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Communication

Contrasting Dihydronaphthoquinone Patterns in Closely Related Drosera (Sundew) Species Enable Taxonomic Distinction and Identification

1
The Center for Plant Molecular Biology (ZMBP), University of Tuebingen, Auf der Morgenstelle 32, D-72076 Tuebingen, Germany
2
Independent Researcher, Wittlinger Str. 5, D-79576 Weil am Rhein, Germany
3
VTT Technical Research Centre of Finland Ltd., Tietotie 2, FIN-02044 Espoo, Finland
*
Authors to whom correspondence should be addressed.
Academic Editors: Daniela Rigano and Ki-Hyun Kim
Plants 2021, 10(8), 1601; https://doi.org/10.3390/plants10081601
Received: 10 July 2021 / Revised: 30 July 2021 / Accepted: 2 August 2021 / Published: 4 August 2021
(This article belongs to the Section Phytochemistry)
Dihydronaphthoquinones are described as constituents of sundews (Drosera), Venus flytraps (Dionaea), and dewy pines (Drosophyllum) for the first time. As in the corresponding naphthoquinones, these reduced derivatives may occur in two regio-isomeric series distinguished by the relative position of a methyl group (at position 2 or 7 in the naphthalene skeleton), depending on the taxon. Species producing plumbagin (2-methyljuglone, 1) do commonly contain the corresponding dihydroplumbagin (5), while species containing ramentaceone (7-methyljuglone, 2) also contain dihydroramentaceone (7-methyl-β-dihydrojuglone, 6). So far, only few species containing plumbagin (1) and dihydroplumbagin (5) additionally form dihydroramentaceone (6) but not ramentaceone (2). Thus, subtle but constant differences in the chemism of closely related and morphologically similar species reliably define and distinguish taxa within D. sect. Arachnopus, which is taken to exemplify their chemotaxonomic utility. The joint presence of quinones and hydroquinones allows observations and predictions on the chemical structures and the reactions of these intriguing natural products. View Full-Text
Keywords: Drosera; droseraceae; naphthoquinones; chemotaxonomy Drosera; droseraceae; naphthoquinones; chemotaxonomy
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MDPI and ACS Style

Schlauer, J.; Hartmeyer, S.R.H.; Hartmeyer, I.; Seppänen-Laakso, T.; Rischer, H. Contrasting Dihydronaphthoquinone Patterns in Closely Related Drosera (Sundew) Species Enable Taxonomic Distinction and Identification. Plants 2021, 10, 1601. https://doi.org/10.3390/plants10081601

AMA Style

Schlauer J, Hartmeyer SRH, Hartmeyer I, Seppänen-Laakso T, Rischer H. Contrasting Dihydronaphthoquinone Patterns in Closely Related Drosera (Sundew) Species Enable Taxonomic Distinction and Identification. Plants. 2021; 10(8):1601. https://doi.org/10.3390/plants10081601

Chicago/Turabian Style

Schlauer, Jan, Siegfried R.H. Hartmeyer, Irmgard Hartmeyer, Tuulikki Seppänen-Laakso, and Heiko Rischer. 2021. "Contrasting Dihydronaphthoquinone Patterns in Closely Related Drosera (Sundew) Species Enable Taxonomic Distinction and Identification" Plants 10, no. 8: 1601. https://doi.org/10.3390/plants10081601

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