Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Bacterial influencers -- rhizosphere microbiome mediates root metabolite exudation

10.02.2020

Roots are plant organs, that typically absorb water and minerals from soil. It is lesser known that roots also secrete metabolites, so-called root exudates, which impact the properties of soil directly around the root. This thin layer of soil is called the rhizosphere and is home to a rich microbial diversity, the root microbiota.

By producing certain exudates, plants communicate with and govern the microbial life within their rhizosphere for their own benefit. Now, researchers have discovered that this is not a one-way process.


Bacterial communities trigger systemic signals that lead to regulatory and metabolic changes in distant roots, as well as in green parts of the plant. One function of such signaling is root system-wide management of the rhizosphere microbiota via exudation of specific molecules to the soil.

Credit: J. Szymanski / IPK

Whilst investigating tomato plants, they found that the microbiota can also systemically shape and control root exudation.

When thinking of ecological hotspots, roots and the earth surrounding them might not immediately spring to mind. However, precisely this region, the rhizosphere, is considered as one of the most complex ecosystems found on earth.

It harbours a divers microbiotic community, including numerous bacteria, fungi and archaea, thriving in an environment rich in biochemical compounds, that are exuded by plant roots at the core of the rhizosphere.

Plants govern the rhizosphere microbiota and shape the soil physical and chemical properties through their root exudates. At the same time, it is well known that roots sense changes in the rhizosphere and trigger systemic responses to defend against pathogens or to adjust to changes in nutrient availability.

Nonetheless, there are still many open questions regarding the dynamics and impact of the microbiota on the root itself, and it was not clear how, or whether at all, the rhizosphere microbiota affects the root exudation. An international research team led by Dr. Elisa Korenblum, a scientist from the Weizmann Institute of Science in Israel in collaboration with Dr. Jedrzej Szymanski from the Leibniz Institute IPK in Gatersleben, recently took on this question whilst investigating roots of tomato plants.

Dr Korenblum and her team conducted and analysed a row of split-root experiments, where half of roots of each plant was exposed to a microbiome-rich soil, and the other half was grown in sterile and biochemically ambient conditions.

This enabled them to investigate the effect of different microbial communities on the local root system, as well as the systemic changes in the distant roots in anticipation of the presence of new microorganisms.

Dr. Szymanski, head of the Network Analysis and Modelling group, traced the complex network of biochemical and gene expression signals controlling this microbiome-root communication and their propagation from the place of origin to distant roots.

They thereby discovered that the tomato rhizosphere microbiome can directly affect the chemical composition of roots and root exudates via a systemic root-to-root signalling mechanism. For example, bacteria of the genus Bacillus use this process, which the scientists termed Systemically Induced Root Exudation of Metabolites (SIREM), to trigger the secretion of acylsugars in the whole root system.

The discovery of SIREM is a first step towards untangling the regulatory network spanning the complex plant root-microbial relationship. It is likely that the SIREM process is a key feature of root-microbiota interactions within the rhizosphere, and that the microbiome-reprogrammed systemic root exudation promotes soil conditioning. The precise extent of the regulatory role and incidence of SIREM is yet to be determined.

Media Contact

Dr. Jedrzej Szymanski
szymanski@ipk-gatersleben.de
49-394-825-753

 @IPKGatersleben

https://www.ipk-gatersleben.de/ 

Dr. Jedrzej Szymanski | EurekAlert!
Further information:
http://dx.doi.org/10.1073/pnas.1912130117

Further reports about: Plant Genetics bacteria metabolite microbial microbiota rhizosphere root root system tomato plants

More articles from Life Sciences:

nachricht Colorectal cancer: Increased life expectancy thanks to individualised therapies
20.02.2020 | Christian-Albrechts-Universität zu Kiel

nachricht Sweet beaks: What Galapagos finches and marine bacteria have in common
20.02.2020 | Max-Planck-Institut für Marine Mikrobiologie

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: A step towards controlling spin-dependent petahertz electronics by material defects

The operational speed of semiconductors in various electronic and optoelectronic devices is limited to several gigahertz (a billion oscillations per second). This constrains the upper limit of the operational speed of computing. Now researchers from the Max Planck Institute for the Structure and Dynamics of Matter in Hamburg, Germany, and the Indian Institute of Technology in Bombay have explained how these processes can be sped up through the use of light waves and defected solid materials.

Light waves perform several hundred trillion oscillations per second. Hence, it is natural to envision employing light oscillations to drive the electronic...

Im Focus: Freiburg researcher investigate the origins of surface texture

Most natural and artificial surfaces are rough: metals and even glasses that appear smooth to the naked eye can look like jagged mountain ranges under the microscope. There is currently no uniform theory about the origin of this roughness despite it being observed on all scales, from the atomic to the tectonic. Scientists suspect that the rough surface is formed by irreversible plastic deformation that occurs in many processes of mechanical machining of components such as milling.

Prof. Dr. Lars Pastewka from the Simulation group at the Department of Microsystems Engineering at the University of Freiburg and his team have simulated such...

Im Focus: Skyrmions like it hot: Spin structures are controllable even at high temperatures

Investigation of the temperature dependence of the skyrmion Hall effect reveals further insights into possible new data storage devices

The joint research project of Johannes Gutenberg University Mainz (JGU) and the Massachusetts Institute of Technology (MIT) that had previously demonstrated...

Im Focus: Making the internet more energy efficient through systemic optimization

Researchers at Chalmers University of Technology, Sweden, recently completed a 5-year research project looking at how to make fibre optic communications systems more energy efficient. Among their proposals are smart, error-correcting data chip circuits, which they refined to be 10 times less energy consumptive. The project has yielded several scientific articles, in publications including Nature Communications.

Streaming films and music, scrolling through social media, and using cloud-based storage services are everyday activities now.

Im Focus: New synthesis methods enhance 3D chemical space for drug discovery

After helping develop a new approach for organic synthesis -- carbon-hydrogen functionalization -- scientists at Emory University are now showing how this approach may apply to drug discovery. Nature Catalysis published their most recent work -- a streamlined process for making a three-dimensional scaffold of keen interest to the pharmaceutical industry.

"Our tools open up whole new chemical space for potential drug targets," says Huw Davies, Emory professor of organic chemistry and senior author of the paper.

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

70th Lindau Nobel Laureate Meeting: Around 70 Laureates set to meet with young scientists from approx. 100 countries

12.02.2020 | Event News

11th Advanced Battery Power Conference, March 24-25, 2020 in Münster/Germany

16.01.2020 | Event News

Laser Colloquium Hydrogen LKH2: fast and reliable fuel cell manufacturing

15.01.2020 | Event News

 
Latest News

Active droplets

21.02.2020 | Medical Engineering

Finding new clues to brain cancer treatment

21.02.2020 | Health and Medicine

Beyond the brim, Sombrero Galaxy's halo suggests turbulent past

21.02.2020 | Physics and Astronomy

VideoLinks
Science & Research
Overview of more VideoLinks >>>