A pandemic clonal lineage of the wheat blast fungus

  • Published:
  • Authors: Latorre SM, Were VM, Foster AJ, Langner T, Malmgren A, Harant A, Asuke S, Reyes-Avila S, Gupta DR, Jensen C, Ma W, Mahmud NU, Mehebub S, Mulenga RM, Muzahid ANM, Paul S, Rabby FSM, Raha AAM, Ryder L, Shrestha RK, Sichilima S, Soanes DM, Singh PK, Bentley AR, Saunders DGO, Tosa Y, Croll D, Lamour KH, Islam T, Tembo B, Win J, Talbot NJ, Burbano HA, Kamoun S (2022)
  • Reference: bioRxiv Preprint 07 Jun 2022 doi: https://doi.org/10.1101/2022.06.06.494979

Wheat, the most important food crop, is threatened by a blast disease pandemic. Here, we show that a clonal lineage of the wheat blast fungus recently spread to Asia and Africa following two independent introductions from South America. Through a combination of genome analyses and laboratory experiments, we show that the decade-old blast pandemic lineage can be controlled by the Rmg8 disease resistance gene and is sensitive to strobilurin fungicides. However, we also highlight the potential of the pandemic clone to evolve fungicide-insensitive variants and sexually recombine with African lineages. This underscores the urgent need for genomic surveillance to track and mitigate the spread of wheat blast outside of South America, and to guide pre-emptive wheat breeding for blast resistance.