What can we learn from population genomics studies of Curtobacterium flaccumfaciens pv. flaccumfaciens, the cause of tan spot on mungbean?

Vaghefi, N. and Adorada, D. ORCID: https://orcid.org/0000-0001-5290-1781 and Adorada, E. and Kelly, L. and Young, A. and Sparks, A. ORCID: https://orcid.org/0000-0002-0061-8359 (2019) What can we learn from population genomics studies of Curtobacterium flaccumfaciens pv. flaccumfaciens, the cause of tan spot on mungbean? In: 22nd Biennial Australasian Plant Pathology Society Conference: Strong Foundations, Future Innovations (APPS 2019), 25-28 Nov, 2019, Melbourne, Australia.

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Abstract

The bacterium Curtobacterium flaccumfaciens pv. flaccumfaciens (Cff) is the cause of tan spot (in some regions known as ‘wilt’) on mungbean (Vigna radiata) and other legumes worldwide. The pathogen was first reported in mungbean paddocks in Queensland in 1984, and subsequently in New South Wales in 1986, causing yield losses of up to 25% in hot and dry seasons. No chemical control is available, and disease management relies on pathogen exclusion, through the use of clean seed, and deployment of moderately susceptible varieties. Breeding programs are currently working to incorporate better resistance into new mungbean varieties. The success of breeding programs depends on a thorough understanding of the genetic diversity and evolution of the pathogen population(s). This project was designed to elucidate the genotypic diversity of Cff population(s) and investigate sources of inoculum that contribute to tan spot epidemics in the northern grains region (Queensland and northern New South Wales). Whole genome re-sequencing of 100 Cff isolates detected moderate genotypic diversity, with a narrower genetic background compared to the global Cff population. One highly adapted clonal lineage was found to dominate the population with a frequency of 45%. This study showcases how population genomics studies can be used to test hypotheses relating to disease epidemiology and provide useful information for resistance breeding programs. The results provide insights on Cff population structure and epidemiology, and have direct application for breeding programs by providing a set of Cff isolates that represent the genetic diversity of the pathogen population(s) in the northern grains region.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: No
Item Status: Live Archive
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: 20 Aug 2020 02:05
Last Modified: 09 Oct 2020 04:33
Uncontrolled Keywords: Curtobacterium flaccumfaciens pv. flaccumfaciens (Cff); tan spot; mungbean; yield losses; dry season; Queensland; Northern Region
Fields of Research (2008): 07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070308 Crop and Pasture Protection (Pests, Diseases and Weeds)
Fields of Research (2020): 30 AGRICULTURAL, VETERINARY AND FOOD SCIENCES > 3004 Crop and pasture production > 300409 Crop and pasture protection (incl. pests, diseases and weeds)
Socio-Economic Objectives (2008): D Environment > 96 Environment > 9604 Control of Pests, Diseases and Exotic Species > 960413 Control of Plant Pests, Diseases and Exotic Species in Farmland, Arable Cropland and Permanent Cropland Environments
URI: http://eprints.usq.edu.au/id/eprint/38459

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