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The present study was designed to serve as a comprehensive analysis of  Citrus sinensis  ( C. sinensis ) pectin acetylesterases (CsPAEs), and to assess the roles of these PAEs involved in the development of citrus bacterial canker (CBC) caused by  Xanthomonas citri  subsp.  citri  ( Xcc ) infection. A total of six  CsPAEs  were identified in the genome of  C. sinensis , with these genes being unevenly distributed across chromosomes 3, 6, and 9, and the unassembled scaffolds. A subset of  CsPAEs  were found to be involved in responses to  Xcc  infection. In particular,  CsPAE2  was identified to be associated with such infections, as it was upregulated in CBC-susceptible variety Wanjincheng and inversely in CBC-resistant variety Calamondin. Transgenic citrus plants overexpressing  CsPAE2  were found to be more susceptible to CBC, whereas the silencing of this gene was sufficient to confer CBC resistance. Together, these findings provide evolutionary insights into and functional information about the CsPAE family. This study also suggests that  CsPAE2  is a potential candidate gene that negatively contributes to bacterial canker disease and can be used to breed CBC-resistant citrus plants.

international journal of molecular sciences

Systematic Analysis and Functional Validation of Citrus Pectin Acetylesterases (CsPAEs) Reveals that CsPAE2 Negatively Regulates Citrus Bacterial Canker Development