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Articles by S.A. Ogunbayo
Total Records ( 3 ) for S.A. Ogunbayo
  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.
  M. Sie , Y. Sere , S. Sanyang , L.T. Narteh , S. Dogbe , M.M. Coulibaly , A. Sido , F. Cisse , E. Drammeh , S.A. Ogunbayo , L. Zadj , B. Ndri and B. Toulou
  The immense potential of the lowlands in West and Central Africa for durable intensification of rice cropping have not been realised due to biotic and abiotic constraints. There is a need to replace existing rice varieties with others that are better adapted to the lowland conditions. After the success of the upland interspecific varieties, Africa Rice Center (WARDA) and its partners developed NERICA varieties suitable for irrigated and rainfed lowlands. The stable varieties resulting from this work were evaluated under preliminary yield trials in eight countries at 19 sites. The entries included 61 interspecific (O. glaberrima x O. sativa indica) varieties and 9 intraspecific (O. sativa indica x O. sativa indica) varieties. The aim of the study is to introduce new lowland NERICAs through a participatory approach and to identify ideotypes that are adapted to lowland conditions. Variations did exist among the 73 rice varieties with respect to the five traits that were evaluated. Total number of tillers, panicle number and flowering dates were observed to greatly influence the yield among the 73 varieties that were evaluated. A principal components plot clustering analysis were used to group the accessions. The interspecific varieties formed the most interesting group and have a better capacity for adaptation to the diversity of lowlands. They have acceptable yields, sometimes higher than those of intraspecific varieties and checks. Thus, most lowland NERICAs varieties tested in three ecologies could produce more than 5 t ha-1. The results obtained were quite encouraging and showed that, the varieties possess good agronomic traits that are well adapted to intensified lowland rice farming. The recent naming of some of these interspecific varieties as NERICA-L (New Rice for Africa Lowland) by Africa Rice Center has confirmed that they compare well with the traditional varieties. Thus, from this study, we now have a new set of interspecific varieties that are adapted to lowland conditions and which the national research programs can use in various tests for satisfying farmers` needs.
  Kayode A. Sanni , O.J. Ariyo , D.K. Ojo , G. Gregorio , E.A. Somado , I. Sanchez , M. Sie , K. Futakuchi , S.A. Ogunbayo , R.G. Guei and M.C.S. Wopereis
  Genotype by Environment Interaction (GEI) is a major complications in plant breeding. We used Additive Main Effects and Multiplicative Interaction (AMMI) to evaluate the effects of GEI in NERICA rice genotype and their adaptation in two years at three locations; Ibadan-7°30’ N, 3°58’ E, 210 m.a.s.l. (Nigeria), Cotonou-6°24’ N, 2°19’ E, 15.5 m.a.s.l. and Deve-6°48’ N, 1°47’ E, 72 m.a.s.l. (Benin Republic). Twenty two rice genotypes were grown in 2005 and 2006 under upland condition, using randomized complete block design with three replications. Main effects due to environments (E), genotypes (G) and GxE interaction (GEI) were significant (p<0.01), with the highest variation of 43.1% accounted for by environmental effects. The first four Interaction Principal Component Axes (IPCA1, 2, 3 and 4) were significant (p<0.01) and cumulatively contributed 98.5% of the total GEI. AMMI biplot accounted for 91.4% of the total sum of squares. The stability study indicated that NERICAs 3, 10, 11 and 18 could be considered stable in any of the environments, due to their low interactions. However, NERICA 11 was the most promising of the genotypes, with high yield (5.15 t ha-1) and a broad environmental adaptation.
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