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Articles by C.I.N. Unamba
Total Records ( 3 ) for C.I.N. Unamba
  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.
  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.
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