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Articles by O.T. Ogundipe
Total Records ( 8 ) for O.T. Ogundipe
  T.O. Adeyemi and O.T. Ogundipe
  For any meaningful genetic research, basic techniques of biotechnology must be in place, one of which is isolation of DNA. Although several protocols exist for the extraction of plant DNA, a major but limiting step in genetic research is poor extraction. This study was conducted in order to isolate pure genomic DNA from some members of family Sapindaceae in Africa using a rapid and efficient method. Fresh and dried young leaves from 56 species were sampled for extraction of genomic DNA. The methodology employed includes a modification in the quantity of plant materials and reagents used and excluded the use of ultracentrifugation techniques. The result revealed genomic DNA with absorbance ratio ranging between 1.4 and 2.0 for all the taxa sampled. Hence, it was concluded that the modified protocol yielded genomic DNA suitable for PCR based analysis.
  O.H. Adekanmbi and O.T. Ogundipe
  In order to aid pollen identification, which is the bedrock of palynological studies, 14 plant species belonging to 4 families were subjected to standard palynological sample preparation. Taxa in the collection belong to the families Acanthaceae, Amaranthaceae, Apocynaceae and Aracaceae. Pollen grains belonging to the family Acanthaceae are mostly prolate in equatorial view and trigonal to circular in polar view. Family Amaranthaceae pollens are eurypalynous comprising of different morphological types of pollen, ranging from inaperturate to polyporate. Genera in the family Apocynaceae exhibit palynological extremes indicated by variety in the shape of the pollen grains, aperture, size and ornamentation of the studied species. Pollen grains in Aracaceae also exhibit variations ranging from monocolpate to trichotomosulcate nature of aperture. Light micrographs, detailed descriptions of the species and where possible Scanning Electron Micrographs are provided. It is established from this study that identification of palynomorphs should not pose a problem to the application of palynology even in fields other than biostratigraphy such as forensic studies, mellisopalynology, and medicine (e.g., alleviation of pollinosis).
  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.
  E.U. Durugbo , O.T. Ogundipe and O.K. Ulu
  Rich and well preserved assemblages of pollen, spores, and organic walled dinoflagellate cysts in 96 and 89 samples of Wells A and B from the Western Niger Delta Nigeria are recorded. The dominance of savanna pollen over wet climate indicators (mangrove, freshwater swamp species, brackish water swamp species and Palmae) and the preponderance of the dinocysts Polysphaeridium zoharyi and Operculodinium centrocarpum, species adapted to very saline and warm waters respectively, with abundant fungal spores dominated by Exesisporites sp., gives credence to a predominantly dry climate and lowered sea level during the Pliocene-Pleistocene (ca. 5.0-1.3 Ma) in the Gulf of Guinea. The most pronounced glacial events were around the 2.0-2.7 Ma, as well as between the 2.7-3.4 Ma.
  T.O. Adeyemi , O.T. Ogundipe and J.D. Olowokudejo
  Members of the family Sapindaceae provides various benefits in combating increasing malnutrition and poverty in West Africa. Due to their multiple uses, their high nutritional and medicinal value, members of Sapindaceae have been identified as one of the most important forest species to be conserved and valued in Africa. Therefore, it is important to study the potential future distribution of this species and determine strategies for conservation. In order to achieve these, suitability of sites in Africa was evaluated for potential conservation using spatial environmental data in MAXENT modelling framework. A total of 153 geo-referenced records of Sapindaceae were assembled from herbarium records and fieldwork and climatic data were acquired from the Worldclim Database. The main variables that contributed towards predicting the species distribution were annual precipitation and temperature seasonality. Results suggest that the distribution model was excellent with training AUC value of 0.974 and test AUC value of 0.960 confirming the wide distribution of Sapindaceae in West Africa. Also, the environmental variables that affected the model the most are minimum temperature of the coldest month (35.4%), precipitation of the coldest quarter (16.9%) and precipitation of wettest month (14.9%). Recommendations for different conservation strategies include in situ conservation in Protected Areas; ex situ conservation in seed banks and conservation through ‘sustainable utilization’.
  T.O. Adeyemi , O.T. Ogundipe and J.D. Olowokudejo
  Generally, biodiversity is being threatened globally by climate change as well as human activities and this has aroused concerns about the conservation status. This study was designed with the aim of searching for existing, new and unrecorded plant species of the family Sapindaceae in West Africa so as to better understand the extent of diversity and distribution of the species in the family remaining in existence and conserve them for maximum use. The methodology employed include: field sampling, preservation of voucher specimens in secured repositories and DNA conservation of the collected samples. It was observed that the family Sapindaceae are represented by 26 genera and 104 species in western Africa. The most species rich regions are Nigeria (47 taxa), Cameroon (45 taxa) and Ghana (25 taxa). Southern highlands of Nigeria have the highest number of species followed by western river banks of Ghana. Taxa shared are highest between Nigeria and Ghana and endemism is highest in the western regions with 9 species endemic to the mountains and coasts. High quality genomic DNA were obtained and deposited in the DNA bank at the Royal Botanic gardens Kew. This research can be seen as a key step in the conservation of the family Sapindaceae as it reveals that most of the plants are endangered mainly due to deforestation and agricultural practices in forest reserves across West Africa.
  A.D. Oshingboye , T.O. Adeyemi and O.T. Ogundipe
  Melons belong to the family Cucurbitaceae; it is one of the most important cash crops globally. Their demand is in a very high quantity, especially here in Nigeria. In order to improve the yield of this highly demanded crop, a study was under taken to ascertain the pattern of its genetic diversity. During this study, eighteen melon cultivars samples grown in south western Nigeria was used; Cucumis melo, Citrullus lanatus and Lagenaria siceraria species. They were investigated using both seed morphology and molecular characters. However, the seed morphological characters revealed, they are sharply pointed with elliptical/oval shape. Analysis of total genomic DNA extracted using CTAB protocol on 1% agarose revealed high molecular weight DNA bands in 88.89% of the samples. While studies on their genetic variation investigated using RAPD analysis, with three primers revealed samples have a wide genetic base with monomorphic bands, which were used to generate UPGMA dendograms. The dendograms showed the examined melons are monophyletic with sample AD001 and AD002 showing distinct morphometric evaluation with 18.00 and 16.94 similarity coefficient, respectively and samples AD003 and AD004 have a closer similarity coefficient at 2.06. Basically, in this study, we have investigated the extent of variation and of relatedness among the 18 melon cultivars, which can now afford breeders the opportunity to make selections on how to improve on the breeding of melon cultivars. However, this research serves as a basis for further characterization of the melon population.
  M.O. Sifau , L.A. Ogunkanmi , K.O. Adekoya , B.O. Oboh and O.T. Ogundipe
  The common name “Eggplant” is given to vegetables of several Solanum L. species that are important for human diet and health. The taxonomy and phylogenetic relationships among these taxa are currently unclear due to its large size and tropical center of diversity. This study assessed the genetic diversity in forty nine eggplant and related Solanum species’ genetic resources in Southern Nigeria using one nuclear (ITS) and two chloroplast genes. Analysis of DNA sequence data from the three regions (ITS, trnl C-trnl D and trnl E-trnl F) gave a high level of genetic variability (polymorphism) among the samples studied. A bootstrap value of 100 was observed between S. macrocarpon L. and S. torvum Sw. and between S. macranthum A. Rich. and S. indicum L., closely followed by a value of 99 between S. aethiopicum L. and S. dasyphyllum Schum. and Thonn. All these are indications of a close relationship between these species and a possibility of a common ancestor is strongly proposed. Solanum torvum was often separated out from S. melongena and even where they grouped together they have a low bootstrap value of 3 which is an indication of distant relatedness. The high level of intra and inter specific variations displayed within eggplant accessions and between its relatives as reported in this study could be effectively used in genetic improvement of cultivated eggplant varieties as well as in situ and ex situ conservation.
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