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Articles by F.N. Mbagwu
Total Records ( 7 ) for F.N. Mbagwu
  F.N. Mbagwu , C.I.N. Unamba and I.O. Ezeibekwe
  Leaf anatomical characteristics of five variants (A-E) of the genus Viscum (Loranthaceae) were investigated in this study to ascertain the usefulness of these characters and determine the intervariant relationships among the investigated variants. The anatomical features of the leaves showed that these variants possess useful biosystematic characters that can be used to establish intervariant relationships among investigated variants. An interesting aspect of this study is the presence of calcium oxalate crystals inside the chloroplast of variant A, C and D, which differ from the usual localization of crystals in the mesophile of leaves. Also, the presence of uniseriate epidermal cells observed in variants B and C which differ from the multiseriate epidermal cells in A, D and E coupled with the sunken stomata that characterized both variants are discussed in relation to their biosystematic significance.
  F.N. Mbagwu and H.O. Edeoga
  Histochemical studies on eight species of Vigna namely V. ambacensis, V. gracillis, V. racemosa, V. reticulata, V. subterranea, V. triloba, V. unguiculata and V. vexillata was investigated. Analysis of this study showed that there are presence of crystal sand in the leaves of V. ambacensis, V. racemosa, V. subterranea and V. vexillata. In the nodes, V. gracillis and V. racemosa possess aggregate crystals and crystal sand, V. ambacensis, V. unguiculata and V. vexillata possess crystal sand while V. reticulata and V. triloba possess aggregate crystals, respectively. In the petiole anatomy, there are crystal sand in V. ambacensis, V. triloba and V. unguculata, aggregate crystals in V. gracillis and rectangular and crystal sand in V. racemosa. There are rectangular crystals and crystal sand in the stems of V. reticulata and V. subterranea, crystal sand in V. ambacensis and V. vexillata while only the root of V. subterranea possess crystal sand. The diversity in shape of calcium oxalate crystals among the investigated species of Vigna is discussed in relation to their taxonomic significance.
  I.O. Ezeibekwe , C.L. Ezenwaka , F.N. Mbagwu and C.I.N. Unamba
  Studies were carried out with the aim of evaluating in vitro the effects of growth regulators-auxin (NAA) and cytokinin (BAP) combined at different levels on Dioscorea rotundata regeneration potentials on modified Murashige and Skoog media. Concentrations of 0, 0.25, 0.5, 0.75, 1.00 mg L-1 and 0, 0.1, 0.2, 0.3 and 0.4 mg L-1 of NAA and BAP, respectively were used to subculture healthy white yam plantlets. The plant height, number of leaves, nodes, vines, roots and fresh weights were evaluated. Results obtained when analyzed at 5% level of significance showed that the concentration of both hormones (auxin and cytokinin) had significant effects on plant regeneration. BAP (0.2 mg L-1) in combination with NAA (0.5 mg L-1) showed more increase in almost all the parameters measured when compared to other concentrations combined.
  F.N. Mbagwu , E.G. Chime and C.I.N. Unamba
  Palynological studies on five species of the family Asteraceae namely Guternbergia nigritiana, Emilia praetemissa, Vernonia guineensis, Lagera pterodonta and Chromolena odorata was carried out. Results obtained from this investigation showed that the pollen shape is spheroidal in G. nigritiana, E. praetermissa and C. odorata while it is elliptic in V. guineensis and L. pterodonta. The pollen aperture is porate in all except in L. pterodonta where it is elliptic. The pollen wall is echinate in all except in C. odorata where it is smooth. The general appearance of the pollen grains is circular in G. nigritiana, E. praetermissa and C. odorata but longer than wide in V. guinensis and L. pterodonta. It is therefore likely that the nature of the pollen grains in these species could be an evolutionary modification often inherited to determine the mode of pollination and thereby perpetuate a particular group of plants. The similarities in structure showed interspecies relationships and reasons for them to be in the same family while the differences in structures showed reasons for them to exist as distinct species.
  F.N. Mbagwu and H.O. Edeoga
  Observations on the vegetative and floral morphology of eight species of Vigna namely V. ambacensis, V. gracillis, V. racemosa, V. reticulata, V. subterranea, V. triloba, V. unguiculata and V. vexillata are presented. The results of the vegetative characters showed that V. ambacensis and V. gracillis are creeping herbs while others are climbing herbs. The leaf texture of all the taxa are rough except in V. racemosa with smooth leaf texture and the leaf shape of V. reticulata and V. vexillata are lanceolate, linear in V. racemosa but ovate in others. V. reticulata has the longest leaf while V. unguiculata has the widest leaf. The floral symmetry is zygomorphic in V. ambacensis and V. triloba but actinomorphic in others. V. vexillata has the longest pod while V. subterranea has the widest pod. The seed number per pod is numerous in V. reticulata, V. triloba and V. vexillata but ranges from 4-10 in others. The significance of these characters in the taxonomy of these taxa was discussed in view of the perceived similarities in structural and reproductive biology of these taxa.
  F.N. Mbagwu , C.U. Nwachukwu and O.O. Okoro
  The comparative leaf epidermal studies on Solanum macrocarpon and Solanum nigrum showed that the upper and the lower epidermal cell wall of S. nigrum varied in shape from pentagonal, rectangular to hexagonal while the upper and the lower epidermal cell wall of S. macrocarpon are irregular in shape. Although both taxa are amphistomatic but stomata are more abundant at the lower leaf surfaces than the upper leaf surfaces. Both stomata are anomocytic with stomatal index ranging from 5.70-33.02% in S. nigrum and 10.14-32.35% in S. macrocarpon. These observations are important especially as they help to establish interspecie relationships among the two investigated taxa and hence suggest reasons for the two taxa to be in the same genus.
  F.N. Mbagwu , C.U. Nwachukwu and O.O. Okoro
  The anatomical characteristics of the roots of Solanum macrocarpum and Solanum nigrum were investigated to acertain the relevance of these characters in establishment of interspecific similarities and differences in these two taxa. The results showed that there is concentration of vascular bundles at the central portion of the root cortex hence the endodermis is not well differentiated in both taxa. Again the epidermal cells are big and well differentiated in S. macrocarpum but small and well differentiated in S. nigrum. The epidermal cells range from pentagonal to hexagonal in S. macrocarpum but irregularly shaped in S. nigrum. The cells outside the cortex are thick and big in S. macrocarpum but thin, small and elongated in S. nigrum. Although, the size and number of vascular bundles are small and few in both taxa, the presence of one or two oxalate crystals that characterized S. macrocarpum but absent in S. nigrum is an interesting aspect of the root anatomy. The similarities in structures showed reasons for the two taxa to be in the same genus while the differences in root anatomical structures showed reasons for them to be as different species.
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