Bibliographic Details
| Title: |
A Réévaluation of Phylogenomic Data Reveals that Current Understanding in Wheat Blast Population Biology and Epidemiology Is Obfuscated by Oversights in Population Sampling. |
| Authors: |
Farman, Mark L.1 farman@uky.edu, Ascari, Joao P.2, Rahnama, Mostafa1, Del Ponte, Emerson M.2, Pedley, Kerry F.3, Martinez, Sebastián4, Fernandes, José Mauricio C.5, Valent, Barbara6 |
| Superior Title: |
Phytopathology. Jan2024, Vol. 114 Issue 1, p220-225. 6p. |
| Subject Terms: |
*POPULATION biology, *WHEAT, *PYRICULARIA oryzae, *GENE flow, *EPIDEMIOLOGY, *WINTER wheat |
| Geographic Terms: |
ZAMBIA, BANGLADESH, BRAZIL |
| Abstract: |
Wheat blast, caused by the Pyricularia oryzae Triticum lineage (PoT), first emerged in Brazil and quickly spread to neighboring countries. Its recent appearance in Bangladesh and Zambia highlights a need to understand the disease's population biology and epidemiology so as to mitigate pandemic outbreaks. Current knowledge is mostly based on characterizations of Brazilian wheat blast isolates and comparison with isolates from non-wheat, endemic grasses. These foregoing studies concluded that the wheat blast population lacks host specificity and, as a result, undergoes extensive gene flow with populations infecting nonwheat hosts. Additionally, based on genetic similarity between wheat blast and isolates infecting Urochloa species, it was proposed that the disease originally emerged via a host jump from this grass and that Vrochloa likely plays a central role in wheat blast epidemiology owing to its widespread use as a pasture grass. However, due to inconsistencies with broader phylogenetic studies, we suspected that these seminal studies had not actually sampled the populations normally found on endemic grasses and, instead, had repeatedly isolated members of PoT and the related Lolium pathogen lineage (PoLl). Re-analysis of the Brazilian data as part of a comprehensive, global, phylogenomic dataset that included a small number of South American isolates sampled away from wheat confirmed our suspicion and identified four new P. oryzae lineages on grass hosts. As a result, the conclusions underpinning current understanding in wheat blast's evolution, population biology, and epidemiology are unsubstantiated and could be equivocal. [ABSTRACT FROM AUTHOR] |
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| Database: |
Academic Search Premier |
