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Articles by F.A. Showemimo
Total Records ( 8 ) for F.A. Showemimo
  E. Asare-Bediako , F.A. Showemimo , J.N. Buah and A.O. Ntow-Manu
  A study was conducted to assess the influence of floral induction on the quality of pineapple (Ananas comosus) fruits. Freshly harvested pineapple fruits from farmers’ managed fields that were induced by calcium carbide and non-induced (control) from Ayensudo, a major pineapple producing center in the Central Region of Ghana. The fruits were chemically analysed in the laboratory. The results revealed that moisture content of chemically induced pineapple is lower (84.3%) than the non-induced fruits (86.8%). Total sugars, sucrose and reducing sugars were all higher in induced fruits than the non-induced fruits. Organoleptic analysis showed 88.9% of the consumer preference for chemically induced fruits. Chemical induced fruits have shorter shelf-life than non-induced fruits.
  F.A. Showemimo
  Genetic analysis were carried out to determine heterotic effects, gene action and inheritance of resistance to head bug, Eurystylus oldi Poppius in four sorghum crosses. Resistance was found dominant over susceptibility. Significant negative heterotic effect above mid-parent and better parent for grain damage rating was detected for all crosses. Dominance gene action is more important for the three resistance traits: grain damage rating, floaters percentage and germination percentage. Inheritance to E. oldi is conditioned by one dominant gene in two F2 populations, while resistance in the remaining two F2 populations is controlled by two dominant genes and in part by genes at two or more loci.
  F.A. Showemimo , S.O. Alabi , P.E. Olorunju and O. Ajayi
  Early generation selection based on pedigree selection procedures was applied on F2 populations of Sorghum to select and improve the level of resistance to Sorghum head bug (E. oldi). The base population (F2), F2:3, F2:4 and 6 checks (3 resistant and 3 susceptible cultivars) were evaluated for 4 resistance traits in a randomized block design. Reduction of 178 and 407 head bugs/5 panicles for F2:3 and F2:4 generation was obtained which corresponded to 39.65 and 17.75% of percentage gain/generation of selection. The grain damage rating also reduces considerably. Percentage gain/generation of 57.00 and 59.76 for F2:3 and F2:4 for their grain yield was obtained. Significant but negative phenotypic and genotypic correlations were obtained except for 1000-grain weight, similar trend was observed for correlated response. High percent genetic gain was recorded for all the traits at both generations of selection.
  E. Asare-Bediako , F.A. Showemimo , Y. Opoku-Asiama and D.H.A.K. Amewowor
  Yam minisetts are susceptible to rot caused by microorganisms in both the sprouting media and mother seed yam. This study was conducted to determine the most effective treatment of yam minisetts against rot organisms. Five different protectants/disinfectants were used in vitro and replicated thrice. The result revealed that disinfectants (sodium hypochlorite and aqueous neem leaf extract), protectants (lime, wood ash and Benlate) either suppressed or inhibited the growth of fungi in vitro. Benlate inhibited the growth of all the test fungi, except Rhizopus stolonifer that was tolerant to the fungicide. Aqueous neem leaf extract was the least effective among the disinfectants in controlling fungal growth in vitro. Both quicklime and wood ash suppressed the growth of Aspergillus flavus and Rhizopus stolonifer and completely inhibited the growth of Sclerotium rolfsii and Penicillium sp. Sodium hypochlorite completely inhibited the growth of Sclerotium rolfsii and suppressed the growth of Aspergillus flavus, Fusarium sp., Rhizopus stolonifer and Trichoderma sp. Higher concentrations of the disinfectants and protectants were more effective in controlling the growth of these fungi than the lower concentrations.
  F.A. Showemimo , J.N. Buah , A.A. Addo-Quaye and E. Asare-Bediako
  Factorial mating design was used to generate twenty-five hybrids from five male sterile (A- lines) and five male fertile (R-lines) parents. Ten parents and twenty five hybrids were evaluated in a Randomised Complete Block Design replicated 3 times. Analysis of variance showed significant differences between crosses (male x female interaction) for plant height, 1000 seed weight and grain yield. High heterotic value of 692.03% for grain yield was recorded. Hybrids that exhibited high heterotic value for grain yield, likewise has high heterotic value for yield components; panicle length, panicle weight, 1000 seed weight and number of seed per panicle. Narrow sense heritability was low for seedling vigour, days to 50% bloom plant height, panicle weight, number of seed/panicle and grain yield. Moderate heritability was obtained for panicle length and 1000 seed weight, thus preponderance of non-additive gene action for all traits studied. The best all round hybrids identified from this study are MA10xNR 71143, MA10xNR71146, MA10xNR71167 and 2219AxNR71167.
  F.A. Showemimo
  Striga hermonthica has been identified as an economic parasitic weed affecting high grain yield production of sorghum in Africa particularly Nigeria. Seven sorghum varieties were evaluated for three years (1998-2000) in soil treated with Striga seeds using two sources of nitrogen fertilizer and at five levels of nitrogen to study their association in the control of Striga. The experiment was split-split plot with three replication having sorghum varieties as main plot, source of fertilizer as sub-plot and levels of N as sub-sub plot treatments. There were no significant differences among sources of fertilizer and their interactions. Levels of N and varieties were significant for all the traits (p<0.001). There was positive and significant association between levels of N applied and plant vigour, dry matter yield (shoot and root) p<0.01 and Striga count (p<0.05). The significant linear relationship obtained, recognized plant vigour, dry matter yield and Striga count as beneficial Striga resistance indicator. Between 50 to 100 ppm (when converted 110 to 170 kg of N ha-1) is significant in the control of Striga. SK-5912, KSV-4, KSV-8 and NR71150 are potential sources of Striga resistance.
  F.A. Showemimo and M.Y. Yeye
  Metroglyph and index-score analyses of 10 agro-nutrition characters in 30 quality protein maize lines (accessions) from diverse origin was studied in a Randomized Complete Block Design and replicated thrice in three cropping seasons (1999, 2000 and 2001). Days to physiological maturity and grain yield were used in plotting the glyph (scatter diagram). The 30 QPM lines were separated into six groups. Group I and V; II and IV; III and VI are similar in their days to physiological maturity. Members of Group VI are high yielding, while Group III and IV are potential high yielders with high percent protein content. QPM lines PMG 14 (Group V), PMG 20 and PMG 26 (Group III) PMG 21 (Group I) and PMG 29 (Group VI) are superior lines for crop improvement programs.
  E. Asare-Bediako , F.A. Showemimo and Y. Opoku-Asiama
  Two cultivars of white yam (Pona and Dente) minisetts were used in a study to identify microorganisms causing rot in white yam. Laboratory analysis showed presence of Aspergillus flavus, A. niger, A. ochraceus, Aspergillus sp., A. tamari, Cladosporium sp. Corynebacterium sp. Fusarium sp. Penicillium sp. Rhizopus stolonifer and Trichoderma sp. Pona minisetts were more heavily infected and so suffered more severe rot than Dente minisetts. Among the pathogenic isolates, Sclerotium. rolfsii caused the most severe rot in both Pona and Dente, followed by A. niger and Fusarium sp. while the least were R. stolonifer, Trichoderma sp. and Corynebacterium sp. Use of disinfectants were suggested as pre-planting treatment to control the pathogens.
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