Stephen Oyedeji
@unilorin.edu.ng
Senior Assistant Professor, Faculty of Life Sciences
University of Ilorin
A Senior Lecturer in the Department of Plant Biology, University of Ilorin. He has taught courses in plant biology for over 10 years. He has supervised over 70 undergraduate thesis and 6 Masters thesis. He has won several awards and scholarships. He has travelled on research collaborative purposes to countries in Asia and Europe.
EDUCATION
Ph.D Botany (with specialization in Plant Ecology and Tuurfgrass Management)
M.Sc. Botany
B.Sc. Botany
RESEARCH, TEACHING, or OTHER INTERESTS
Plant Science, Ecology, Evolution, Behavior and Systematics, Agronomy and Crop Science, Agricultural and Biological Sciences
Scopus Publications
Scopus Publications
S. Oyedeji, C.O. Ogunkunle, S.A. Adeniran, O.O. Agboola, and P.O. Fatoba
CRC Press
S. Oyedeji
CRC Press
David A. Animasaun, Peter A. Adedibu, Gabriel K. Olawepo, and Stephen Oyedeji
Elsevier
David Adedayo Animasaun, Chinaza Davies Nnamdi, Omotola I. Ipinmoroti, Stephen Oyedeji, Emmanuel A. Olonya, Ramar Krishnamurthy, and Joseph Akintade Morakinyo
Bogor Agricultural University
This study characterized, identified and conducted phylogenetic analysis on fungi contaminants in vitro bananas based on the sequence of inter-space (ITS) regions. Genomic DNA was extracted from the pure culture of fungi contaminants, amplified and sequenced using ITS1 and ITS4 markers. Analysis of the sequences using MEGA 7 Software at higher similarity sequence identified five Aspergillus spp., three Penicillium spp., one each of Fusarium, Trichoderma and Cladosporium as the contaminants. The genetic distance between the fungi species was 0.205, which suggests a homogeneous substitution between the sequences, and thiamine was the most stable. The fungi clustered in three major groups at 0.10 genetic distance, subdivided into five clusters. A cluster and sub-cluster consisting of five Aspergillus strains; a major cluster of three Penicillium strains; a cluster comprising of Fusarium chlamydosporum and Trichoderma viride; and a sole fungi Cladosporium tenuissimum. The Aspergillus group were phylogenetically related to A. flavus and A. parvissclerotigenus, the identified Penicillium spp. were closely related to Penicillium citrinum while the detected Cladosporium aligned with Cladosporium tenuissium and Phoma multirostrata. The information provided by this study could be utilized to develop a specific and compelling sterilization protocol to minimize the rate of contamination during in vitro culture procedures.
Clement O. Ogunkunle, Mariam A. Akanbi-Gada, Stephen Oyedeji, and Mayank Varun
Elsevier
CO Ogunkunle, MA Jimoh, S Oyedeji, Mayank Varun, and GO Okunlola
Elsevier
David Adedayo ANIMASAUN, Stephen OYEDEJI, Latifat Bukola MUSA, Peter Adeolu ADEDIBU, and Olabisi Fatimo ADEKOLA
University of Ljubljana
This study evaluates eleven sesame accessions in Nigeria for performance and genetic diversity using morpho-agronomic traits, chlorophyll contents and nutrient composition in a complete randomized experimental design with five replicates. The results showed ‘Igboho Black’, ‘02M’ and ‘Kenan 4’ had the best growth attributes. Although ‘NGB0090’ and ‘Exsudan’ matured early, ‘E8’, ‘Bogoro Local’ and ‘Kenan 4’ had the best yield attributes. Seeds produced were predominantly milky-white, an accession had black seeds, while three produced white seeds. Plant height positively correlated with number of leaves and leaf area as well as peduncle length. Days to 50 % flowering positively correlates with days to maturity. So also the number of capsule per plant, capsule dimension and seeds per capsule. The moisture content in seeds of the accessions was < 3.5 %, ash (4.5-5.9 %), crude protein (5.3-7.4 %), fat and oil (53.6-60.5 %), and carbohydrate < 30 %. Out of the eight components that accounted for the observed variations, the PC-1 and PC-2 contributed 65.42 %. The dendrogram revealed that ‘NGB00960’ and ‘NGB00963’ which had ‘’Kenan 4’ as a distant member are the closest relatives, while ‘NGB00390’ and ‘01M’ are the most diverse. The study concludes that the accessions are genetically and phenotypically varied and the existing diversity can be harnessed for selecting high yielding and adaptable variety for the development of improved cultivars.
S. Oyedeji, O. O. Agboola, D. A. Animasaun, C. O. Ogunkunle, and P. O. Fatoba
Springer Science and Business Media LLC
S. Oyedeji, O.O. Agboola, T.S. Oriolowo, D.A. Animasaun, P.O. Fatoba, and A.O. Isichei
Walter de Gruyter GmbH
Abstract This study assessed early-season effects of spontaneous wildfires on soil fertility and weed diversity in two managed plantations – cashew and teak – in Ilorin, Nigeria. Soil pH and nutrients in the topsoils and subsoils of burned and unburned plantations plots after a spontaneous wildfire were analysed. Species diversity and similarity were determined based on the composition and abundances of weed flora two months post-fire. The fire effects on soil nutrients and weed composition in the plantations were evaluated using the canonical correspondence analysis. Burns incidence significantly improved the organic carbon, organic matter, and Ca contents while reducing total N and Mg in both plantations. Twenty-eight weed species were distributed in 9 angiosperm families. Fire differently affected weed composition, abundance and diversity in the plantations. Burning improved soil organic carbon and organic matter contents and restricted Tephrosia bracteolata, Desmodium tortuosum, Daniellia oliveri, Senna obtusifolia and Zornia latifolia to the burned cashew plantation. The occurrence of Euphorbia heterophylla, Eriosema psoraleoides and Crotalaria retusa in the burned teak plantation was associated with a direct fire effect on soil Na and Ca contents. Burning influenced soil nutrients in the studied plantations, but weed diversity increased in the teak plantation and was reduced in the cashew plantation.
David Adedayo Animasaun, Azeez Afeez, Peter Adeolu Adedibu, Feyisayo Priscilla Akande, Stephen Oyedeji, and Kehinde Stephen Olorunmaiye
The Korean Society for Plant Biotechnology
Clement Oluseye Ogunkunle, Stephen Oyedeji, Hussein Kehinde Okoro, and Vincent Adimula
Elsevier
Oludare O. Agboola, Olusanya A. Olatunji, and Stephen Oyedeji
Informa UK Limited
ABSTRACT Evidence of the impacts of land-use change on soil biological activities, a determinant of nutrient cycling in soil, will provide a better understanding of soil health and productivity. The study investigates temporal changes in soil chemical and microbial properties in a forest converted to oil palm plantation. Soil samples from four locations: native forest and Elaeis guineensis plantations of 2-, 13- and 14-year were collected. Total carbon C and N were significantly higher (p < 0.05) in the native forest (NF) followed by 14- and 13-year E. guineensis plantations respectively. Microbial biomass carbon (MBC) and nitrogen (MBN) in NF were significantly higher (p < 0.05) than in the E. guineensis plantations. There were no significant differences in the microbial biomass phosphorus (MBP) among the E. guineensis plantation of all ages. The qCO2 in the 13- and 14-year E. guineensis plantations was higher than in NF and 2-year E. guineensis plantation. There was a positive correlation between MBC, MBN, MBP and pH, P, TC, and TN. These results indicated that conversion of native forest to E. guineensis plantation affected soil nutrient and microbial properties. And there could be a return to healthy soil condition as age of E. guineensis plantation increased.
David Adedayo Animasaun, Stephen Oyedeji, Kehinde Stephen Olorunmaiye, Musibau A. Azeez, Idowu Abdulfatah Tijani, and Joseph Akintade Morakinyo
Walter de Gruyter GmbH
Abstract The present study characterizes seed-related traits, phytochemical, physiochemical parameters and fatty acid profile of shea (Vitellaria paradoxa) seeds collected from the Kosubosu, Fufu and Sare areas of Kwara State, Nigeria to determine the effects of microclimate on seed morphology, biochemical and oil constituents. Seed morphological data were analyzed for variability. Seed oil was extracted for phytochemical constituents, physicochemical properties, and fatty acid profiling by gas chromatography equipped with mass spectrometry (GC/MS). Results showed intra and inter-locational variations in seed characters. Most fruits had 1–2 seeds. Seeds were predominantly brown and very few were dark brown. Phytochemicals and physicochemical parameters of the seed oil varied with place of collection. Alkaloid, saponin, tannin and phytate contents ranged between 0.79–0.84, 1.20–1.26, 1.48–1.56 and 0.15–0.18 mg g−1 respectively. The density of the oil was less than that of water, acid value ranged from 10.58–13.56 mg KOH g−1 and iodine values were between 36.63 to 40.32 g I2 (100 g)–1. Saponification values lie between 160.39 and 184.14 mg KOH g−1; and free fatty acid was within 5.32–6.81 %. Peroxide, ɑ-tocopherol, total phenol and oxalate values as well as viscosity of the oil also varied; however, refractive index was similar. Ethyl oleate and octadecanoic acids were present and most abundance in all the locations, while glycidol stearate was only found in Fufu samples with three other fatty acids. Five fatty acids were present in Kosubosu, while Sare had only two. The results obtained in the present study indicate that shea oil could be used for medicinal, nutritional and industrial purposes. Since seed characters, phytochemical, physicochemical and fatty acid compositions varied with the microclimate, environmental and micro-ecological conditions should be considered when collecting seeds for oil utilization.
D.A. Animasaun, S. Oyedeji, R.S. Ingalhalli, and R. Krishnamurthy
Society for the Advancement of Horticulture
This study assessed the genetic diversity of six ornamental ferns in parks and gardens in Nigeria using inter-simple sequence repeat (ISSR) markers. Genomic DNA were extracted from the samples and Polymerase Chain Reaction (PCR) was performed using seven ISSR markers. The elcetrophoregram showed amplicon size ranged from 100bp-1Kb among the ferns. A total of 87 bands were generated with 71.26 % polymorphism and 28.73 % monomorphic bands. The average number of band per primer was 12.4 and polymorphism range was between 31.23-100 %, the highest polymorphism was obtained with ISSR2. The mean Nei’s genetic diversity was 29 % while the Shannon’s index was 43.5 %. The pair of Adiatum capilus-veneris and Pteris acanthoneura had maximum genetic distance of 0.6592 while A. capilus-veneris and A. furcans are the closest species. At genetic similarity of 78 %, the cluster analysis revealed two major groups. Group-1 comprised of four species, where P. acanthoneura is a distant member, the other three species in the group are closely related. Group-2 on the other hand had two closely related Adiantum species. The study concludes that ISSR markers are effective in the genetic study of the ferns and the genetic diversity information provided could be utilized for selection, improvement and conservation of the ornamental plants.
Clement O. Ogunkunle, Kamaldeen Mustapha, Stephen Oyedeji, and Paul O. Fatoba
Elsevier BV
Stephen Oyedeji, Friday Onuche, David Animasaun, Clement Ogunkunle, Oludare Agboola, and Augustine Isichei
National Library of Serbia
The ecological impact of fire regimes on plant diversity and soil fertility has become a subject of intense discussion, especially in savannas where recurring incidences are common. This study assessed the short-term effects of early-season fire on herbaceous composition, dry matter yield and soil fertility in the Guinea savanna belt of Nigeria. Data on ground cover, dry matter yield (DMY) in plants and concentrations of C, N, P, K, Ca and Mg in soil were collected from 10 delineated subplots in the burned and unburned zones of four sites after annual wildfire had occurred. Ground cover was significantly higher in the burned zones, increasing progressively from January to April (dry season). Eleven herbaceous species in addition to 2 tree seedlings occurred and represented families of Asteraceae, Cyperaceae, Fabaceae and Poaceae. Digitaria nuda, Brachiaria lata, Daniellia oliveri and Aeschynomene indica were limited to the burnt zones while Cyperus tuberosus, Mariscus alternifolius and Rottboellia cochinchinensis were restricted to the unburned zones. DMY ranged from 0.32 g m-2 (Desmodium tortuosum) to 52.96 g m-2 (Megathyrsus maximus). Average biomass in the burned and unburned sites was 35.86 g m-2 and 28.42 g m-2, respectively. Soil C, N and P concentrations decreased (positive deterioration index - DI), while those of K, Ca and Mg improved (negative DI) in the burned sites. Burning altered the growth (ground cover) and composition of plant species in the short term, and could significantly influence soil nutrient dynamics in the long term, especially with recurring fire events.
C. O. Ogunkunle, L. B. Suleiman, S. Oyedeji, O. O. Awotoye, and P. O. Fatoba
Springer Science and Business Media LLC
Stephen Oyedeji, David Adedayo Animasaun, Abdullahi Ajibola Bello, and Oludare Oladipo Agboola
Hindawi Limited
The study compares the growth, yield, and proximate composition of Amaranthus hybridus, Amaranthus cruentus, and Amaranthus deflexus, grown with poultry manure and NPK in relation to the unfertilized soil of Ilorin, Nigeria. Viable seeds of the Amaranths raised in nursery for two weeks were transplanted (one plant per pot) into unfertilized soil (control) and soils fertilized with either NPK or poultry manure (PM) at 30 Kg ha−1 rate arranged in randomized complete block design with four replicates. Data were collected on plant height, stem girth, number of leaves, leaf area, and number of branches from 1 week after transplanting (1 WAT). Fresh weight, dry weight, and proximate composition were determined at 6 WAT. Except for the length, breadth, and number of leaves, the order of growth parameters and yield in the three Amaranthus species was NPK > PM > control. NPK grown Amaranthus species had the highest protein while PM-grown vegetables had the highest ash content. Crude fibre in A. cruentus grown with PM was significantly higher than NPK and the control. The NPK treatment of A. hybridus and A. deflexus had the highest crude fibre content. NPK and PM favoured growth and yield of the Amaranthus species but influenced proximate composition differently.
Stephen OYEDEJI, Augustine Onwuegbukiwe ISICHEI, and Adekunle OGUNFIDODO
Turkish Journal of Field Crops
The study assessed the performance of Axonopus compressus, Chysopogon aciculatus, Sporobolus pyramidalis, Eleusine indica and Dactyloctenium aegyptium in turf establishment. The five grass species planted in sole and mixed stands were varied with the legume - Desmodium triflorum. Ground cover differed significantly among grass species and their mixtures from 4 - 11 weeks after planting (WAP) but ground cover in the legume and no legume subplots were not significantly different from 4 – 6 WAP. Eleusine, Axonopus and Dactyloctenium and their mixtures had higher ground cover than those of Sporobolus and Chrysopogon. There were significant differences in ground cover among grasses and mixtures at 3 and 6 weeks after clipping (WAC), and grasslegume subplots and subplots without the legume were different at 3 and 4 WAC. Recovery weeks after trampling was faster in sole stands and mixtures with Axonopus and Eleusine, indicating they are better adapted to trampling