The fitness costs of individual resistance (R) genes detected in previous studies suggest an impossibly high genetic load associated with disease resistance, if true for all R genes. However, new research shows that Arabidopsis plants with resistant Rps2 are no less fit than those with a susceptible Rps2 allele in the absence of disease.
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Laine, AL. Disease resistance: Not so costly after all. Nature Plants 2, 16121 (2016). https://doi.org/10.1038/nplants.2016.121