Faculty of Science

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Browsing Faculty of Science by Author "Adedeji, Olubukola"

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    Flowering Sequence Duration and Fruit Production in the Species of Emilia (Senecioneae, Asteraceae)
    (2007) Adedeji, Olubukola
    The flowering sequence duration, fruit production and percentage of fruit-set per capitulum of the three Emilia Cass species in Nigeria were investigated. There were similarities, differences and overlaps in the duration of the different stages of the flowering phase among the three species. Flowering of E. praetermissa, the allotetraploid hybrid of E. coccinea and E. sonchifolia, starts faster than of its parental species. Fruit production performance was found to be associated with a number of vegetative and reproductive characteristics of Emilia plants. Fruit production and percentage of fruit-set per capitulum were highest in E. praetermissa. E. coccinea achenes had a shorter post-pollination period on the p1ant: Fruit set and production of Emilia species are discussed.
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    Leaf Epidermal Studies of the Species of Emilia Cass. (Senecioneae, Asteraceae) in Nigeria
    (2004) Adedeji, Olubukola
    A taxonomic study of Emilia Cass. in Nigeria was conducted in search of useful and stable anatomical characters for the identification of the species. Stomatal type and index indicates that Emilia praetermissa is a hybrid between E. coccinea and E. sonchifolia. Larger cell size in all studied size attributes supports E. praetermissa as an allotetraploit. Trichome type, stomata type, stomata shape and size attributes are all characters of E.sonchifolia and E. praetermissa that were consistently close in resemblance and values to suggest E. sonchifolia as the closer parent of E. praetermissa exerting gene dominance. This would also suggest introgression between E. sonchifolia and E. praetermissa.
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    Morphological Agrobotanical and Reproductive Studies in 35 Accessions of Panicum Maximum Jacq. in South Western Nigeria
    (Academic Journals, 2006) Adedeji, Olubukola; Faluyi, Julius Olaoye
    Panicum maximum Jacq. in Southwestern Nigeria occur in two distinct field forms. Thirty-five accessions representing these two field forms were collected and studied for their morphological, agrobotanical and reproductive biology characters. The plant is observed to be an aggressive colonizer. It flowers early as days to first heading range from 43 – 93 days. They are poor seeders and propagation is predominantly vegetative through root-stocks and roots from the nodes. The variations in mean pollen size and percentage fertility emphasize the influence of genetic factors on pollen size and fertility. Pollen fertility is low in all the accessions studied.
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    Morphological Studies in the Genus Emilia (Senecioneae, Asteraceae)
    (2006) Adedeji, Olubukola
    A morphological study of the three species of Emilia Cass. in two different ploidy levels in Nigeria was performed. Both qualitative and quantitative characters were recorded. Characters of taxonomic value include the habit, bloom colour, colour and pubescence of the stem, differences in the margin of the leaves, corolla tube, style and stigma colours, pedicel length, capitulum length and breadth, the quantitative relationship of floret to involucral bracts, floret number, fruit number and size. E. praetermissa, the allotetraploid hybrid, is closely related to E. coccinea and E. sonchifolia – the other diploid relative. E. praetermissa has intermediate morphological and ecological characteristics. The morphological characters indicating E. praetermissa as an allotetraploid hybrid of E. coccinea and E. sonchifolia are bloom colour, corolla tube colour, and pedicel length. E. praetermissa behaves like a true allopolyploid in its habitat and ecological preferences. A new key to the Emilia species in Nigeria is included.
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    Palynology of the Genus Stachytarpheta Vahl. (Verbenaceae)
    (2010) Adedeji, Olubukola
    The exine morphology of pollen grains of Stachytarpheta indica (Linn.) Vahl Stachytarpheta cayennensis (Rich.) Vahl and Stachytarpheta angustifolia (Mill.) Vahl is reported. This study was carried out with a light microscope. Pollen grains from fresh anthers were collected and aceolysed. Statistical analysis used to analyse the data collected include cluster analysis, correlation analysis, similarity and distance indices. The pollen grains are spheroidal to oblate to sub-oblate in shape. They are aperturate, both colpate and porate. Tricolpate types occur most frequently, acolpate, monocolpate, bicolpate and tetracolpate types less frequently. The rnulticolpate and multiporate attributes in all the species indicate that the genus is not primitive in evolutionary history and this species probably, evolved around in the same time. According to the size, the pollen grains of the genus falls into groups permagna (pollen diameter 100-200 υm) and giganta (pollen diameter greater than 200 υm). S. cayennensis and S. angustifolia belong to group perrnagna and S. indica only in the group giganta. This separates S. indica from the other two species. The large pollen grain size in the genus clearly supports the fact that the flowers in the genus are more insect-and-bird pollinated than wind pollinated. The similarity and distance indices of the species showed that S. cayennensis and S. angustifolia are the closest. S. indica is closer to S. angustifolia but farther from S. cayennensis.
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    Physicochemical Properties of Four Tomato Cultivars Grown in Nigeria
    (Blackwell, 2006) Adedeji, Olubukola; Taiwo, Kehinde A.; Akanbi, Charles T.; Ajani, Ruth
    The physicochemical characteristics of tomato fruits from three commercial cultivars available in the local market were compared with a wild cultivar. The results showed that the Ibadan-Local and Wild cultivars had a higher fruit yield than Ife-1 and Roma-VF cultivars. The wild cultivar has a high skin and seed content. The shape of the fruits varied from spherical to pear-like. Physicochemical properties such as specific gravity, pH, titratable acidity, ash and refractive index did not vary significantly while total solids, longitudinal (stem  blossom end) and cross-sectional diameters (transverse diameter), vitamin C and reducing sugars were significantly different (P > 0.05) among the cultivars investigated. The results showed that the wild cultivar has attributes (i.e. physicochemical characteristics) comparable to commercial cultivars to recommend it to breeders for cultivation.