Abstract
Biotrophic fungi, such as Puccinia striiformis f. sp. tritici, because they cannot be cultured on nutrient media, to obtain adequate quantity of DNA for molecular genetic analysis, are usually propagated on living hosts, wheat plants in case of P. striiformis f. sp. tritici. The propagation process is time-, space- and labor-consuming and has been a bottleneck to molecular genetic analysis of this pathogen. In this study we evaluated multiple displacement amplification (MDA) of pathogen genomic DNA from urediospores as an alternative approach to traditional propagation of urediospores followed by DNA extraction. The quantities of pathogen genomic DNA in the products were further determined via real-time PCR with a pair of primers specific for the β-tubulin gene of P. striiformis f. sp. tritici. The amplified fragment length polymorphism (AFLP) fingerprints were also compared between the DNA products. The results demonstrated that adequate genomic DNA at fragment size larger than 23 Kb could be amplified from 20 to 30 urediospores via MDA method. The real-time PCR results suggested that although fresh urediospores collected from diseased leaves were the best, spores picked from diseased leaves stored for a prolonged period could also be used for amplification. AFLP fingerprints exhibited no significant differences between amplified DNA and DNA extracted with CTAB method, suggesting amplified DNA can represent the pathogen’s genomic DNA very well. Therefore, MDA could be used to obtain genomic DNA from small precious samples (dozens of spores) for molecular genetic analysis of wheat stripe rust pathogen, and other fungi that are difficult to propagate.
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Acknowledgments
Thanks to all plant protection staffs in Sichuan and Gansu provinces for providing wheat stripe rust samples. This work was supported by National Basic Research Program (2013CB127700) and National Science and Technology Support Project (2012BAD19B04).
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Communicated by Z. Zhang.
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Zhang, R., Ma, Z.H. & Wu, B.M. Multiple displacement amplification of whole genomic DNA from urediospores of Puccinia striiformis f. sp. tritici . Curr Genet 61, 221–230 (2015). https://doi.org/10.1007/s00294-014-0470-x
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DOI: https://doi.org/10.1007/s00294-014-0470-x