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Papain-like cysteine proteases (PLCPs) play important roles in plant-pathogen interactions. In citrus, PLCPs are targeted by effectors from  Candidatus  Liberibacter asiaticus (CLas), the causal agent of Huanglongbing (HLB). To study interactions between  Citrus sinensis  and CLas, we identified 33 candidate  CsPLCP  genes by HMMsearch with the Peptidase_C1 domain (PF00112), and further confirmed them using local BLAST with PLCP sequences from  Arabidopsis thaliana . The 33  CsPLCPs  were classified into 9 subfamilies. Analysis of the cis-acting elements in their promoters indicated that  CsPLCPs  are responsive to various phytohormones and stressors. Further qPCR analysis indicated that several  CsPLCPs  were up-regulated during CLas infection. Subcellular localization analysis indicated that five CsPLCPs were localized to the cytoplasm and nucleus, while CsXBCP2 was localized only to the cytoplasm. In summary, this study provides a sound basis for understanding the roles of  CsPLCPs  in the Citrus-CLas interaction.

journal of plant interactions

Genome-wide identification of papain-like cysteine proteases in  Citrus sinensis  and expression analysis in response to  Candidatus  Liberibacter asiaticus