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Virulence diversity of Phakopsora pachyrhizi isolates from east Africa compared to a geographically diverse collection

dc.contributor.authorMurithi, H.
dc.contributor.authorHaudenshield, J.
dc.contributor.authorBeed, Fen D.
dc.contributor.authorMahuku, George S.
dc.contributor.authorJoosten, M.H.
dc.contributor.authorHartman, G. L.
dc.date.accessioned2019-12-04T11:08:13Z
dc.date.available2019-12-04T11:08:13Z
dc.date.issued2017
dc.identifier.citationMurithi, H., Haudenshield, J., Beed, F., Maluku, G., Joosten, M.H. & Hartman, G.L. (2017). Virulence Diversity of Phakopsora pachyrhizi Isolates from East Africa Compared to a Geographically Diverse Collection. Plant Disease.
dc.identifier.issn0191-2917
dc.identifier.urihttps://hdl.handle.net/20.500.12478/1764
dc.descriptionFirst Look posted online: 27 March 2017
dc.description.abstractSoybean rust, caused by the biotrophic pathogen Phakopsora pachyrhizi is a highly destructive disease that occurs in many soybean producing regions throughout the world causing substantial yield losses. Knowledge about P. pachyrhizi virulence is needed to guide development and deployment of soybean germplasm with durable resistance against all pathogen populations. To assess the virulence diversity of P. pachyrhizi, 25 isolates from eight different countries including 17 isolates from Africa were characterized on 11 soybean genotypes. All the isolates induced tan lesions with abundant sporulation on genotypes without any known resistance genes and on those with resistance genes Rpp4 and Rpp5b. The most durable gene was Rpp2 as 96% of the isolates induced reddish brown lesions with little or no sporulation. Of the African isolates tested, the South African isolate was the most virulent, whereas those from Kenya, Malawi and some of the isolates from Tanzania had the lowest virulence. An Argentinian isolate was virulent on most host differentials, including two cultivars carrying multiple resistance genes. Ten distinct pathotypes were identified in this study, four of which comprised the African isolates representing considerable P. pachyrhizi virulence. Soybean genotypes carrying Rpp1b, Rpp2, Rpp3, and Rpp5 resistance genes and cultivars Hyuuga and UG 5 were found to be resistant against most of the African isolates and therefore may be useful for soybean-breeding programs in Africa or elsewhere.
dc.format.extent1-29
dc.language.isoen
dc.subjectGenotypes
dc.subjectMalawi
dc.subjectPhakopsora Pachyrhizi
dc.subjectSoybean Rust
dc.subjectBiotrophic Fungus
dc.subjectEastern Africa
dc.titleVirulence diversity of Phakopsora pachyrhizi isolates from east Africa compared to a geographically diverse collection
dc.typeJournal Article
dc.description.versionPeer Review
cg.contributor.affiliationInternational Institute of Tropical Agriculture
cg.contributor.affiliationUniversity of Illinois
cg.contributor.affiliationWorld Vegetable Center
cg.contributor.affiliationUnited States Department of Agriculture
cg.coverage.regionAfrica
cg.coverage.regionEast Africa
cg.coverage.regionSouthern Africa
cg.coverage.countryKenya
cg.coverage.countryMalawi
cg.coverage.countryTanzania
cg.isijournalISI Journal
cg.authorship.typesCGIAR and advanced research institute
cg.iitasubjectDisease Control
cg.iitasubjectPlant Diseases
cg.iitasubjectSoybean
cg.journalPlant Disease
cg.howpublishedFormally Published
cg.accessibilitystatusLimited Access
local.dspaceid83158
cg.targetaudienceScientists
cg.identifier.doihttp://dx.doi.org/10.1094/PDIS-10-16-1470-RE


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