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POSTERS: Genetics of Resistance II

P-252 - Pangenome analysis of Citrus provides insight into genetic factors for resistance against Candidatus Liberibacter asiaticus

Tuesday, August 5, 2025
9:30 AM - 10:15 AM HST
Location: Exhibit Hall 3

    Presenting Author(s)

  • JW

    Jiawen Wen

    Graduate Research Assistant
    University of Florida Citrus Research and Education Center
    Lake Alfred, Florida, United States

    • Author(s)

  • CH

    Connor Hendrich

    University of Florida Citrus Research and Education Center
    Lake Alfred, Florida, United States

  • JX

    Jin Xu

    University of Florida Citrus Research and Education Center
    Lake Alfred, Florida, United States

  • ZP

    Zhiqian Pang

    University of Florida Citrus Research and Education Center
    Lake Alfred, Florida, United States

  • NW

    Nian Wang

    Professor
    University of Florida
    Lake Alfred, FL, USA

Abstract Text:

Citrus Huanglongbing (HLB) is a devastating disease worldwide. Most commercial citrus varieties are susceptible. However, Swinglea glutinosa, a citrus relative that can be used as a citrus rootstock, shows resistance to Candidatus Liberibacter asiaticus (CLas), the causative agent of HLB. Australian limes also show resistance to CLas. Here, we sequenced the haplotype-resolve genome of S. glutinosa. We further conducted comparative genomic analysis of 25 HLB-resistant and -susceptible citrus varieties and their relatives to reveal genetic mechanisms underlying resistance to HLB. A total of 40,756 gene families were identified, and 23.7% of the gene families were core gene families. We have analyzed unique genes in HLB resistant varieties with the focus on immune related genes including NLRs, antimicrobials, PR genes, and ROS genes. Our study provides valuable insights regarding HLB resistance mechanism, which will assist future citrus genetic improvement against HLB.