Browsing by Author "Faluyi, J. O."

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    Foliar Epidermal Studies of Thirty-Five Accessions of Panicum Maximum Jacq. in Nigeria
    (Today & Tomorrow's, 2001) Adedeji, O.; Faluyi, J. O.
    The foliar epidermis of 35 accessions of Panicum maximum, were studied. The results show that all the accessions are amphistomatic possessing paracytic type of stomata on both the adaxial and abaxial epidermal surfaces. The subsidiary cells are predominantly triangular in shape but often low-dome too. The intercostals short cells are mostly solitary but occasionally paired, often associated with silica containing cells. Prickle hair are generally absent on the costal zone of the abaxial surface but present on the costal zone of the adaxial surface and intercostal zones of both surfaces at different frequencies. The microhair also occurs at different frequencies. Accession 35 collected from a transition zone marking the southern end of major distribution of P. maximum is unique in having the biggest stomata size and 3 - 4 stomata bands on the intercostal zone. The implication of this as related to the ecologies of' the Sahel, Guinea and Sudan Savanna Zones of Nigeria is discussed.
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    Forage Yield and Nutritive Value Assessments in Some Accessions of Panicum Maximum Jacq.
    (2003) Adedeji, O.; Faluyi, J. O.
    Twenty accessions of Panicum maximum Jacq.were assessed for their forage yield and nutritive value attributes. Results revealed that number of tillers per plant stand and dry matter yields of culm, leafy portion and above ground plant were the parameters involved in the determination of forage yield. The nutritive value studies showed that Crude Protein, Potassium, Nitrogen, Sodium and Calcium concentrations were within the recommended range for animal feed, while Magnesium and Phosphorus levels were below the recommended range.
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    Genetic Analysis of Pigmentation in a Cultivar of Rice (Orilzu sativa Linn)
    (1997) Faluyi, J. O.; Oloyede, F. A.
    Two cultivars of Oryza sativa Linn. were studied for the mode of inheritance of pigmentation of their organs. The studies show that purple leaf blade is conditioned at two loci in such a way that the inhibitor locus must be homozygous recessive for the purple leaf blade gene. Pl to express (ii Pl.). The collar colour is also controlled by the Pl gene. The coloured state of the apiculus, awn, stigma and outer leaf sheath are conditioned by a single dominant gene. The situation is however different for the auricle and ligule which are conditioned by recessive genes at their respective loci. The inner leaf sheath colouration is under the control of two independent genes in complementary action. The Pl gene exhibited manifold pleiotropic effect on all the organs except the inner leaf sheath whose colour it inhibits. The colour of the sterile lemma is due exclusively to the pleiotropic action of the Pl gene. The gene for apiculus colour (Pa) is a major gene which acts as a basic gene for colour expression in the inner leaf sheath acting in complementary mode with gene (Psh) and the organs of the juncture complex – ligule and auricle – which can express colour only when the genes that condition colour in them are present in addition to the gene Pa for purple apiculus colour. Gene Pa, in the homozygous recessive condition is therefore said to be epistatic to the colour genes for the auricle and ligule. Gene Pa also expresses manifold pleiotropic effect on the stigma, awn, nodal ring and outer leaf sheath. This is precisely why this gene is considered the most reliable marker gene of the entire genic system considered. The contribution of pleiotropic action of the various genes was estimated to be between 100% and 22%.
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    Karyotype Studies in Panicum Maximum Jacq
    (2003) Adedeji, O.; Faluyi, J. O.
    Thirty-five accessions of Panicum maximum Jacq were collected from parts of the states of South-western Nigeria to determine the karyotype. The chromosome number is 2n = 32. They are largely sub-metacentric medium small, only chromosome pair one is submetacentric medium large. All accessions studied have symmetrical karyotype. The katyotypic pattern shows that the chromosomes can be grouped into eight groups of four and some size differentials are also recognized within each of the groups. Mitotic metaphase chromosome characters were used to assign the karyotypic formula 1Csm + 15Bsm for P. maximum.
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    Meiotic Chromosome Dynamics in Some Populations of Panicum Maximum Jacq. in Southwestern Nigeria
    (Today & Tomorrow's, 2002) Adedeji, O.; Faluyi, J. O.
    Thirty-five accessions of Panicum maximum Jacq. were collected from parts of the states of southwestern Nigeria to study the meiotic dynamics of the populations. The accessions group into two field forms: the heavy tillering, robust, tall, long and broad-leafed with relatively fat culm and the low-tillering, not so robust, moderately tall, not so long .and narrow-leafed with thin culms. All accessions studied have chromosome number 2n = 32, including the accessions from the Oil Palm Plantation at Apoje, Ijebu-Igbo in Ogun State, for which a chromosome number of 2n = 28 had previously been reported. How this chromosome number could have been arrived at is discussed. Meiotic irregularities of quadrivalents and univalents occurred with high frequency. A mean of about 13 bivalents per cell with regular occurrence of 1 5 quadrivalents per cell suggest that P. maximum is a segmental allopolyploid.