Abstract
Puccinia kuehnii is a fungal pathogen that causes orange rust in sugarcane, which is now prevalent in many countries. At the early stage of disease, it is almost indistinguishable from brown rust, which is caused by Puccinia melanocephala. Although several PCR assays are available to detect these diseases, the loop-mediated isothermal amplification (LAMP)-based assay has been reported to be more economical and easier to perform. Under isothermal conditions, DNA is amplified with high specificity and rapidity. Moreover, visual judgment of color change without further post-amplification processing makes the method convenient. The present study was undertaken to detect P. kuehnii genomic DNA using four primers corresponding to a unique DNA sequence of P. kuehnii. The LAMP assay was found to be optimal when 8 mM MgSO4 was used and the reaction was incubated at 63 °C for 90 min. Positive samples showed a color change from orange to green upon SYBR Green I dye addition. Specificity of the LAMP test was checked with DNA of P. melanocephala, which showed no reaction. Sensitivity of the LAMP method was observed to be the same as real-time PCR at 0.1 ng, thus providing a rapid and more affordable option for early disease detection.
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Acknowledgments
Amaresh Chandra is grateful to the Department of Biotechnology, Government of India, New Delhi, India for awarding the DBT-CREST Fellowship (BT/IN/DBT-CREST Awards/05/AC/2012-12). Amber Keizerweerd and Michael Grisham are thankful for financial support provided by the United States Department of Agriculture, Agriculture Research Service (CRIS Project: 6410-22000-013-00D). Thanks are also due to Kathryn Warnke for her technical support in conducting the real-time PCR assay. We also thank Dr. Duncan Clark of OptiGene Limited for his assistance in primer design.
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Chandra, A., Keizerweerd, A.T. & Grisham, M.P. Detection of Puccinia kuehnii Causing Sugarcane Orange Rust with a Loop-Mediated Isothermal Amplification-Based Assay. Mol Biotechnol 58, 188–196 (2016). https://doi.org/10.1007/s12033-016-9914-5
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DOI: https://doi.org/10.1007/s12033-016-9914-5