University of Khartoum

Taxonomic Identification of Seven Ipomoea L. Species (Convolvulaceae) in Sudan

Taxonomic Identification of Seven Ipomoea L. Species (Convolvulaceae) in Sudan

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Title: Taxonomic Identification of Seven Ipomoea L. Species (Convolvulaceae) in Sudan
Author: Elshiekh, Mohammed Ahmed Majbour
Abstract: The aim of the present taxonomic study was to determine the affinities and variations between seven species belonging to the genus Ipomoea. The study was based on morphological, anatomical and chemical characters of Ipomoea cairica (L.) Sweet, I. aquatica Forssk, I. pes-caprae (L.) R. Br., I. verticillata Forssk., I. eriocarpa R. Br., I. triloba L., and I. carnea Jacq. The anatomy and morphology of the leaves and stems of the seven species of Ipomoea were described. The morphological characters include quantitative measurements of different parts of the leaves, flowers, length and width of leaf, length of petiole, stigma, style, anther, calyx, and corolla. A key based on important taxonomic characterssuch as plant habit, shapes of leaves and stems, colour of flowers, and seeds was provided to identify each of the seven species of Ipomoea. Emphasis was laid on the anatomically important taxonomic characters such as types of trichomes, types of stomata, secretory cells and activity of the cambium. A key based on these microscopic characters was providedto identify each of the seven of Ipomoea. Morphologically, I. carnea is closely related to I. cairica when their floral parts are considered whereas I. verticillata resembles I. triloba when both floral and foliar parts are compared. The affinities between these pairs of species were confirmed by comparing their polygonal diagrammes of the studied characters. Qualitative analysis of some secondary metabolites extracted from leaves were examined for alkaloids, flavonoids, saponins, glycosides, and steroids. Phenolic compounds were separated by thin layer chromatography. The study showed thatchemical data, in particular common phenolic compounds are useful taxonomic characters. I. eriocarpa and I. triloba are closely related showing 81.8% pair affinity. I.Pes-capraeandI.eriocarpaclosely resemble each other showing 62.2% pair affinity. Similarly, I.trilobaandI.pes-caprae closely resemble each other showing 62.2% pair affinity. I.carneaandI.eriocarpa resemble each other to a lesser degree with 53.3% pair affinity. The results of gas chromatography of essential oils did not confirm the affinities between the previously mentioned pairs but showed close resemblance between I. triloba and I. cairica and between I. eriocarpa and I. aquatic.
URI: http://khartoumspace.uofk.edu/handle/123456789/18837
Date: 2016-02-09


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