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Poster

Session: Session 2 Presenting Authors at Posters (Odds)

P-097 - The Pseudomonas syringae conserved effector locus is a prominent target of soybean effector-triggered immunity

Wednesday, July 16, 2025
13:30 - 15:15  
Location: Confex Hall 3
Discrimination of friend from foe

    Presenting Author(s)

  • YL

    Yan Lai

    Post Doc
    Department of cell and Systems Biology, University of Toronto
    Toronto, Ontario, Canada

    • Author(s)

  • CB

    Clare Breit-McNally (she/her/hers)

    Department of Cell and Systems Biology, University of Toronto
    Toronto, Ontario, Canada

  • BL

    Bradley Laflamme

    Department of Cell and Systems Biology, University of Toronto
    Toronto, Ontario, Canada

  • TA

    Tamar V. Av-Shalom (she/her/hers)

    PhD Candidate
    Department of Cell and Systems Biology, University of Toronto
    Toronto, Ontario, Canada

  • NM

    Nadia Morales-Lizcano

    Department of cell and Systems Biology, University of Toronto
    Toronto, Ontario, Canada

  • PW

    Pauline Wang

    Department of cell and Systems Biology, University of Toronto
    Toronto, Ontario, Canada

  • DD

    Darrell Desveaux

    Professor
    Department of cell and Systems Biology, University of Toronto
    Toronto, Ontario, Canada

  • DG

    David S. Guttman

    Professor
    Department of Cell and Systems Biology, University of Toronto
    Toronto, Ontario, Canada

Soybean (Glycine max) is one of the most economically important crops in the world. The Soybean- Pseudomonas syringe pathosystem was one of the original model systems to investigate effector-triggered immunity (ETI), leading to the cloning of the first ETI-eliciting effectors in P. syringae. Here, we performed a systematic screen of the ETI responses in both cultivated soybean cultivar Lee 74 and wild soybean (Glycine soja) PI 483463 against the bacterial pathogen P. syringae. This screen uncovered an extensive ETI landscape with 121 alleles (22.9%) from 32 effector families (45.7%) and 125 alleles (23.6%) from 23 effector families (32.9%) eliciting ETI in Lee 74 and PI 483463 respectively. Despite reduced genetic diversity often observed during domestication, ETI diversity in cultivated soybean seems to be expanded compare to the wild relative. While ETI responses are both widespread in soybean and the previous study in Arabidopsis thaliana, soybean recognized most of the A. thaliana ETI-eliciting effector families (17/21) and 18 novel ETI- eliciting effector families were discovered in our study. Interestingly, the conserved effector locus (CEL) effectors (AvrE, HopM and HopAA) are the most prevalent ETI- eliciting effector families in soybean. Overall, we are providing a comprehensive ETI interaction landscape between soybean and P. syringe, laying the foundation for the discovery of novel plant immune receptors serving the agronomic improvement of soybean.