Abstract
Wheat blast, caused by Pyricularia oryzae Triticum lineage (PoTl), can infect wheat leaves and heads. More information is needed on the pathogen biology and disease epidemiology of the isolate PoTl for the integrated management of wheat blast in Brazilian wheat fields. This study aimed to characterize the incubation period, latent period, and the temporal progress of wheat blast and to fit nonlinear models, describing the nature of an epidemic of the PoTl isolate 12.1.146 compared with the PoTl isolate Py6038, throughout five successive infection cycles of PoTl on wheat leaves and heads. Wheat blast occurred in all infection cycles. The incubation period and latent period of the PoTl isolate 12.1.146 were significantly shorter than that of the PoTl isolate Py6038. The secondary inocula produced by the PoTl isolate on symptomatic wheat leaves caused blast symptoms when inoculated on wheat heads. The area under the disease progress curve (AUDPC) was calculated based on disease severity. In all infection cycles, the AUDPC of the PoTl isolate 12.1.146 was significantly higher than that of the PoTl isolate Py6038. Between the 1st and 5th infection cycle, a significant reduction was observed in the AUDPC of the PoTl isolates. The nonlinear logistic model describe the disease progress curves (DPCs) of PoTl isolates on wheat leaves and heads best. Our findings indicate that the PoTl isolates did not maintain the same temporal dynamics after five successive infection cycles. These findings may have implications for the integrated management of the wheat blast pathogen in Brazilian fields.
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The epidemiological data that supports the findings of this study are available upon request.
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Acknowledgements
Adriano Francis Dorigan was supported by Brazilian Coordination for the Improvement of Higher Education Personnel (CAPES, finance code 001). Silvino Intra Moreira was supported by PDJ/CNPq Postdoc Scholarship (152074/2022-8). Paulo Cezar Ceresini was supported by São Paulo Research Support Foundation, Brazil (Fapesp 2020/07611-9). Eduardo Alves is supported by the National Council for Scientific and Technological Development (CNPq 305482/2017-3, 313825/2018-1, 432445/2018-8, and 306133/2021-0).
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Dorigan, A.F., Pozza, E.A., Pereira, R.C.M. et al. Temporal dynamics of wheat blast caused by Pyricularia oryzae Triticum lineage throughout the successive wheat cycles. Eur J Plant Pathol (2024). https://doi.org/10.1007/s10658-024-02867-4
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DOI: https://doi.org/10.1007/s10658-024-02867-4