Abstract Detail

Anatomy and Morphology

OJO, Funmilola Mabel [1], Nwokeocha, Chinyere Constance  [2].

Morphological and Foliar Epidermal studies of Andropogon gayanus (Kunth) Andropogon tectorum (Schum & Thonns) Complex in Southwestern, Nigeria.

Morphological and foliar epidermal studies were carried out on Andropogon gayanus-Andropogon tectorum complex accessions collected from different locations in Southwestern Nigeria. The results from earlier studies on the species complex revealed some salient problems which have not been adequately and conclusively addressed. Therefore, this study was aimed at providing full characterization of the two Andropogon species so as to elucidate their population dynamics and to determine the patterns of variation in their epidermal characteristics in order to assess their value in species identification and classification. Morphological data from selected accessions were collected and characterized using Biodiversity International (2007). Cleared epidermal peels were obtained through free hand peeling, preserved in 50% ethanol, stained in Safranin O and counter-stained in Alcian blue to enhance contrast. All the preparations were mounted in 25% glycerol. Both adaxial and abaxial surfaces of the leaves were studied. Characters like type of stomata, subsidiary cells, trichomes, prickle hair, papillae were observed and described. In addition, measurements were made for length and breadth of long and short cells, stomata, micro hairs and macro hairs. Photomicrographs of the foliar epidermal peels were taken at X10 and X20 objectives under BK Series. The data obtained were subjected to Simple Descriptive test, Duncan’s multiple range test and Principal Components Analysis.For the morphological studies, results showed that all the tectorum clones in the collections possess glabrous leaves, sheath and petiole except few ones with hairy leaf blades and petioles when young. The keel was observed to be prominent. Andropogon gayanus exhibits a considerable amount of overlap in the expression of traits like hairiness of vegetative parts; notably, the leaf sheath, petiole and lamina. Foliar epidermal studies revealed that straight, large thick cell wall, paracytic stomata, cork cells, numerous and uniformly-sized papillae were common to the two species studied. However, long cells and short cells were significantly longer in length and breadth in A. gayanus. In addition, micro hairs with base surrounded by cells are diagnostic features for A. gayanus.

1 - Department Of Biological Sciences, Ondo State University Of Science And Technology Okitipupa , P.M.B. 353, Km 6, Okitipupa-Igbokoda Road, Okitipupa, Ondo, ON, 234, Nigeria
2 - Obafemi Awolowo University , Department of Botany, Ile-Ife, Osun, 23401, Nigeria

Andropogon gayanus 
Andropogon tectorum 
morphological .

Presentation Type: Oral Paper
Session: AM1, Anatomy and Morphology
Location: Virtual/Virtual
Date: Wednesday, July 29th, 2020
Time: 12:30 PM
Number: AM1010
Abstract ID:29
Candidate for Awards:None

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