Abstract
Fusarium crown rot (FCR) caused by the fungus Fusarium pseudograminearum (Fp) is an important disease of wheat that reduces yield and grain quality in many countries, including Australia. In this study, we investigated mating type idiomorph composition, putative chemotype and population genotypic structure of 98 Fp isolates from Western Australia (WA) and the eastern Australian states of New South Wales, Victoria and South Australia. Our results revealed the expected 1:1 mating type ratio for isolates from the eastern states while there was significant variation to a 1:1 mating type composition with isolates from WA. A chemotype-specific PCR assay indicated that all Fp isolates from eastern states and WA segregated for the 3-ADON trichothecene chemotype. Genetic diversity assessed using 21 cleaved amplified polymorphic sequence markers revealed a high level of genotypic variation within and between Fp populations from eastern Australian states and WA. Analysis of molecular variance (AMOVA) showed significant difference between populations from eastern states and WA. The genetic diversity measured by Shannon index ranged from 0.95 to 2.30 with the lowest and highest values detected in Hart and Rowena populations, respectively in the eastern states. Index of association analysis showed no significant linkage of markers among isolates within 60% of the populations, suggesting that sexual reproduction may be occurring in the pathogen from those locations. These results improve understanding of Fp population dynamics across Australia and highlight the importance of monitoring for shifts in the population which could have implications for disease management.
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Acknowledgements
Stubble samples from which we collected Fp isolates for this study were kindly supplied by Dr. Daniel Hüberli (Department of Primary Industries and Regional Development) for WA, Dr. Margaret Evans (SARDI) for SA, Dr. Andrew Milgate (NSW DPI) for Cowra and Wagga Wagga, Dr. Grant Hollaway for Horsham and Simon Craig (Birchip Cropping Group) for Birchip. The resulting collection, isolation and DNA extraction of samples from the 98 isolates from the SARDI population was funded by the Grains Research and Development Corporation projects DAN00175 and DAS00137. M. Khudhair was supported by a PhD fellowship from the Iraqi Ministry of Science and Technology.
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Supplementary figure 1
Structure analysis using 2.3.4. software grouped the Fusarium pseudograminearum populations from Western Australia (WA) and eastern Australian states of New South Wales (NSW), Victoria (Vic) and South Australia (SA) into four putative groups. (PDF 119 kb)
Supplemental Table 1
The 21 polymorphic cleaved amplified polymorphic sequence (CAPS) primers used to study the genotypic diversity of Fusarium pseudograminearum from Western Australia and Eastren Australian states wheat fields. (DOCX 16.5 kb)
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Khudhair, M., Obanor, F., Kazan, K. et al. Genetic diversity of Australian Fusarium pseudograminearum populations causing crown rot in wheat. Eur J Plant Pathol 159, 741–753 (2021). https://doi.org/10.1007/s10658-020-02198-0
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DOI: https://doi.org/10.1007/s10658-020-02198-0