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Articles by O.O. Oyelakin
Total Records ( 3 ) for O.O. Oyelakin
  S.A. Ogunbayo , D.K. Ojo , A.R. Popoola , O.J. Ariyo , M. Sie , K.A. Sanni , F.E. Nwilene , E.A. Somado , R.G. Guei , D.D. Tia , O.O. Oyelakin and A. Shittu
  Morphological and molecular characterization of ninety-six landrace rice (Oryza sativa L.) accessions including six checks collected from four regions (North-West, North, West and Central-West) of Cote d’Ivoire were assessed using 14 agro-botanical traits and 10 Randomly Amplified DNA Polymorphisms (RAPDs) primers, respectively. Accessions were evaluated in a field experiment in an augmented experimental design with three replicates. The aim of the research was to study variations and to select lines that could be used as potential parents in future breeding programs. A principal components plot and a dendrogram based on distance between genotype cluster groups for mean values of the morphological variables were used to group the accessions. Genetic relatedness among accessions based on RAPD molecular marker was also presented in form of a dendrogram generated by clustering analysis using the Unweighted Pair Group Method with Arithmetic mean (UPGMA). The relative effectiveness of the RAPD markers compared to botanical descriptors in assessing diversity among the accessions was investigated. Clustering analysis technique using NTSYS classified the 96 landrace accessions into 8 morphological groups whereas PCA re-ordered the accessions into three broad groups that had within cluster similarities and inter-cluster differences in morphological variations. Reaction products (bands) of the RAPD analysis were highly polymorphic, more discriminatory and informative as they were able to differentiate more pairs of accessions than the botanical descriptors. Apart from checks, highest grain yield (2316 g/plot) was observed for accessions 46 (DNN 184) with an average of 12 filled tillers, plant height of 136 cm and medium maturity date of 136 days. It was observed that number of total and filled tillers per se was not a function of yield but rather, these traits were significantly associated with plant height and maturity date. Although, landrace rice accessions in Côte d’Ivoire is associated with relatively narrow genetic base, positive heterosis could be promoted if any of the Gagnoa (GGA) accessions from Central West of the country is used in a future hybridization program with Danane (DNN) accessions from west because of genetic distance between members of the two groups.
  R.O. Onasanya , O.P. Aiyelari , A. Onasanya , F.E. Nwilene and O.O. Oyelakin
  An experiment to determine the effects of different levels of nitrogen and phosphorus fertilizers on the growth and yield of maize was conducted between June and October, 2007 at the Teaching and Research Farm of the Federal University of Technology, Akure. The experiment was laid out in a Randomized Complete Block Design (RCBD) consisting of twelve treatments with three replicates. The treatments were, 0 kg N ha-1 + 0 kg P ha-1 (T1), 60 kg N ha-1 + 0 kg P ha-1 (T2), 120 kg N ha-1 + 0 kg P ha-1 (T3), 0 kg N ha-1 + 20 kg P ha-1 (T4), 0 kg N ha-1 + 40 kg P ha-1 (T5), 0 kg N ha-1 + 60 kg P ha-1 (T6), 60 kg N ha-1 + 20 kg P ha-1 (T7), 60 kg N ha-1 + 40 kg P ha-1 (T8), 60 kg N ha-1 + 60 kg P ha-1 (T9), 120 kg N ha-1 + 20 kg P ha-1 (T10), 120 kg N ha-1 + 40 kg P ha-1 (T11) and 120 kg N ha-1 + 60 kg P ha-1 (T12). The result of the study showed that application of 120 kg N ha-1 + 0 kg P ha-1 and 60 kg N ha-1 + 40 kg P ha-1 significantly increased the growth of maize than other treatments. The application rate of 120 kg N ha-1 +40 kg P ha-1 significantly (p = 0.05) enhanced grain yield. The study therefore suggests that, for optimum grain yield, 120 kg N ha-1 + 40 kg P ha-1 should be applied particularly in the study area and its environment.
  L.A. Ogunkanmi , W.O. Okunowo , O.O. Oyelakin , B.O. Oboh , O.O. Adesina , K.O. Adekoya and O.T. Ogundipe
  The genus Corchorus is one of the most important fibre crops, in order to improve this largely neglected crop, it is essential to understand the pattern of diversity in this important crop species. In this study, inter and intra genetic diversity analysis of 40 genotypes from C. olitorius and 40 genotypes from C. incisifolus was carried out using sixteen RAPD markers. The molecular study of the two species classified C. olitorius into two main clusters with five genotypes unresolved while there are three clusters with all the genotypes clearly separated in C. incisifolus. The results of both inter and intra genetic diversities revealed a higher level of allelic diversity in C. incisifolus than in C. olitorius. In the morphological study, higher mean and higher upper range values for all the five quantitative traits in C. incisifolus indicated its superiority over C. olitorius. However, both species show divergent attributes in four qualitative traits but similar in two characters. This could be attributed to higher level of natural outcrossing in C. incisifolus relative to that of C. olitorius. Results of this study therefore show that RAPD marker is a useful tool for assessing inter and intra genetic diversity in the two species of Corchorus. Therefore selection could be made from the diverse genotypes as parents for crosses designed for breeding improved jute cultivars and for producing mapping populations for QTL analysis.
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