Abstract
The polymerase chain reaction coupled with denaturing gradient gel electrophoresis (PCR-DGGE) has been used widely to determine species richness and structure of microbial communities in a variety of environments. Researchers commonly archive soil samples after routine chemical or microbial analyses, and applying PCR-DGGE technology to these historical samples offers evaluation of long-term patterns in bacterial species richness and community structure that was not available with previous technology. However, use of PCR-DGGE to analyze microbial communities of archived soils has been largely unexplored. To evaluate the stability of DGGE patterns in archived soils in comparison with fresh soils, fresh and archived soils from five sites along an elevational gradient in the Chihuahuan Desert were compared using PCR-DGGE of 16S rDNA. DNA from all archived samples was extracted reliably, but DNA in archived soils collected from a closed-canopy oak forest site could not be amplified. DNA extraction yields were lower for most archived soils, but minimal changes in bacterial species richness and structure due to archiving were noted in bacterial community profiles from four sites. Use of archived soils to determine long-term changes in bacterial community structure via PCR-DGGE appears to be a viable option for addressing microbial community dynamics for particular ecosystems or landscapes.
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Acknowledgments
This work was funded by United States Geological Survey-BRD Small Watershed Program and National Park Service grants to JCZ. Access to sites was made possible by Joe Sirotnak (Big Bend National Park). Many helpful discussions were provided by Dora Ogles (Microbial Insights), Edward Sobek (Clean Air Labs), and Jennifer Humphries (Texas Tech University).
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Campbell, J.H., Clark, J.S. & Zak, J.C. PCR-DGGE Comparison of Bacterial Community Structure in Fresh and Archived Soils Sampled along a Chihuahuan Desert Elevational Gradient. Microb Ecol 57, 261–266 (2009). https://doi.org/10.1007/s00248-008-9479-3
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DOI: https://doi.org/10.1007/s00248-008-9479-3