Reaction of selected rice genotypes with monogenic resistance to the isolate of Magnaporthe Oryzae collected at Namulonge, Uganda

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dc.contributor.authorNakiyaga, Solome
dc.contributor.authorChiteka, Zwenhamo Albert
dc.contributor.authorOnaga, Geoffrey
dc.contributor.authorGibson, Paul
dc.contributor.authorOloka, Bonny
dc.contributor.authorBadji, Arfang
dc.contributor.authorEdema, Richard
dc.date.accessioned2022-05-26T20:21:05Z
dc.date.available2022-05-26T20:21:05Z
dc.date.issued2022
dc.description.abstractThe fungus Magnaporthe oryzae causes rice blast disease leading to substantial yield losses. This study aims at understanding the effectiveness of R-genes to the isolate of M. oryzae from Namulonge in Central Uganda to decide the incorporation of their carrier lines in local gene pyramiding programs. Eighty-three genotypes (73 monogenic resistance lines and 10 local varieties) were evaluated in two different experiments along with two susceptible and one resistant check in the screen house in a 10 × 8 alpha lattice design with two replications, inoculated by spraying, phenotyped at 7, 14 and 21 days after inoculation (DAI), and data on for disease severity, severity percentage, disease incidence, and relative area under disease progression were analyzed using the restricted maximum likelihood (ReML) in Genstat. The tested genotypes were significantly (P<0.001) different for the first, second and across experiments at 7, 14 and 21 DAI for all the measured traits indicating genetic variability among the tested germplasm for rice resistance to blast disease caused by the Namulonge isolate of M. oryzae. Twenty-five out of eighty-three (22.9%) genotypes had consistently low disease severity scores during the two experiments with a range of 0-3. The R genes Pi3, Pi5 (t), Pi7 (t), Pi-b, Pik, Pi54, Pik-m, Pit, Pita, Pita-2, Piz, Piz-4, Piz-5 were considered effective to this particular isolate. The results of this study set the basis of a breeding program for rice resistance to blast disease caused by the Namulonge isolate of M. oryzae through gene pyramiding.en_US
dc.identifier.citationSolome, N., Zwenhamo, A. C., Geoffrey, O., Paul, G., Bonny, O., Arfang, B., ... & Richard, E. (2022). Reaction of selected rice genotypes with monogenic resistance to the isolate of Magnaporthe Oryzae collected at Namulonge, Uganda. Journal of Plant Breeding and Crop Science, 14(1), 21-37. DOI: 10.5897/JPBCS2018.0795en_US
dc.identifier.other10.5897/JPBCS2018.0795
dc.identifier.urihttps://nru.uncst.go.ug/handle/123456789/3520
dc.language.isoenen_US
dc.publisherJournal of Plant Breeding and Crop Scienceen_US
dc.subjectRiceen_US
dc.subjectBlast disease resistanceen_US
dc.subjectMonogenic differential linesen_US
dc.subjectReaction profilesen_US
dc.subjectR-genesen_US
dc.titleReaction of selected rice genotypes with monogenic resistance to the isolate of Magnaporthe Oryzae collected at Namulonge, Ugandaen_US
dc.typeArticleen_US
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