Abstract Detail


Akinyemi, Oluwaseun [1].

Morphological Characterization on some species of Ocimum L. (Lamiaceae) in Southwest of Nigeria.

Abstract The genus Ocimum (Lamiaceae) is composed of aromatic plants. There are reports of difficulty in the taxonomy of the genus despite its numerous economic and medicinal importance. Parallel to this is the presence of other plants with peculiar strong smell exudation but not of the Ocimum group. Due to large morphological variations among the different species, their clear-cut identities are required to the genus level. Seeds of one hundred and twenty accessions belonging to three species of Ocimum namely and grouped as Ocimum basilicum L. (B-series), O. canum L. (C-series) and O. gratissimum L. (G-series) were collected from six states in Southwest Nigeria. The seeds were planted in 10-Litre plastic pots filled with topsoil in three replicates on a single row. Based on ease of germination, forty-five accessions spread across the study area were purposively selected. Morphological and Reproductive studies were conducted and data were collected on thirty-four qualitative and twenty-three quantitative characters encompassing vegetative, floral features and fruit (nutlets) characters. Statistical analyses of quantitative data were performed using SAS/PC1 version 9.01. Results gave an early distinctive separation of the B-series accessions with a straight confirmation of their non-inclusion among the Ocimum group but rather belonging to another genus-Hyptis-in the Family. Five distinct morphological-types of Ocimum based on leaf-shapes, leaf colour, leaf apices, leaf pubescence, inflorescence arrangement and flower colours are discovered. This study reveals the existence of morphological variations among the accessions of C-series which can be further enumerated through molecular characterization. These characteristics may be exploited by Plant Breeders and Taxonomists for sustainable utilization of the Ocimum germplasm. 

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Presentation Type: Oral Paper
Session: SYS1, Systematics I: Asterids I & II
Location: Virtual/Virtual
Date: Monday, July 27th, 2020
Time: 10:30 AM
Number: SYS1003
Abstract ID:62
Candidate for Awards:None

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