Terpene Derivatives, Essential Oils, Balsams, and Resins

Stahl, Egon; Jork, H.

doi:10.1007/978-3-662-01031-0_11

Cited by 2 publications

(1 citation statement)

References 29 publications

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“…For this test, the sections were previously exposed to the vapor of boiling water to remove volatile oils (Eckerson, 1930) or immersed in copper acetate without pretreatment. 2,4-Dinitrophenyl hydrazine (2,4-DNPH) was used to detect aldehydes and ketones (adapted from Stahl and Jork, 1965); yellow precipitates are formed by 2,4-DNPH reactions with aliphatic and aromatic carbonyl groups and orange-red precipitates containing aromatic groups are formed by 2,4-DNPH reactions with α,β-unsaturated carbonyl groups (Lehman, 1988). The treated samples were compared with untreated samples (blank) and with sections without secretion (negative control, after treatment with ethanol).…”

Section: Histochemistrymentioning

confidence: 99%

Neither lysigenous nor just oil: Demystifying myrtaceous secretory cavities

Richit,

Díaz,

Dick

et al. 2023

American J of Botany

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PremiseLeaf subepidermal secretory cavities are a notable trait in Myrtaceae. The formation of these secretory structures is still controversial because of the lack of consensus on their ontogeny among authors. The knowledge about the nature of the compounds present in these cavities has grown over the last few years, demonstrating that terpenoid‐rich oils are not their unique content. These two points are the focus of this study, which investigates the ontogeny, structure and the contents of secretory cavities in Neotropical Myrtaceae.MethodsWe used histochemical tests and Raman analysis to verify the basic chemical composition of cavity content of nine species and investigated the ontogeny of glands in one species, comparing aldehyde‐fixed tissues and fresh sections mounted in an inert medium.ResultsWe observed schizogenous development and appearance in secretory cavities and found that tissue processing may induce cell breakdown, which can be misinterpreted as lysigeny. The content of these cavities contains prospective terpenes, resins, carbonyl groups, and flavonoids.ConclusionsOur findings support the hypothesis that technical artifacts may produce a lysigenous impression in oil glands. These tissue distortions must be considered when interpreting the development of this type of secretory structure. Moreover, the basic analyses of chemical constituents show for the first time that the glands of Neotropical Myrtaceae are potential reservoirs of some compounds previously reported as novelties for a few other myrtaceous species, such as flavonoids. As some of them are non‐lipid compounds, the idea that glands are just oil repositories is no longer applicable.This article is protected by copyright. All rights reserved.

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Section: Histochemistrymentioning

confidence: 99%