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Articles by S.P. Bako
Total Records ( 4 ) for S.P. Bako
  S.P. Bako
  A glasshouse study was conducted to evaluate the effects of high temperature growth conditions on the integrity of the photosynthetic pigment complex in maize (Zea mays L.) plants and to elucidate the influence of ascorbate and kinetin applications. Total chlorophyll content declined with age in all categories of plants. Ascorbate and kinetin applications tended to slow down the rate of chlorophyll loss even though these treatments did not increase the pigment content of treated plants significantly over those in untreated plants. Chlorophyll a:b ratio varied significantly with plant age under both ambient and high temperature conditions for both of ascorbate and kinetin treatments. These ratios were higher in heat stressed plants than in non-stressed plants. Chlorophyll: Carotenoid ratios varied significantly with plant age both under ambient and high temperature growth conditions for both ascorbate and kinetin treatments. These ratios were generally higher under ambient conditions than under heat stress conditions. Correlations between air temperature and pigment contents/ratios were mainly negative and were generally higher under high temperature than under ambient growth conditions. Similarity in the pattern of variation of both Chlorophyll a:b ratios and Chlorophyll: Carotenoid ratios observed in this study emphasized the close functional relationship between the pigments. Applied substances did not significantly influence the integrity of the photosynthetic light-harvesting complex at the concentrations used in this study.
  S.P. Bako and F. Adams
  An experiment was conducted to evaluate the relative effectiveness of applying locally derived plant products, namely oil from groundnut (Arachis hypogaea L.) seeds and juice extracted from lime (Citrus aurantifolia L.) fruits on respiratory weight loss of yam (Dioscorea rotundata Poir) tubers and fruits of Valencia orange (Citrus sinensis L.) and tomato (Lycopersicon esculentum Mill.) during storage under ambient conditions, in the Savanna region of Nigeria. Rate of weight loss during early periods of the observation was minimal in all the three stored products when groundnut oil coating was applied and maximal in uncoated products. Mean weight loss was reduced by both lime and groundnut oil coatings, although, for yam and Valencia oranges this was significantly (p=0.05) lower for groundnut oil coatings than lime juice coatings. In tomato fruits the differences in weight loss between fruits treated with the two coating materials at the termination of observation period was not significant. Weight loss was generally attributed to respiration and transpiration and groundnut oil was seen as a possible alternative to synthetic waxes in controlling this process in stored yams, oranges and tomatoes, in rural communities under tropical savanna conditions.
  S.P. Bako , M.J. Bakfur , I. John and E.I. Bala
  A study was conducted to evaluate the usage in trado-medicine and phytochemical profiles of some plants of common occurrence in the Savanna eco-region of Nigeria. The plant species evaluated, included three members from legumes and Liliaceae and one each of the Annonaceae, Burseraceae and Solanaceae. Their acclaimed uses in traditional medicine are as varied as their taxonomic distribution. Phytochemical analyses in acetone revealed that Entada africana, Dichrostachys glomerata, Annona senegalensis and Boswellia dalzielli had the highest diversity of phytochemicals (4 classes each), followed by Piliostigma thonningii, which had three classes and then Datura metel, Asparagus africana and Urginea ultissima which had two classes. Aloe barterri had only one class. In petroleum ether Annona senegalensis had the highest diversity of phytochemicals (4 classes) followed by Datura metel, Entada africana, Piliostigma thonningii and Boswellia dalzielli, which had three each. Each of Asparagus africana and Urginea ultissima had one class. Aloe barterii did not yield any phytochemical. The saponins had the highest frequency of occurrence (100%) followed by alkaloids (66.7%), tannins (57.1%), flavonoids (55.6%), then anthraquinones, sapogenins and terpenes (33.3% each). In petroleum ether, saponins also had the highest frequency of occurrence (88.9%) followed by sapogenins and terpenes (44.4%), tannins and flavonoids (33.3% each), anthraquinones (28.6%) and then alkaloids (0.0%).
  S.P. Bako and P. Daudu
  In industrial areas of the world the disposal of heavy metals such as mercury, cadmium, lead, copper and arsenic evokes great concern because of their increasing concentrations in many waters. This study was conducted to evaluate the metal content of the two common species of aquatic macrophytes (Polygonum sp. and Ludwigia sp.) in relation to the metal content of the sediments in Makwaye and Kubanni Lakes in the Nigerian Northern Guinea Savanna. Analysis of the elemental content of the samples was done using the Energy dispersive X-ray fluorescence Spectroscopy (XRF) method. Iron (Fe) was present at highest concentration, of 8 metals evaluated in both lakes. Titanium (Ti), Manganese (Mn), Nickel (Ni), Copper (Cu), Zinc (Zn) and Arsenic (As) followed in that order. Significantly, lead (Pb) was not recorded in the sediments of any of the two lakes. Concentrations of all the metals in the sediments of both lakes, as well as plant shoots were higher than levels internationally regarded as normal. Accumulation patterns for the trace metals in plants were in the order Fe>Ti>Mn>Cu. Ni, Zn, As and Pb were not detected in the shoot tissues of either species, although all (except Pb) were present in the sediments. Between 45-100% Mn found in the sediments of the two lakes was found in the shoots of the two plant species, while for Cu this was 31-34%, Ti (15-42%) and Fe (7-21%). On the whole accumulation patterns of metals in plant shoots suggested a trend that reflects the level of toxicity of the metals to plant tissues, with Fe, Ti, Mn and Cu following in that order. Implications of these findings in relation to biocontamination of the food chain and possibilities for phytoremediation are discussed.
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