in Tanzania
dc.typeJournal Article
dc.description.versionPeer Review
cg.contributor.affiliationSokoine University of Agriculture
cg.contributor.affiliationUniversity of the Witwatersrand
cg.contributor.affiliationInternational Institute of Tropical Agriculture
cg.coverage.regionAfrica
cg.coverage.regionEast Africa
cg.coverage.countryTanzania
cg.isijournalISI Journal
cg.authorship.typesCGIAR and developing country institute
cg.iitasubjectCassava
cg.journalPhytopathology
cg.howpublishedFormally Published
cg.accessibilitystatusLimited Access
local.dspaceid90937
cg.identifier.doihttps://dx.doi.org/10.1094/PHYTO-11-10-0297


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