Related Experiment Video
Updated: May 23, 2026
06:29
A Method to Preserve Wetland Roots and Rhizospheres for Elemental Imaging
Published on: February 15, 2021
Freeze-coring method for characterization of microbial community structure and function in wetland soils at high
Alessandro G Franchini1, Josef Zeyer
1Institute of Biogeochemistry and Pollutant Dynamics, ETH Zurich, Zurich, Switzerland.
Applied and Environmental Microbiology
|April 12, 2012
Summary
A new freeze-coring technique effectively preserves wetland soil structure and function. This method allows for the analysis of biological components and recovery of sensitive molecules like mRNA.
Area of Science:
- Environmental Science
- Soil Science
- Geology
Background:
- Wetland soils are crucial ecosystems but challenging to sample without structural damage.
- Preserving the integrity of soil samples is vital for accurate analysis of biological and chemical properties.
- Existing methods often compromise the structure and composition of delicate wetland soil samples.
Purpose of the Study:
- To develop a simple and effective method for obtaining structurally intact cores from wetland soils.
- To enable the analysis of biological structure and function in preserved soil cores.
- To facilitate the recovery of labile compounds, such as mRNA, from soil samples.
Main Methods:
- A novel freeze-coring technique using a copper tube inserted into the wetland.
- Application of ethanol and dry ice within the tube to freeze surrounding soil.
- Extraction of structurally intact soil cores post-freezing.
Main Results:
- The developed method successfully obtained structurally intact wetland soil cores.
- Preserved cores allowed for detailed analysis of soil biological structure and function.
- Labile compounds, including messenger RNA (mRNA), were successfully recovered from the frozen cores.
Conclusions:
- The simple freeze-coring method is a valuable tool for wetland soil research.
- This technique enhances the ability to study soil ecosystems and their components.
- It provides a reliable approach for preserving and analyzing sensitive biomolecules in situ.
Related Concept Videos
01:19Methods to Assess Microbial Communities
Microbial communities, comprising bacteria, archaea, and eukaryotic microorganisms, inhabit diverse ecosystems and play crucial roles in environmental and biological processes. Their diversity is defined by three main parameters: species richness (the number of distinct species), species abundance (the relative quantity of each species), and species evenness (how uniformly individual species are distributed in various locations). These factors together shape the structure and ecological balance...
01:24Freshwater Microbial Ecology
Freshwater systems such as streams, rivers, and lakes exhibit distinct physical and biological characteristics that influence their microbial communities. These environments are broadly categorized into lotic systems—those with flowing waters like streams and most rivers—and lentic systems, which include still or slow-moving waters such as lakes, ponds, and marshes.In lentic systems, phytoplankton drive primary production, generating autochthonous organic carbon. In contrast, lotic systems...
01:29Soil Microbial Ecology
Soil microbial ecology is defined by highly diverse, spatially structured communities that drive nutrient cycling, organic matter turnover, and overall ecosystem stability. Although a gram of soil can contain thousands of bacterial and archaeal taxa, the ecological processes they mediate are even more crucial for sustaining terrestrial life.Microhabitats and NichesSoil is a heterogeneous mixture of minerals, organic matter, water, and air. Microbes inhabit distinct microhabitats formed by...
01:25Microbial Mats
Microbial communities forming biofilms and mats represent complex, spatially structured ecosystems where metabolic processes are stratified according to light, oxygen, and nutrient gradients. Biofilms are initial colonization stages, only a few millimeters thick, while mature microbial mats can reach centimeter-scale thickness and display intricate vertical organization. Their structural and functional heterogeneity allows microorganisms to occupy distinct ecological niches within a few...
01:30Methods to Assess Microbial Populations
Assessing microbial populations is crucial for understanding microbial roles in health, ecology, and industry. Various complementary techniques—both culture-based and molecular—enable detailed analysis of microbial abundance, diversity, and function.Viable Plate CountThe viable plate count is a traditional culture-based method used to estimate the number of living microbes in a sample. After serial dilution, the sample is spread onto nutrient agar plates. Each viable cell forms a visible...