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Articles by E.A. Edu
Total Records ( 5 ) for E.A. Edu
  O. Udensi , E.J. Umana , E.A. Edu and E.V. Ikpeme
  This study investigated the nutritive value of locally grown pulses’ landraces (White “Fiofio”, Brown “Fiofio”, [Cajanus cajan (L.) Millsp] “Olaudi” “Akidi” and IT88D-867-11) [Vigna unguiculata (L) Walp] as indices for conservation and improvement. Proximate, anti-nutritional and mineral elements were evaluated. Data analyses were done using analysis of variance. Results showed that there were significant differences (p<0.05) in the proximate compositions of the screened pulses, except in the ash content which shows no significance among the pulses (p>0.05). The moisture content did not differ among the brown and white “Fiofio”, “Olaudi” and IT88D-867-11 but differed significantly from “Akidi”. Results obtained also revealed that there was no significant difference (p>0.05) in the protein contents of brown “Fiofio”, “Akidi” and IT88D-867-11 but differed slightly from white “Fiofio” and “Olaudi”. Additionally, “Olaudi” had the highest protein content in its seeds. There was no significant difference in the carbohydrate content among brown “Fiofio”, “Olaudi” and “Akidi” but differed from white “Fiofio” and IT88D-867-11. Present results on the anti-nutritive contents also showed that there were significant differences (p<0.05) among the five sampled pulses. “Akidi” had the highest phytic acid level which was followed by IT88D-867-11. There was no significant difference in the hydrocyanide content of “Akidi”, “Olaudi” and IT 888D-867-11. This component was highest in brown “Fiofio” and least in white “Fiofio”. The oxalate content was highest in “Akidi”. Comparing other pulses with IT88D-867-11, the landraces contained higher mineral elements. For the vitamins, IT88D-867-11 contained the highest level of Vitamin A but had the least Vitamin C. Coupled with their high adaptability in adverse climatic conditions, it is explicitly obvious that these landraces should be selected for conservation and improvement.
  O. Udensi , E.V. Ikpeme , E.A. Edu and D.E. Ekpe
  Establishing the extent of relationship, identifying the cause and measuring the relative importance of such associations to yield is very crucial for varietal selection, breeding and subsequent improvement of crops, especially cowpea landraces. This research x-rays correlation coefficients and path coefficients of yield and yield-influencing traits in cowpea landraces. Seeds of four varieties of locally grown cowpea were sown in a Randomized Complete Block Design (RCBD) in ten replications. The field study was carried out at the University of Calabar Experimental Farm, University of Calabar, Nigeria, during the 2010-2011 growing season. Correlation coefficients and path coefficients were computed on yield and yield-contributing traits. Results obtained revealed that significant relationships between yield and yield-contributing traits existed which could be indices for selection. Genotypic correlations coefficients were high and more significant than the phenotypic and environmental correlation coefficients. Path coefficient analysis shows that number of pod per plant had the highest direct effects to cowpea yield (0.588). This was followed by number of flowers (0.454), number of seeds per pod (0.366), leaf area at 5 weeks (0.366) and pod length and 100 seed weight (0.316), respectively. Other morphological traits had negative direct effects on seed yield such as vein length at 10 weeks (-0.627), number of leaves at 5 weeks (-0.215), number of leaves at 10 weeks (-0.033), leaf area at 10 weeks -1.124, days to 50% flowering (-0.083) and days to 50% maturity (-0.066). Succinctly, it therefore implies that number of pods per plant, number of leaves per plant, leaf area, number of flowers per plant, pod length and number of seeds per pod are good selection indices for a high yielding variety of cowpea, especially the landraces. This then can be exploited in hybridization programmes involving cowpea.
  A.A.J. Mofunanya and E.A. Edu
  This study was carried out to determine physiological and biochemical changes in C. moschata inoculated with a Nigerian strain of MWMV isolated from Lagenaria breviflora in Calabar, Nigeria. The virus infection resulted in significant (p≤0.05) reductions in plant height, leaf area and number of leaves produces with highest percentage difference of 39.3% (42 PID), 60.9% (35 PID) and 25.7% (49 PID), respectively. There was a significant (p≤0.05) difference in chlorophyll content between inoculated and healthy plants. The chlorophyll content of inoculated plants at all stages of growth was lower compared with the healthy plants. Chlorophyll b content was higher than Chl a in both inoculated and healthy plants. Chlorophyll a, b and total Chlorophyll were significantly reduced in inoculated plants when compared with the healthy ones. Of the twelve photochemicals screened, alkaloids, glycosides, saponins, tannins, terpenoids, steroids, polyphenols and reducing sugars were present while phlobatanins, anthraquinones and hydroxymethyl anthraquinones were absent. Moroccan watermelon mosaic virus engendered reductions in alkaloids (32.1%), reducing sugars (42.0%), saponins (33.6%), terpenoids (25.0%) and steroids (15.0%) and increase in inoculated samples of glycosides (14.8%) and flavonoids (12.5%). Effect of MWMV on proximate compositions of C. moschata revealed significant p≤0.05) reductions in lipid (25.0%) and ash (14.6%) and significant (p≥0.05) increases in protein (23.4%) and fibre (10.5%). Effect of the virus on carotene, vitamin A and C were insignificant. Infection of MWMV also led to significant decreases in the contents of K (48%), Fe (28.6%), Zn (25.0%) and Mg (22.0%), while Cu recorded 100% increase in inoculated samples. Marginal increase in Ca and P were recorded in inoculated samples. Infection of MWMV on antioxidants caused significant increase in inoculated samples of hydrocyanic acid and insignificant increases in total and soluble oxalate and phytic acid. Increases recorded in the antioxidant contents in plants inoculated with MWMV resulted in reduced bioavailability of minerals in the vegetable. Reduction in chlorophyll contents in inoculated plants would be a major factor explaining poor growth of host plants with attendant reductions in mineral elements of C. moschata. Changes in physiological and biochemical parameters induced by MWMV altered vital metabolic processes of C. moschata.
  O. Udensi , E.A. Edu , E.J. Umana and E.V. Ikpeme
  The negligence of breeders and farmers to explore and exploit landraces of pulses is worrisome and urgent measures needed to be set in motion to forestall major future crisis, taking into cognizance the high adaptability and nutritive values accredited to them. This study focused on the estimation of genetic variability and heritability of desirable morphological characters in Fiofio (Cajans cajan) and Olaudi and Akidi (Vigna unguiculata) with the aim of conservation. Three landraces of pulses were sown using randomized complete block design. The field experiment was carried out at the University of Calabar Experimental Farm, University of Calabar, Calabar, during 2008-2010 growing season. Phenotypic and genotypic variances and coefficients of variation and genetic advance were estimated on yield and yield-related traits. The results showed that there were considerable variations among the pulses for the traits studied. The result revealed high genetic variability in the number of leaf per plant, leaf area, number of flowers per plant, number of pods per plant and number of seeds per plant. It also showed that genetic variability in pod length and 100-seed weight was low. Heritability estimates obtained in the result were very high though the magnitude of genetic variability in the yield and yield-related traits was not proportional to the heritability estimates. The traits studied also show high genetic advance. These explicitly showed that there are sufficient genetic variations to warrant conservation and improvement in these extinction-threatened pulses studied.
  M.O. Ononyume , E.A. Edu , T. Okoh and A.P. Inegbedion
  Objective: Growth performances of four maize varieties (91 SUWANI, TZL COMP 4, DT STR Y SYN 2 and IWO SYN C2) were investigated at four levels of silicon concentration (0, 2500, 5000 and 7500 mg, with 0 mg as control). Methodology: Viable seeds were planted in polythene bags (64 bags) containing soil in a randomized complete block design (a 4×4 factorial experiment) with four replications. Plant height, stem girth, leaf area and leaf number were evaluated at 4, 6, 8 and 10 weeks after planting. Results: There was significant difference (p≤0.05) for all growth parameters and across varieties. Highest mean plant height (144.58 cm) and mean number of leaves (12.23) were recorded at 5000 mg silicon concentration in all varieties, while stem girth and stem biomass were highest in TZL COMP4 (3.42 cm, 38.44 dry weight g–1). Conclusion: Based on these results, 5000 mg silicon concentration is recommended as nutrient supplement to enhance maize production.
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