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Open AccessArticle

The Secretory Apparatus of Tabernaemontana ventricosa Hochst. ex A.DC. (Apocynaceae): Laticifer Identification, Characterization and Distribution

1
School of Life Sciences, University of KwaZulu–Natal, Westville Campus, Private Bag X54001, Durban 4000, South Africa
2
Plant Production Department, P.O. Box 2460, College of Food & Agriculture Sciences, King Saud University, Riyadh 11451, Saudi Arabia
3
Department of Horticulture, Faculty of Agriculture, Kafrelsheikh University, Kafr El-Sheikh 33516, Egypt
*
Author to whom correspondence should be addressed.
Plants 2020, 9(6), 686; https://doi.org/10.3390/plants9060686
Received: 28 April 2020 / Revised: 17 May 2020 / Accepted: 25 May 2020 / Published: 28 May 2020
(This article belongs to the Special Issue Plant Secretory Structures)
Due to the inconsistencies in the interpretation of laticifers within the Apocynaceae, the current study aimed to distinguish, for the first time, the type and distribution of the laticifers in the embryos, seedlings and adult plants of Tabernaemontana ventricosa (Forest Toad tree). The characterization and distribution of laticifers were determined using light and electron microscopy. The findings revealed the presence of articulated anastomosing laticifers. The laticifers were found to have originated from ground meristematic and procambium cells and were randomly distributed in all ground and vascular tissue, displaying complex branching conformations. The presence of chemical constituents within the laticifers and latex determined by histochemical analysis revealed the presence of alkaloids, phenolics, neutral lipids, terpenoids, mucilage, pectin, resin acids, carboxylated polysaccharides, lipophilic, and hydrophilic substances and proteins. These secondary metabolites perform an indispensable role in preventing herbivory, hindering and deterring micro-organisms and may possibly have medicinal importance. The outcomes of the present study outlined the first micromorphology, anatomy, ultrastructural and chemical analysis of the laticifers of T. ventricosa. In addition, this investigation similarly established the probable functions of latex and laticifers. View Full-Text
Keywords: laticifers; latex; articulated; anastomosing; alkaloids laticifers; latex; articulated; anastomosing; alkaloids
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MDPI and ACS Style

Naidoo, C.; Naidoo, Y.; Dewir, Y.H. The Secretory Apparatus of Tabernaemontana ventricosa Hochst. ex A.DC. (Apocynaceae): Laticifer Identification, Characterization and Distribution. Plants 2020, 9, 686.

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