Working Document Series Open Access Inheritance of resistance to bacterial blight and implication for rice improvement in Uganda G. Asea · R. Edema · P. Gibson · I. Habarurema +1 more Bacterial blight caused by Xanthomonas oryzae pv.oryzae, is a destructive disease of rice worldwide. Resistant varieties are the best option to avert the disease. Thirty resistance genes identified face a wide genetic diversity exhibited b… RUF-34618 2010 CC BY 4.0 8 Sep 2015
Working Document Series Open Access Importance and approaches of obtaining experimental uniformity P. Gibson The need for a high degree of experimental uniformity is clearly shown by the fact in an experiment that results in a CV (coefficient of variation) of 20%, 8 replications would be required to detect the size of difference between treatment… RUF-34616 2010 CC BY 4.0 8 Sep 2015
Working Document Series Open Access Grain filling patterns of CIMMYT early maize inbred lines R. Edema · E. Gasura · P. Gibson · P. Okori +2 more Despite the ability of early maize to escape drought and provide food early, it yields 20-30% less than late maize. The challenge is to increase yield while maintaining earliness. A study is ongoing at CIMMYT, Harare to determine whether g… RUF-34614 2010 CC BY 4.0 8 Sep 2015
Working Document Series Open Access Genetic variation of Zambian maize inbred lines commonly used in breeding Richard Chanda · C. Mungoma · M. Mwala · K. Mwansa +1 more In sub-Saharan Africa (SSA), breeders have the challenge of developing high yielding maize hybrids that are adapted to farmers’ conditions. This however requires knowledge on the breeding value of elite maize germplasm. Ten (10) maize inbr… RUF-34610 2010 CC BY 4.0 8 Sep 2015
Working Document Series Open Access Phosphate sorption by andisols and ultisols, and its implication on phosphorus bioavailability in the wet tropics of Tanzania E. Kisetu · J.P. Mrema Phosphorus (P) sorption and desorption behaviour of Andisols of Siha - Kilimajaro and Ultisols of Magadu -Morogoro, Tanzania was studied in pot experiments. This was to facilitate development of P management strategies for enhanced maize p… RUF-34606 2010 CC BY 4.0 8 Sep 2015
Working Document Series Open Access Development of improved scald tolerant barley varieties with superior enduse (malt) and nutritional quality for dry land areas of the northern Ethiopia Asmud. Bjornstad · R. Edema · Abay. Feiten Barley is an important cash crop for resource-poor farmers in Tigray region of northern Ethiopian where options are very limited, and barley is often the only possible crop. Biotic stresses plus a harsh environment have contributed to low … RUF-34600 2010 CC BY 4.0 8 Sep 2015
Working Document Series Open Access Comparative effects of Minjingu phosphate rock and triple super phosphate on residual P in an Ultisol A.M. Kalala · J.M.R. Semoka A glasshouse experiment was conducted at Sokoine University of Agriculture to compare the effects of Minjingu Phosphate Rock (MPR) and Triple Super Phosphate (TSP) on Residual Phosphorus in an Ultisol. The soil was collected after seven ye… RUF-34593 2010 CC BY 4.0 8 Sep 2015
Working Document Series Open Access Development of a hot pepper root rot and wilt disease management strategy through genetic resistance, chemical application and proper choice of rotational crops E. Awori · S. Nkalubo · P. Tukamuhabwa · S. Tumwekwase +1 more This study seeks to contribute to increased productivity of hot pepper (Capsicum chinense) by incorporating an integrated pest management (IPM) package for root rot/wilt disease (Phytophthora capsici). Pathogen host diversity will be deter… RUF-34591 2010 CC BY 4.0 8 Sep 2015
Working Document Series Open Access Farmers’ perceptions on maize ear rots and the prospects for breeding farmer preferred varieties in Uganda G. Asea · P. Gibson · P. Okori · L. Tembo Maize ear rots are a major constraint to maize production globally, and yield loses of up to 70% have been reported in Uganda. Developing varieties resistant to ear rots is a practical strategy that provides better insurance for the small … RUF-34586 2010 CC BY 4.0 8 Sep 2015
Working Document Series Open Access Characterization of a diverse set of maize germplasm for resistance to infection by Aspergillus flavus and accumulation of aflatoxin G. Asea · D.B. Kwemoi · P. Okori Sources of resistance to A. flavus have been identified elsewhere but no such materials are currently available for use by the maize improvement program in Uganda. The goal of this study was to initiate breeding for resistance to the fungu… RUF-34558 2010 CC BY 4.0 4 Sep 2015
Working Document Series Open Access The reaction of maize genotypes to maize streak virus disease in central Uganda B. Bua · B. M. Chelimo Documented evidence indicates that maize is production is constrained by a number of a biotic and biotic stresses including Maize streak virus disease (MSVD). Therefore, a study was conducted to assess the reaction of 3 maize genotypes to … RUF-34550 2010 CC BY 4.0 4 Sep 2015
Working Document Series Open Access Developing a broad soybean germplasm base and durable resistance to soybean rust disease in Uganda R. Kawuki · P. Tukamuhabwa · G. Tusiime Soybean rust, Phakopsora pachyrhizi is a major threat to soybean production world-wide. In Uganda breeding for soybean rust resistance has taken priority over other objectives since the first disease rust outbreak in 1996. Three resistant … RUF-34535 2010 CC BY 4.0 25 Aug 2015
Working Document Series Open Access Heterosis and combining abilities for multiple resistance to Turcicum leaf blight and maize streak virus G. Asea · Y. Baguma · P. Okori · L.A. Opio Fifty two single crosses were evaluated for resistance to Turcicum Leaf blight (TLB) and Maize Streak Virus (MSV) resistance across several locations in Uganda in 2009. The crosses were grown in 1-row plots with 2 replications. Subsequentl… RUF-34520 2010 CC BY 4.0 25 Aug 2015
Working Document Series Open Access Enhancing sweetpotato resistance to African weevils (Cylas puncticollis and Cylas brunneus) through transgenic breeding J. F. Kreuze · S.B. Mukasa · R.J. Rukarwa Sweetpotato production is greatly constrained by two weevil species; Cylas puncticollis and C. brunneus that cause yield losses of up to 80%. The use of resistant sweetpotato cultivars is the most sustainable strategy to control the weevil… RUF-34519 2010 CC BY 4.0 25 Aug 2015
Working Document Series Open Access Pyramiding Fusarium root rot resistance genes and validation of SSR PVBR87 in common bean P. Gibson · C. Mukankusi · J. Obala · P.R. Rubaihayo This study determined effectiveness of pyramided Fusarium root rot (FRR) resistance genes and validated association of SSR PVBR87 marker with FRR resistance in common bean. A double cross (DC) involving four resistance sources was used to … RUF-34514 2010 CC BY 4.0 25 Aug 2015
Working Document Series Open Access Assessing effectiveness of macropropagation technology to produce healthy seedlings of banana varieties with high market demand in Eastern and Central provinces, Kenya R. Gathu · N. Kori · J. Mbaka · R. Muasya +2 more Banana is an important food and cash crop in Kenya. However, its cultivation is hindered by scarcity of seedlings, pests and diseases, among other factors. Naturally regenerated seedlings which most farmers rely on are likely to carry pest… RUF-34508 2010 CC BY 4.0 25 Aug 2015
Working Document Series Open Access Combining ability and performance of maize hybrids under low nitrogen and drought stress G. Asea · R. Edema · A. Nyombayire The main objective of this study was to develop maize genotypes that perform well under drought and low-nitrogen stresses. Twelve parents were crossed in a half-diallel mating design. The resultant F1 hybrids were evaluated in four environ… RUF-34506 2010 CC BY 4.0 25 Aug 2015
Working Document Series Open Access Genetic diversity for resistance to larger grain borer in maize hybrids and open pollinated varieties in Kenya S. Mugo · S.W. Munyiri · J.K. Mwololo · P. Okori +1 more Modern maize varieties and hybrids possess improved agronomic performance and tolerance to abiotic and biotic stresses. However, breeding for the traits that contribute to resistance to post harvest pests have not been given due attention.… RUF-34498 2010 CC BY 4.0 25 Aug 2015
Working Document Series Open Access Combining ability analysis of quality protein maize (QPM) and non-PM inbred lines for kernel quality and some agronomic characteristics D. Lungu · J. MacRobert · C. Mutimaamba The biggest population in Zimbabwe depend on maize as a source of carbohydrates, yet it is deficient in protein and therefore makes the population prone to protein malnutrition. Quality Protein Maize (QPM) has double the amount of lysine a… RUF-34497 2010 CC BY 4.0 25 Aug 2015
Working Document Series Open Access Genetics of resistance to bacterial leaf blight in rice germplasm in Uganda G. Asea · P. Gibson · J. Lamo · P.J. Mudingotto +3 more Bacterial leaf blight (BLB) caused by Xanthomonas oryzae pv. oryzae is one of the most serious diseases of rice worldwide. The disease causes significant losses mostly in lowland rice. This study is investigating the mode of gene action of… RUF-34489 2010 CC BY 4.0 25 Aug 2015
Working Document Series Open Access Inheritance of resistance to rice yellow mottle virus disease in selected rice cultivars in Uganda G. Asea · R. Edema · J. Lamo · M.L. Mogga Rice yellow mottle sobemovirus (RYMV) has been identified as the most destructive viral disease in lowland and upland rice. In this study, the mode of inheritance of resistance to a prevalent RYMV strain in Uganda was determined for five r… RUF-34477 2010 CC BY 4.0 21 Aug 2015
Working Document Series Open Access Genetic inheritance studies and early generation marker selection in maize breeding for drought tolerance C. Magorokosho · X. Mhike · P. Okori It has been estimated that approximately US $10 billion of primary food production is lost annually because of drought. Interventions like irrigation are options the majority of the smallholder farmers in sub Saharan Africa cannot afford. … RUF-34476 2010 CC BY 4.0 21 Aug 2015
Working Document Series Open Access Introgressing resistance to Turcicum leaf blight and mapping of associated quantitative trait loci in sorghum M. Abdelbagi Ali · Mayada Mamoun Beshir · P. Gibson · P. Okori Screening for Turcicum leaf blight was carried out in F2 and F2:3 segregating sorghum populations under field and controlled conditions. Disease severity as a percentage of leaf area covered by lesions was computed and the lesion type was … RUF-34473 2010 CC BY 4.0 21 Aug 2015
Working Document Series Open Access Enhancing genetic resistance to soybean rust disease R. Bandyopadhyay · M. Maphosa · C. Mukankusi · H. Talwana Soybean is an important crop worldwide with unrivalled protein quality and content. Sustenance of soybean productivity is, however, compromised by the devastating soybean rust disease caused by the fungus Phakopsora pachyrhizi. Some resist… RUF-34472 2010 CC BY 4.0 21 Aug 2015
Working Document Series Open Access Genetic effects of inbreeding on harvest index and root dry matter content in cassava M. Ferguson · L. Herselman · R.S. Kawuki · M.T. Labuschagne +1 more Inbreeding of predominantly cross-pollinating crops is expected to result in progeny with reduced fitness and or improved phenotypes. The effects of inbreeding in cassava are not well quantified. Accordingly, in this exploratory study, S1 … RUF-34468 2010 CC BY 4.0 21 Aug 2015
