Ontogenetic characteristics and inheritance of resistance to leaf anthracnose in sorghum

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cg.authorship.typesCGIAR and advanced research instituteen
cg.contributor.affiliationTexas A&M Universityen
cg.contributor.affiliationInternational Institute of Tropical Agricultureen
cg.contributor.affiliationPurdue Universityen
cg.coverage.countryUganda
cg.coverage.iso3166-alpha2UG
cg.coverage.regionAfrica
cg.coverage.regionEastern Africa
cg.issn1021-9730en
cg.subject.iitaPLANT DISEASESen
cg.subject.iitaAGRONOMYen
cg.subject.iitaPESTS OF PLANTSen
dc.contributor.authorTenkouano, A.en
dc.contributor.authorMiller, F.R.en
dc.contributor.authorFredericksen, R.A.en
dc.contributor.authorNicholson, R.L.en
dc.date.accessioned2019-04-24T12:29:40Zen
dc.date.available2019-04-24T12:29:40Zen
dc.identifier.urihttps://hdl.handle.net/10568/100977
dc.titleOntogenetic characteristics and inheritance of resistance to leaf anthracnose in sorghumen
dcterms.abstractThe objectives of this study were to understand the effects of ontogeny on the expression and inheritance of resistance of sorghum (Sorghum hieolor [L.] Moench) to Colletotrichum graminicola (Ces.)Wils., the causal agent of anthracnose. Two resistant cuItivars (SC326-fi and SC599-11E) and two susceptible cuItivars (BTx623 and B35-fi) were inoculated in the greenhouse at different growth stages with three isolates ofC. gramillicola. The response ofSC326-fi was hypersensitive while the reaction ofSC599-11E was ofa slow lesion delimitation type. Susceptible cuItivars failed to restrict lesion growth, particularly in older plants. All cultivars produced phytoalexins in response to attempted infection, but synthesis of these antimicrobial compounds started earlier and proceeded faster in resistant cultivars. Field resistance to C. graminieola was expressed in both juvenile and adult plants of SC326-6. and its progeny. In contrast, reversal of resistance was observed in SC599-11E and its progeny as plant aged. The frequency distribution of disease severity indices was bimodal and fitted a 3:1 segregation, suggesting that resistance was controlled by dominance at a single multiallelic locus. The symbol egl was proposed to designate the resistance locus.en
dcterms.accessRightsLimited Access
dcterms.bibliographicCitationTenkouano, A., Miller, F.R., Fredericksen, R.A. & Nicholson, R.L. (1998). Ontogenetic characteristics and inheritance of resistance to leaf anthracnose in Sorghum. African Crop Science Journal, 6(3), 249-258.en
dcterms.issued1998
dcterms.languageen
dcterms.subjecthost plant resistanceen
dcterms.subjectphytoalexinsen
dcterms.subjectsorghumen
dcterms.subjectpathogensen
dcterms.typeJournal Article

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