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Crop and Pasture Science Crop and Pasture Science Society
Plant sciences, sustainable farming systems and food quality
RESEARCH ARTICLE (Open Access)

Naked eye evaluation and quantitative detection of the sugarcane leaf scald pathogen, Xanthomonas albilineans, in sugarcane xylem sap

Muhammad Umer https://orcid.org/0000-0001-9983-0087 A , Nahian Binte Aziz B C , Salma Al Jabri B , Shamsul A. Bhuiyan https://orcid.org/0000-0001-7245-670X A C D and Muhammad J. A. Shiddiky https://orcid.org/0000-0003-4526-4109 A B D
+ Author Affiliations
- Author Affiliations

A Queensland Micro- and Nanotechnology Centre (QMNC), Griffith University, Nathan Campus, Qld 4111, Australia.

B School of Environment and Science (ESC), Griffith University, Nathan Campus, Nathan, Qld 4111, Australia.

C Sugar Research Australia, Woodford, Qld 4514, Australia.

D Corresponding authors. Email: sbhuiyan@sugarresearch.com.au; m.shiddiky@griffith.edu.au

Crop and Pasture Science 72(5) 361-371 https://doi.org/10.1071/CP20416
Submitted: 22 October 2020  Accepted: 10 March 2021   Published: 26 May 2021

Journal Compilation © CSIRO 2021 Open Access CC BY-NC-ND

Abstract

Sugarcane leaf scald caused by the bacterium Xanthomonas albilineans is a major disease of sugarcane worldwide. Whereas erratic symptoms make phenotypic detection challenging, molecular methods require expensive instruments and labour, and longer sample-to-answer times. We report a novel method for detection of X. albilineans DNA in sugarcane xylem sap. The method involves (i) boiling lysis-based DNA extraction from sugarcane sap; (ii) magnetic purification of target sequences directly from the lysate through use of magnetic bead-bound capture probes; and (iii) DNA sandwich hybridisation platform for HRP/TMB/H2O2 reaction-based naked eye visualisation and electrochemical detection of the target. The method is sensitive (limit of detection 100 fM) and reproducible (relative standard deviation <7%) with linear dynamic range 100 fM–1 nM (R2 = 0.99). The method was tested on a range of sugarcane cultivars of known resistance ratings (susceptible, intermediate resistant, and resistant) for leaf scald disease from an inoculated field trial. Detection levels agreed with the resistance rating of cultivars tested. In addition, qPCR results strongly correlated with our assay (r = 0.91–0.99, P < 0.01) and cultivar resistance rating. We believe that our assay could be useful for rapid screening as well as sensitive quantification of target pathogen DNA in infected sugarcane plants.

Keywords: leaf scald disease, Xanthomonas albilineans detection, naked eye evaluation of leaf scald disease, electrochemical detection of leaf scald disease, sugarcane xylem sap.


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