Research conducted in China may hold significant implications for the sustainable development of citriculture amid the ongoing global HLB epidemic. The work offers novel insights into vascular immunity and plant defense responses.
The article (Single-nucleus transcriptomics reveals the cellular immune responses to Candidatus Liberibacter asiaticus in rough lemon) appeared in the January 2026 issue of Horticulture Research. The authors are Xu-Bin Tian, Jinhuan Zhou, Jiaxin Li, Yayu Li, Changyong Zhou and Zhen Song, all with the Citrus Research Institute of Southwest University.
The article notes that HLB is the most destructive disease in citriculture, mainly caused by Candidatus Liberibacter asiaticus (CLas). However, the immune response of citrus to CLas at the cellular level remains to be elucidated, it states.
In the early stages of the study, the first single-cell atlas of rough lemon root apexes were generated using single-nucleus RNA sequencing at 20 weeks post-inoculation with CLas. The authors report that the study collectively provides insights into the cellular innate immunity responses of citrus to CLas infection.
According to the authors, “The present study demonstrates that citrus plants establish a multifaceted defensive system during CLas infection by modifying cell fate and initiating specific gene expression patterns. This includes the upregulation of genes encoding secondary metabolites, primarily in xylem cells, and the enhancement of cell lignification to inhibit phloem cell development.”
The research identifies DOF2.4 as a candidate gene with potential dual roles in regulating vascular cell development and enhancing plant resistance.
“This gene represents a promising target for enhancing the balance between growth and stress tolerance in citrus plants in response to CLas infection,” stated the researchers. “Future studies will aim to elucidate the molecular mechanisms by which DOF2.4, in coordination with plant hormone signals, modulates citrus resistance to CLas.”
See the full research article here.
Source: Horticulture Research
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