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IPB Newsletter | April 2025
Understanding Plants!

The IPB Video
Molecular Signal Processing

Prof. Dr. Steffen Abel
How plants stand their ground.
Bioorganic Chemistry

Prof. Dr. Ludger Wessjohann
The chemistry of nature - basis for active compounds for human and plant health.
Biochemistry of Plant Interactions

Prof. Dr. Tina Romeis
Interactions in, of and with plants.
Cell and Metabolic Biology

Prof. Dr. Alain Tissier
Secondary but never unimportant - the biological functions of plant secondary metabolites.
Independent Junior Research Group

Dr. Mariana Schuster

New findings on OPDA: No signaling effect in the early wound response

The plant stress hormone jasmonic acid (JA) and its bioactive form jasmonoyl isoleucine (JA-Ile) play a central role in the…

The IPB has once again been recognized for its exemplary actions in terms of equal opportunity-oriented personnel and organizational policies and has received the TOTAL E-QUALITY certification for the…

The Plant Science Student Conference (PSSC) has been organised by students from the two Leibniz institutes, IPK and IPB, every year for the last 20 years. In this interview, Christina Wäsch (IPK) and…

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Synthetic Organic Chemist (m/f/d) (18/2025)

Date: 2025-08-19 Reference Number: 18/2025

PhD position in biology (m/f/d) (17/2025)

Date: 2025-08-08 Reference Number: 17/2025

PhD in Machine Learning for Enzyme Design (m/f/d)

Date: 2025-05-16 Reference Number: 11/2025

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Hartwig, R. P.; Santangeli, M.; Würsig, H.; Martín Roldán, M.; Yim, B.; Lippold, E.; Tasca, A.; Oburger, E.; Tarkka, M.; Vetterlein, D.; Bienert, P.; Blagodatskaya, E.; Smalla, K.; Hause, B.; Wimmer, M. A.; Drought response of the maize plant-soil-microbiome system is influenced by plant size and presence of root hairs Ann. Bot. mcaf033 (2025) DOI: 10.1093/aob/mcaf033

Background and Aims We have abundant knowledge on drought responses of plants or soil microorganisms individually. However, there is a severe lack of knowledge regarding interactions in the plant-soil-microbiome continuum, and specifically root-soil interface traits including the role of root hairs. Here, we investigated how water limitation propagates in a plant-soil-microbiome system upon stopping irrigation. We used two Zea mays genotypes (rth3 and its isogenic wildtype B73), differing in root hair formation, to elucidate the effect of rhizosphere extension under water limitation. Methods For 22 days, WT and rth3 were grown in a climate chamber, with irrigation stopped for drought treatment during the last 7 days. Daily measurements included soil water status, plant evapotranspiration and gas exchange. At harvest, root exudates, shoot relative water content, osmolality and nutrients, root morphological traits and transcriptomics, and soil microbial β-diversity and enzyme activity were determined. Key Results In line with a larger plant size, drought stress developed more rapidly and the number of differentially expressed genes was higher in the WT compared to rth3. Under water limitation, root exudation rates increased and soil enzyme activities decreased more strongly in the WT rhizosphere. In both genotypes, water level significantly altered microbial β-diversity in the bulk soil, particularly affecting fungi more than bacteria/archaea. The genotype affected only bacteria/archaea and was more pronounced in rhizosphere than in bulk soil.Conclusions This interdisciplinary study assessed how a short drought stress manifested in a plant-soil-microbiome system. Water limitation altered microbial (fungal) diversity more distant from the root surface. Genotype-specific stress-induced increases in exudation rates modified microbial activity in root proximity, possibly pointing to root hair functions under water limitation. Less intense drought responses of rth3 were confirmed at all levels of investigation and may be due at least in part to its smaller plant size.

IPB Newsletter | April 2025

Understanding Plants!

Molecular Signal Processing

Bioorganic Chemistry

Biochemistry of Plant Interactions

Cell and Metabolic Biology

Independent Junior Research Group

+++ News Ticker Science 183 +++ Phytohormones +++

New findings on OPDA: No signaling effect in the early wound response

IPB receives TOTAL E-QUALITY certification for the sixth time in a row

PSSC: Success for the ‘Iron Lady’

Synthetic Organic Chemist (m/f/d) (18/2025)

PhD position in biology (m/f/d) (17/2025)

PhD in Machine Learning for Enzyme Design (m/f/d)

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