Abstract
This study aimed to investigate the utilization of a buffer solution, containing Tris, HCl, EDTA, NaCl, and glycerol (THENG), in combination with a thermal shock process, as a novel DNA extraction method (THENG-tsp) for endophytic fungi. Three mg of fungal mycelium was added to 100 μL of THENG buffer and incubated in a water-bath (83 ± 2 °C) for 35 min. The vials were subsequently frozen at -20 °C for 15 min and then subjected to centrifugation (11,200 m/s2; 6 min). The resulting supernatant was used as a pure DNA source. In addition, the DNA of endophytic fungi was extracted using the cetyl trimethylammonium bromide (CTAB) method. DNA quality was evaluated based on light intensity and distance (in pixels) of bands observed on a 0.8% agarose gel after electrophoresis. The results indicate that the application of the THENG-tsp method improved the average band quality of all endophytic fungi by 7.86%. More precisely, bands corresponding to endophytic fungi belonging to the Basidiomycota and Ascomycota phyla exhibited an average increase in band quality of 13.50% and 8.57%, respectively, compared to the CTAB method. The application of the THENG-tsp method also resulted in improved band quality for Alternaria spp. and Fusarium spp., with average increases of 8.47% and 28.40%, respectively, compared to the CTAB method. Hence, the THENG-tsp method is considered appropriate for DNA extraction from endophytic fungi in laboratory settings due to its minimal requirement of initial fungal mycelium, time efficiency, and the absence of the use of potentially harmful chemical compounds.
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Data availability
Raw data of the current study are available from the corresponding author on reasonable request. The ITS genome sequence of the endophytic fungi used in this research are available at Nucleotide database of National Center for Biotechnology Information (http://www.ncbi.nlm.nih.gov). Also, comprehensive and more complete information about the endophytic fungi used in this research are available online (https://doi.org/10.1093/jambio/lxac015; https://doi.org/10.7717/peerj.8309).
Abbreviations
- APU-LIPG:
-
Area percentage under the light intensity-pixels graph
- CTAB:
-
Cetyl-trimethyl ammonium bromide extraction protocol
- PCR:
-
Polymerase chain reaction
- PDA:
-
Potato Dextrose Agar
- PDB:
-
Potato Dextrose Broth
- THENG:
-
Buffer solution comprising Tris, HCl, EDTA, NaCl, and glycerol
- THENG-tsp:
-
Application of THENG buffer in conjunction with a particular thermal shock procedure as an innovative DNA extraction method
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Acknowledgements
The authors are grateful to professor Hassan Vatandoost (Department of Medical Entomology and Vector Control, School of Public Health, Tehran University of Medical Sciences) and professor James Francis White (Department of Plant Biology, Rutgers University) for their valuable scientific advices during this research project.
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All authors contributed to the study conception and design. Performing all tests, visualization, investigation and methodology were performed by Sareh Hatamzadeh. Data analysis and writing the original draft were performed by Nima Akbari Oghaz. Conceptualization, supervision, validation, review and editing original draft were performed by Kamran Rahnama and Fatemeh Noori. All participating authors read, commented and approved on previous versions of the manuscript.
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Hatamzadeh, S., Akbari Oghaz, N., Rahnama, K. et al. Combination of a hierarchical and thermal shock process with a specific aqueous buffer: a safe, rapid and reliable DNA extraction method for plant endophytic fungi. Biologia 79, 597–604 (2024). https://doi.org/10.1007/s11756-023-01579-0
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DOI: https://doi.org/10.1007/s11756-023-01579-0