Naidoo Clarissa, Naidoo Yougasphree, Dewir Yaser Hassan
School of Life Sciences, University of KwaZulu-Natal, Westville Campus, Private Bag X54001, Durban 4000, South Africa.
Plant Production Department, P.O. Box 2460, College of Food & Agriculture Sciences, King Saud University, Riyadh 11451, Saudi Arabia.
Plants (Basel). 2020 May 28;9(6):686. doi: 10.3390/plants9060686.
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 (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 . In addition, this investigation similarly established the probable functions of latex and laticifers.
由于夹竹桃科内乳汁管的解释存在不一致性，当前研究旨在首次区分森林蟾蜍树的胚胎、幼苗和成年植株中乳汁管的类型和分布。使用光学显微镜和电子显微镜确定乳汁管的特征和分布。研究结果显示存在有节的吻合乳汁管。发现乳汁管起源于基本分生组织和原形成层细胞，并随机分布于所有基本组织和维管组织中，呈现出复杂的分支形态。通过组织化学分析确定乳汁管和乳汁中化学成分的存在，揭示了生物碱、酚类、中性脂质、萜类、黏液、果胶、树脂酸、羧化多糖、亲脂性和亲水性物质以及蛋白质的存在。这些次生代谢产物在防止食草、阻碍和威慑微生物方面发挥着不可或缺的作用，并且可能具有药用价值。本研究结果概述了森林蟾蜍树乳汁管的首次微观形态学、解剖学、超微结构和化学分析。此外，该研究同样确定了乳汁和乳汁管的可能功能。
