title: Detection of Puccinia kuehnii Causing Sugarcane Orange Rust with a Loop-Mediated Isothermal Amplification-Based Assay.
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.
authors.affiliation: Sugarcane Research Unit, USDA, ARS, 5883 USDA Road, Houma, LA, 70360, USA. amaresh_chandra@rediffmail.com.|Indian Institute of Sugarcane Research, Lucknow, 226 002, India. amaresh_chandra@rediffmail.com.
authors.forename: Amaresh
authors.initials: A
authors.lastname: Chandra
authors.affiliation: Sugarcane Research Unit, USDA, ARS, 5883 USDA Road, Houma, LA, 70360, USA. amber.keizerweerd@ars.usda.gov.
authors.forename: Amber T
authors.initials: AT
authors.lastname: Keizerweerd
authors.affiliation: Sugarcane Research Unit, USDA, ARS, 5883 USDA Road, Houma, LA, 70360, USA. michael.grisham@ars.usda.gov.
authors.forename: Michael P
authors.initials: MP
authors.lastname: Grisham
mesh_terms: D001487:Basidiomycota / Q000235:genetics / Q000302:isolation & purification*; D004271:DNA, Fungal / Q000032:analysis; D021141:Nucleic Acid Amplification Techniques / Q000379:methods*; D010935:Plant Diseases / Q000382:microbiology; D031786:Saccharum / Q000382:microbiology*; D012680:Sensitivity and Specificity; D013696:Temperature
chemical_list: D004271:DNA, Fungal
keywords: Bst DNA polymerase; LAMP; Orange rust; Puccinia kuehnii; Sugarcane
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