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Articles by C.E. Umebese
Total Records ( 4 ) for C.E. Umebese
  C.E. Umebese , T.O. Olatimilehin and T.A. Ogunsusi
  Problem statement: Seedlings of Amaranthus hybridus cv. NHAC-3 (large green, amaranth) and Lycopersicum esculentum cv. Roma (tomato) were subjected to 7 days water stress at Early Vegetative (EV), Late Vegetative (LV), Early Flowering (EF) and Late Flowering (LF) stages of growth to study the impact on leaf water potential (ψw), Nitrate Reductase Activity (NRA), growth (plant height, shoot and root biomass) and proline content of both plants. Approach: Two concentrations of salicylic acid (1 and 3 mM SA) were applied to stressed plants to study the level of protection given by SA to the plants. Leaf ψw was significantly reduced (p = 0.05) during stress treatment at nearly all stages of growth in both plants. Leaf ψw was in the range -0.25 to -1.42 (unstressed) and -1.45 to -2.02 (stressed) in tomato plants while in amaranth it was -0.7 to -1.62 (unstressed) and -1.62 to -2.68 (stressed). As 3 mM SA increased leaf ψw to values close to the control (unstressed plants). NRA was significantly (p = 0.05) reduced by stress treatment at the LV stage of amaranth, EF stage of tomato and LF stage of both plants. Results: Thus, the reduction of NRA was more pronounced at the reproductive stage of both plants. As 3 mM SA was effective in maintaining NRA at levels similar to the control in both plants. Stress treatment reduced plant height significantly (p = 0.05) at the vegetative stages of both plants and 3 mM was also effective in keeping plant height similar to the control. Though shoot biomass was affected by water stress, SA treatment was not very effective in preserving the biomass during stress. Root biomass of plants was reduced by stress treatment at the reproductive stage and only tomato plants responded positively to 3 mM SA. Proline content was only slightly increased at all stages of growth in stressed plants but 3 mM SA induced a two-fold increase in proline content at the vegetative stage of tomato (EV and LV) and significant increases (p = 0.05) at almost all stages of growth of amaranth. Conclusion/Recommendations: The build up of proline, an osmolyte, by SA in stressed plants increased the capacity of plants to absorb water from the soil as shown by the increase in leaf ψw of both plants from -1.45 to -0.25 . SA was more effective in protecting the plants against the adverse effects of water stress when the stress was given at the vegetative stages (EV and LV) than at the flowering stages (EF and LF).
  F.B. Adejare and C.E. Umebese
  Glycine max (L.) Merril. cultivars TGX 536-02D cv. A) and TGX 923-2E (cv. B) were subjected to water stress for 7 days at the vegetative stage (T2), flowering/fruiting stage (T3), seed development stage (T4) and the control (T1) with water potential (ψw) values of about -1.5, -2.3, -2.7 and -0.3 MPa, respectively. Stressed T3 and T4 plants of both cultivars had very low tolerance (20-46%). Trichomes were present in the abaxial epidermis of T3 and T4 plants with higher occurrence in cv.B and stomata were sunken. Generally, abaxial and adaxial stomatal aperture of stressed cultivars decreased in the order T2>T3>T4 stages and there was a corresponding increase in stomatal index in stressed plants. The low tolerance of T3 and T4 plants coupled with significant reduction in stomatal aperture with increase in stomatal index may have caused the drastic reduction in number of pods and seed yield of these stressed plants. While yield of T2 plants of cv. B was also significantly reduced (p<0.05), 100 seed weight of cv. A was significantly enhanced. Both cultivars are capable of osmotic adjustments as shown by the accumulation of sugars and the reduction of lipids and starch in seeds of stressed plants with greater accumulation of sugar in cv. B. Hence the reproductive stage is critical in the growth of both cultivars but cv. B shows greater osmotic and structural adjustments than cv. A.
  O.E. Ade-Ademilua and C.E. Umebese
  Seeds of Phaseolus vulgaris L. cv. Ife Brown sown in the site at close proximity to a cement factory (polluted), produced sprawling plants with their life span shortened by 28 days, a low pod yield, few and small sized seeds. The time of flower initiation, pod formation to pod ripening was markedly reduced. These plants accumulated a significantly high (17.01 μmol mol-1) concentration of aluminium (a constituent of cement) in the leaves and copper (13.68 μmol mol-1) in the seeds. Furthermore, the plants showed a low uptake of iron (a prominent constituent of cement) from the iron-rich polluted site. The heavy metals present in cement dust also induced a deficiency in phosphorus, magnesium and ammonia; and synergistically attracted the presence of other heavy metals such as zinc, copper, lead, nickel, chromium, silver and cadmium in significantly high quantities (p = 0.05).
  C.E. Umebese and O.M. Onasanya
  The composition of minta effluent and its effect on the phenology, growth and yield of seeds of Vigna unguiculata (L.) Walp var. Ife brown, were investigated. The effluent was highly acidic (pH 3.74) and the concentrations of Ca, Mg and SO4 were appreciable (107.07, 351.47 and 221.11 mg L-1, respectively). Germination of seeds sown in effluent was delayed by a day, reduced by 2% and not synchronous. Phenological investigations showed that plants grown in soil watered with effluent had 4-5 days delay in staking, bud formation, flower initiation, fruiting, pod ripening and plant senescence. These plants showed significant reductions in plant height, leaf area, shoot biomass and pod biomass (p<0.05). Furthermore, seed yield and 100 corn weight of treated plants were low. Minta effluent has low agropotential.
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