The National Research Repository of Uganda - NRU
Welcome to the National Research Repository of Uganda, abbreviated as "NRU". NRU was established in 2021. NRU is a collection of scholarly output by researchers from the UNCST Community, including scholarly articles and books, electronic theses and dissertations, conference proceedings, journals, technical reports and digitised library collections. It is the official Institutional Archive (IA) of UNCST.
Copyright Information:
For information about the publishers' copyright policy on archiving your articles online or in an institutional archive, visit the Sherpa Site at http://www.sherpa.ac.uk/romeo.php The site gives a summary of the permissions normally given as part of each publisher's copyright transfer agreement. If you wish to publish your research findings in the NRU, please contact NRU administrator at admin@uncst.go.ug for details. NRU operates both open access and closed access models. Access to fulltext has been restricted in adherence to the UNCST Intellectual Property Rights (IPR) and Copyrights policies.
Other Useful Resources:
Africa Portal is an online repository of open access library collection with over 3,000 books, journals, and digital documents on African policy issues. This is an initiative by the Centre for International Governance Innovation (CIGI), Makerere University (MAK), and the South African Institute of International Affairs (SAIIA). Please visit the Africa Portal at http://www.africaportal.org/library.
Communities in NRU
Select a community to browse its collections.
- This community contains Open Access Books and Book Abstracts
- This community contains Ugandan Conference proceedings
- This community contains consolidated Ugandan Institutional Annual Research Reports on a broad range of subjects
- This community contains approved and running institutional repository policies from different research institutions
- This community contains Open access peer reviewed publications about Uganda and from Ugandan Researchers. The community has been classified to thematic research sub communities of Agricultural Sciences, Engineering and Technology, Humanities, Medical and Health Sciences, Natural Sciences and Social Sciences.
Recent Submissions
Genetic diversity, population structure, and a genome-wide association study of sorghum lines assembled for breeding in Uganda
(Frontiers in Plant Science,, 2024-10-07) Kasule, Faizo; Adikini, Scovia; Ugen, Michael Adrogu; Esuma,Williams
Sorghum is an important source of food and feed worldwide. Developing sorghum core germplasm collections improves our understanding of the evolution and exploitation of genetic diversity in breeding programs. Despite its significance, the characterization of the genetic diversity of local germplasm pools and the identification of genomic loci underlying the variation of critical agronomic traits in sorghum remains limited in most African countries, including Uganda. In this study, we evaluated a collection of 543 sorghum accessions actively used in Ugandan breeding program across two cropping seasons at NaSARRI, Uganda, under natural field conditions. Phenotypic data analysis revealed significant (p<0.01) variation among accessions for days to 50% flowering, plant height, panicle exsertion, and grain yield, with broad-sense heritability (H²) estimates of 0.54, 0.9, 0.81, and 0.48, respectively, indicating a high genetic variability for these traits. We used a newly developed genomic resource of 7,156 single nucleotide polymorphism (SNP) markers to characterize the genetic diversity and population structure of this collection. On average, the SNP markers exhibited moderately high polymorphic information content (PIC = 0.3) and gene diversity (He = 0.3), while observed heterozygosity (Ho = 0.07) was low, typical for self-pollinating crops like sorghum. Admixture-based models, PCA, and cluster analysis all grouped the accessions into two subpopulations with relatively low genetic differentiation. Genome-wide association study (GWAS) identified candidate genes linked to key agronomic traits using a breeding diversity panel from Uganda. GWAS analysis using three different mixed models identified 12 genomic regions associated with days to flowering, plant height, panicle exsertion, grain yield, and glume coverage. Five core candidate genes were co-localized with these significant SNPs. The SNP markers and candidate genes discovered provide valuable insights into the genetic regulation of key agronomic traits and, upon validation, hold promise for genomics-driven breeding strategies in Uganda.
“I Don’t Support It for My Children”: Perceptions of Parents and Guardians regarding the Use of Modern Contraceptives by Adolescents in Arua City, Uganda
(International Journal of Reproductive Medicine, 2023-04-03) Vuamaiku,Godfrey Jalinga; Epuitai, Joshua; Andru, Monicah; Aleni, Mary
Despite the high rates of adolescent pregnancies, the utilization of modern contraceptives is still low among adolescents in Uganda which highlights a missed opportunity for the prevention of unwanted pregnancies among adolescents. We explored the perception of parents and guardians regarding the use of modern contraceptives by adolescents and the roles parents and guardians play in the use of modern contraceptives by the adolescents. A descriptive qualitative study was conducted in one of the suburbs of Arua city in the West Nile subregion in Uganda. Fifteen (15) in-depth interviews were conducted with parents and or guardians to explore their perceptions and roles regarding the use of modern contraceptives by adolescents. Thematic analysis was used in qualitative data analysis. Parents did not support adolescents’ use of modern contraceptives. Lack of parental support was related to perceptions that modern contraceptives promote sexual promiscuity, fear that it causes infertility and that it is incompatible with cultural, religious, and moral norms. Parents and guardians opted to emphasize the importance of abstinence, conformity with cultural and religious norms, and the need to focus on completing school instead of encouraging the use of modern contraceptives. Few parents and guardians supported the use of modern contraceptives, specifically condoms, to prevent unwanted pregnancy by the adolescents and parents/guardians, sexually transmitted infections, and early school dropouts. Parents and guardians expressed feelings of inadequacy related to discussions on contraception use with their adolescent children and therefore avoided talking about it. Our study reveals a lack of parental support regarding the use of modern contraceptives among adolescents. Public health interventions which promote intergenerational, socioculturally, and religiously appropriate communication should be instituted in the communities in order to promote sustainable adoption of modern contraceptive use among adolescents.
Genetic Basis of Maize Resistance to Multiple Insect Pests: Integrated Genome-Wide Comparative Mapping and Candidate Gene Prioritization
(Genes, 2020-06-24) Badji, A.; Ibanda, A.; Bararyenya, A.; Rubaihayo, P.
Several species of herbivores feed on maize in field and storage setups, making the development of multiple insect resistance a critical breeding target. In this study, an association mapping panel of 341 tropical maize lines was evaluated in three field environments for resistance to fall armyworm (FAW), whilst bulked grains were subjected to a maize weevil (MW) bioassay and genotyped with Diversity Array Technology’s single nucleotide polymorphisms (SNPs) markers. A multi-locus genome-wide association study (GWAS) revealed 62 quantitative trait nucleotides (QTNs) associated with FAW and MW resistance traits on all 10 maize chromosomes, of which, 47 and 31 were discovered at stringent Bonferroni genome-wide significance levels of 0.05 and 0.01, respectively, and located within or close to multiple insect resistance genomic regions (MIRGRs) concerning FAW, SB, and MW. Sixteen QTNs influenced multiple traits, of which, six were associated with resistance to both FAW and MW, suggesting a pleiotropic genetic control. Functional prioritization of candidate genes (CGs) located within 10–30 kb of the QTNs revealed 64 putative GWAS-based CGs (GbCGs) showing evidence of involvement in plant defense mechanisms. Only one GbCG was associated with each of the five of the six combined resistance QTNs, thus reinforcing the pleiotropy hypothesis. In addition, through in silico co-functional network inferences, an additional 107 network-based CGs (NbCGs), biologically connected to the 64 GbCGs, and differentially expressed under biotic or abiotic stress, were revealed within MIRGRs. The provided multiple insect resistance physical map should contribute to the development of combined insect resistance in maize.
Combining Ability and Gene action for Resistance to Fusarium ear rot in tropical maize hybrids
(Frontiers in Plant Science, 2025-01-30) Ayesiga, Stella Bigirwa; Rubaihayo, Patrick; Dramadri, Isaac Onziga; Sserumaga, Julius Pyton
A comprehensive understanding of the genetics of resistance is essential for developing an effective breeding strategy to create germplasm resistant to Fusarium Ear Rot. This study aimed to determine the general combining ability (GCA), specific combining ability (SCA), and heritability of resistance to infection by Fusarium verticillioides in tropical maize. Using the North Carolina II mating design, six inbred lines as females and seven as males were crossed to produce 42 hybrids, which were evaluated across five environments using artificial inoculation. At harvest, the hybrids were scored for Fusarium Ear Rot (FER) infection using a 1-9 severity scale. Significant GCA effects for the parents and SCA effects for the hybrids were observed. The narrow-sense heritability estimate was 0.22, while the broad-sense heritability was 0.73, and the additive genetic effects, as represented by GCA (m+f), were more significant than non-additive effects. The inbred parents JPS25-13, JPS26-125, JPS26-86, JPS25-11, JPS25-5, JPS25-7, and JPS25-9 were identified as the best general combiners for FER resistance. These lines, with favorable general combining ability effects for resistance to Fusarium verticillioides, are strong candidates for breeding resistant varieties.
Decreased emergence of HIV-1 drug resistance mutations in a cohort of Ugandan women initiating option B+ for PMTCT
(PLoS One, 2017-05-31) Machnowska, Patrycja; Busingye, Priscilla; Rubaihayo, John; Theuring, Stefanie
Since 2012, WHO guidelines for the prevention of mother-to-child transmission (PMTCT) of HIV-1 in resource-limited settings recommend the initiation of lifelong antiretroviral combination therapy (cART) for all pregnant HIV-1 positive women independent of CD4 count and WHO clinical stage (Option B+). However, long-term outcomes regarding development of drug resistance are lacking until now. Therefore, we analysed the emergence of drug resistance mutations (DRMs) in women initiating Option B+ in Fort Portal, Uganda, at 12 and 18 months postpartum (ppm).