Dr. Paulo Teixeira, Professor at "Luiz de Queiroz" College of Agriculture, University of São Paulo Nonhost plants as a source of immune receptors against pathogens of agricultural importance Plants use NLR receptors to detect effectors from pathogens and activate defense responses. However, most immune receptors in the plant kingdom remain uncharacterized, especially those in nonhost plants that are resistant to a wide range of pathogens of agricultural importance. Here, we examined whether nonhost Solanaceae species can recognize effectors from the citrus pathogen Xanthomonas citri subsp. citri. We transiently expressed 22 effectors in tomato, eggplant, Nicotiana benthamiana and N. tabacum and found that these nonhost plants recognized a distinct, but overlapping, set of effectors. Interestingly, XopAZ was recognized by all species, indicating the presence of conserved NLR receptors that respond to this effector. We subsequently identified a novel pair of TIR-NLRs in Solanaceae that is required for XopAZ recognition. I will discuss how this approach may facilitate the identification of immune receptors that could be transferred to crops as a strategy to combat diseases.
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