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4. Juli 2025 am IPB
IPB-Newsletter | April 2025
Wir verstehen Pflanzen!

Der Film zum Institut
Molekulare Signalverarbeitung

Prof. Dr. Steffen Abel
Wie Pflanzen ihrer Umwelt trotzen.
Natur- und Wirkstoffchemie

Prof. Dr. Ludger Wessjohann
Die Chemie der Natur – Basis für Wirkstoffe zur Gesunderhaltung von Mensch und Pflanze.
Biochemie pflanzlicher Interaktionen

Prof. Dr. Tina Romeis
Wechselwirkungen in, von und mit Pflanzen.
Stoffwechsel- und Zellbiologie

Prof. Dr. Alain Tissier
Sekundär jedoch nicht zweitrangig - Die biologischen Funktionen pflanzlicher Sekundärmetaboliten.
Unabhängige Nachwuchsgruppe

Dr. Mariana Schuster

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Omanische Heilpflanze im Fokus der Phytochemie
IPB-Wissenschaftler und Partner aus Dhofar haben jüngst die omanische Heilpflanze Terminalia dhofarica unter die phytochemische Lupe genommen. Die Pflanze ist reich an…

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FlavorMiner heißt das Tool, das IPB-Chemiker und Partner aus Kolumbien jüngst entwickelt haben. Das Programm kann, basierend auf maschinellem Lernen (KI), anhand der…

Im Rahmen der Wirkstofftage am 9. April 2025 verlieh das Leibniz-Forschungsnetzwerk Wirkstoffe den Preis „Leibniz-Wirkstoff des Jahres“ 2025 an Dr. Ibrahim Morgan, Dr. Robert Rennert, Dr. Tuvshinjargal Budragchaa und Prof.…

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Laborantin bzw. Technischer Assistent*in (m/w/d) (9/2025)

Datum: 08.04.2025 Referenznummer: 9/2025

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Paponov, M.; Ziegler, J.; Paponov, I. A.; Light exposure of roots in aeroponics enhances the accumulation of phytochemicals in aboveground parts of the medicinal plants Artemisia annua and Hypericum perforatum Front. Plant Sci. 14 1079656 (2023) DOI: 10.3389/fpls.2023.1079656

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Paponov, M.; Flate, J.; Ziegler, J.; Lillo, C.; Paponov, I. A.; Heterogeneous nutrient supply modulates root exudation and accumulation of medicinally valuable compounds in Artemisia annua and Hypericum perforatum Front. Plant Sci. 14 1174151 (2023) DOI: 10.3389/fpls.2023.1174151

Plants have evolved complex mechanisms to adapt to nutrient-deficient environments, including stimulating lateral root proliferation into local soil patches with high nutrient content in response to heterogeneous nutrient distribution. Despite the widespread occurrence of this phenomenon in soil, the effect of heterogeneous nutrient distribution on the accumulation of secondary compounds in plant biomass and their exudation by roots remains largely unknown. This study aims to fill this critical knowledge gap by investigating how deficiency and unequal distributions of nitrogen (N), phosphorus (P), and iron (Fe) affect plant growth and accumulation of the antimalarial drug artemisinin (AN) in leaves and roots of Artemisia annua, as well as AN exudation by roots. Heterogeneous N and P supplies strongly increased root exudation of AN in half of a split-root system exposed to nutrient deficiency. By contrast, exposure to a homogeneous nitrate and phosphate deficiency did not modulate root exudation of AN. This indicates that a combination of local and systemic signals, reflecting low and high nutritional statuses, respectively, were required to enhance AN exudation. This exudation response was independent of the regulation of root hair formation, which was predominantly modulated by the local signal. In contrast to the heterogeneous supply of N and P, heterogeneous Fe supply did not modulate AN root exudation but increased AN accumulation in locally Fe-deficient roots. No modulation of nutrient supply significantly changed the accumulation of AN in A. annua leaves. The impact of a heterogeneous nitrate supply on growth and phytochemical composition was also investigated in Hypericum perforatum plants. Unlike in A. annue, the uneven N supply did not significantly influence the exudation of secondary compounds in the roots of H. perforatum. However, it did enhance the accumulation of several biologically active compounds, such as hypericin, catechin, and rutin isomers, in the leaves of H. perforatum. We propose that the capacity of plants to induce the accumulation and/or differential exudation of secondary compounds under heterogeneous nutrient supply is both species- and compound-specific. The ability to differentially exude AN may contribute to A. annua’s adaptation to nutrient disturbances and modulate allelopathic and symbiotic interactions in the rhizosphere.

Publikation

Richter, C.; Grafahrend-Belau, E.; Ziegler, J.; Raorane, M. L.; Junker, B. H.; Improved 13C metabolic flux analysis in Escherichia coli metabolism: application of a high-resolution MS (GC–EI–QTOF) for comprehensive assessment of MS/MS fragments Journal of Industrial Microbiology and Biotechnology 50 kuad039 (2023) DOI: 10.1093/jimb/kuad039

Publikation

Blatt-Janmaat, K.; Neumann, S.; Schmidt, F.; Ziegler, J.; Qu, Y.; Peters, K.; Impact of in vitro phytohormone treatments on the metabolome of the leafy liverwort Radula complanata (L.) Dumort Metabolomics 19 17 (2023) DOI: 10.1007/s11306-023-01979-y

Introduction Liverworts are a group of non-vascular plants that possess unique metabolism not found in other plants. Many liverwort metabolites have interesting structural and biochemical characteristics, however the fluctuations of these metabolites in response to stressors is largely unknown. Objectives To investigate the metabolic stress-response of the leafy liverwort Radula complanata. Methods Five phytohormones were applied exogenously to in vitro cultured R. complanata and an untargeted metabolomic analysis was conducted. Compound classification and identification was performed with CANOPUS and SIRIUS while statistical analyses including PCA, ANOVA, and variable selection using BORUTA were conducted to identify metabolic shifts.Results It was found that R. complanata was predominantly composed of carboxylic acids and derivatives, followed by benzene and substituted derivatives, fatty acyls, organooxygen compounds, prenol lipids, and flavonoids. The PCA revealed that samples grouped based on the type of hormone applied, and the variable selection using BORUTA (Random Forest) revealed 71 identified and/or classified features that fluctuated with phytohormone application. The stress-response treatments largely reduced the production of the selected primary metabolites while the growth treatments resulted in increased production of these compounds. 4-(3-Methyl-2-butenyl)-5-phenethylbenzene-1,3-diol was identified as a biomarker for the growth treatments while GDP-hexose was identified as a biomarker for the stress-response treatments. Conclusion Exogenous phytohormone application caused clear metabolic shifts in Radula complanata that deviate from the responses of vascular plants. Further identification of the selected metabolite features can reveal metabolic biomarkers unique to liverworts and provide more insight into liverwort stress responses.

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Lange Nacht, die Wissen schafft

IPB-Newsletter | April 2025

Wir verstehen Pflanzen!

Molekulare Signalverarbeitung

Natur- und Wirkstoffchemie

Biochemie pflanzlicher Interaktionen

Stoffwechsel- und Zellbiologie

Unabhängige Nachwuchsgruppe

Aktuelles

+++ Newsticker Wissenschaft #182 +++ Naturstoffe +++

+++ Newsticker Wissenschaft #181 +++ Maschinelles Lernen +++

Preisverleihung zu den Wirkstofftagen: “Leibniz-Wirkstoff des Jahres 2025” geht an IPB-Team für Krebsforschungsprojekt

Stellenausschreibungen

Laborantin bzw. Technischer Assistent*in (m/w/d) (9/2025)

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