Pathogenicity and copper tolerance in Australian Xanthomonas species associated with bacterial leaf spot

Roach, R. and Mann, R. and Gambley, C. G. and Shivas, R. G. and Chapman, T. and Rodoni, B. (2020) Pathogenicity and copper tolerance in Australian Xanthomonas species associated with bacterial leaf spot. Crop Protection, 127. pp. 1-11. ISSN 0261-2194


Abstract

Recent studies into the distribution of Xanthomonas species causing Bacterial Leaf Spot (BLS) in Australian solanaceous crops detail varied genomic profiles that may influence pathogenicity. These genomic studies are expanded upon here by reporting the pathogenicity, race and copper tolerance of the previously sequenced Xanthomonas strains. Capsicum (Yolo Wonder), tomato (Grosse Lisse) and differential lines of capsicum (Early Cal-Wonder) were used to determine pathogenicity and race. Copper tolerance of 44 Xanthomonas strains was measured by observing bacterial growth on copper sulphate amended media. Protein sequence associated with these traits was detected using genomic analysis and compared using protein alignments. Only strains of X. euvesicatoria (16 strains) were found to be pathogenic on both tomato and capsicum. These were determined to be race 4 and 9. High copper tolerance was detected in the majority of Xanthomonas strains tested. Multiple copper resistance and avirulence proteins were detected in genomic sequence. Relatively few of these were associated with plasmid sequences. The genomic basis for copper tolerance was determined to be complex, as the tolerance thresholds did not directly correlate with gene number or presence. Similarly, pathogenicity of the strains was also not always clearly linked with presence or absence of specific Avr genes. This study highlights the need for detailed and ongoing investigations into the function of these proteins and how they produce the phenotypes that affect crop production.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Crop Health (24 Mar 2014 -)
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Crop Health (24 Mar 2014 -)
Date Deposited: 21 Jan 2020 05:16
Last Modified: 07 May 2020 22:33
Uncontrolled Keywords: Pathogenicity; Copper tolerance; Race
Fields of Research : 07 Agricultural and Veterinary Sciences > 0706 Horticultural Production > 070603 Horticultural Crop Protection (Pests, Diseases and Weeds)
06 Biological Sciences > 0605 Microbiology > 060501 Bacteriology
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970106 Expanding Knowledge in the Biological Sciences
E Expanding Knowledge > 97 Expanding Knowledge > 970107 Expanding Knowledge in the Agricultural and Veterinary Sciences
Identification Number or DOI: 10.1016/j.cropro.2019.104923
URI: http://eprints.usq.edu.au/id/eprint/37275

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