COMPARATIVE STUDIES OF FOLIAR EPIDERMAL FEATURES OF SOME MEMBERS OF THE GENUS IPOMOEA L. IN NORTHERN GUINEA SAVANNAH AND SUDAN SAVANNAH ZONES OF NIGERIA

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dc.contributor.authorTALLE, SHEHU
dc.date.accessioned2020-02-28T09:07:57Z
dc.date.available2020-02-28T09:07:57Z
dc.date.issued2019-04
dc.descriptionA THESIS SUBMITTED TO THE SCHOOL OF POSTGRADUATE STUDIES, AHMADU BELLO UNIVERSITY, ZARIA IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE AWARD OF MASTER DEGREE IN BOTANY DEPARTMENT OF BOTANY, FACULTY OF LIFE SCIENCES, AHMADU BELLO UNIVERSITY, ZARIA, NIGERIAen_US
dc.description.abstractThe genus Ipomoeacomprises the largest number of species within the family Convolvulaceaewhich are widely cultivated as ornamental because of their showy and beautiful flowers. The genus has a wide range of morphological diversity, comprising of annuals, perennial herbaceous plants, vines, shrubs and small trees. Widerange of morphological similarities exists between different taxa of this group which causes ambiguity in the identification of some members of the group. However, in an attempt to establish a stable taxonomic delimitation of different members of the genus, leaf anatomical studies were carried out to establish their relationships. Specimens were treated with bleaching agent (Sodium Hypochlorite 3.2% w/v) for 72 hours to clear the chlorophyll contents, a section of the resulting transparent tissue was then transferred to clean glass slide for microscopic examination. All microscopic measurements were made using a calibrated eyepiece graticules. Microphotographs were taking using Canon Zoom 5x camera.Results revealed the presence of three types of stomata;paracytic, anisocytic and anomocytic stomata were recorded on the abaxial and adaxial surfaces of all the examined species except in I. purpurea where it was not found on the adaxial surfaces of the leaves. Two types of epidermal cells were observed these are sinuous and polygonal, Trichomes were present on the abaxial and adaxial surfaces of Ipomoea nil of the two regions and I. alba of Sudan Savannah region, the margins of epidermal cells of I. repens, I. alba and adaxial surface of I. nilwere wavy, the rest showed a straight wall margin. The two ecological locations have considerable effect on the leaves of this group. High significant different was observed on leaf length of I. batatas, I. alba and I. nil(p˂0.001).I. nil showed and mean length performance of 6.69±0.48μm in Northern Guinea Savannah and 6.66±0.34μm in Sudan Savannah region. The mean length of trichomes found on the abaxial surface of I. nilwas 683.17μm and 390.50μm in Northern Guinea and Sudan regions respectively. Trichomes were absent on both the surfaces of I. alba of Northern Guinea Savannah, but recorded in Sudan Savannah region. The relatedness of Ipomoeaspecies in this study showed that two clades exist; each clade is derived from common ancestral complex. The species that belong to the second clade includes I. nil, I. repens and I. alba. I. purpurea exhibit plesiomorphic character, these may explain their rather isolated position from the first and second cluster in the phenogram of these phenetic relationships. These relationships showed that I. aquatica and I. carneaare sister species. I. carnea and I. repens have common ancestor in addition to the common ancestral root that link all members of the first cluster.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/12254
dc.language.isoenen_US
dc.subjectCOMPARATIVE STUDIES,en_US
dc.subjectFOLIAR EPIDERMAL FEATURES,en_US
dc.subjectMEMBERS OF THE GENUS IPOMOEA L.,en_US
dc.subjectNORTHERN GUINEA SAVANNAH,en_US
dc.subjectSUDAN SAVANNAH ZONES,en_US
dc.subjectNIGERIAen_US
dc.titleCOMPARATIVE STUDIES OF FOLIAR EPIDERMAL FEATURES OF SOME MEMBERS OF THE GENUS IPOMOEA L. IN NORTHERN GUINEA SAVANNAH AND SUDAN SAVANNAH ZONES OF NIGERIAen_US
dc.typeThesisen_US
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