Review for "Wheat blast disease caused by Pyricularia graminis-tritici sp. nov."

Completed on 3 May 2016 by Mark Farman. Sourced from

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Comments to author

As stated by the authors: The Oryzae and Triticum pathotypes of P. oryzae from Brazil display a level of differentiation comparable to that reported between accepted species such as P. grisea and P. oryzae (Couch & Kohn 2002, Couch et al. 2005), or the new cryptic species recently identified within Pyricularia (Hirata et al. 2007, Choi et al. 2013, Klaubauf et al. 2014). In truth, they know this not to be true because the data below have been shared with them on multiple occasions (Oryzae and Triticum strains are in the dense group at the top. Scale is % divergence). They choose to ignore these data because they do not support the new species hypothesis.

Let's see how the proposed new Pgt species maps on a phylogenetic tree based on whole genome data. Below is a neighbor-joining tree built using genetic distances assessed across the whole genome. Gray shaded ovals encompass strains that fall under the proposed Pgt umbrella. Placements seem kind of arbitrary, don't they?