Abstract
Key message
Overexpression of CiNPR4 enhanced resistance of transgenic citrus plants to Huanglongbing by perceiving the salicylic acid and jasmonic acid signals and up-regulating the transcriptional activities of plant–pathogen interaction genes.
Abstract
Developing transgenic citrus plants with enhanced immunity is an efficient strategy to control citrus Huanglongbing (HLB). Here, a nonexpressor of pathogenesis-related gene 1 (NPR1) like gene from HLB-tolerant ‘Jackson’ grapefruit (Citrus paradisi Macf.), CiNPR4, was introduced into ‘Wanjincheng’ orange (Citrus sinensis Obseck). CiNPR4 expression was determined in transgenic citrus plants using quantitative real-time PCR analyses. The Candidatus Liberibacter asiaticus (CLas) pathogen of HLB was successfully transmitted to transgenic citrus plants by grafting infected buds. HLB symptoms developed in transgenic and wild-type (WT) plants by 9 months after inoculation. A CLas population analysis showed that 26.9% of transgenic lines exhibited significantly lower CLas titer levels compared with the CLas-infected WT plants at 21 months after inoculation. Lower starch contents and anatomical aberration levels in the phloem were observed in transgenic lines having enhanced resistance compared with CLas-infected WT plants. CiNPR4 overexpression changed the jasmonic acid, but not salicylic acid, level. Additionally, the jasmonic acid and salicylic acid levels increased after CLas infection. Transcriptome analyses revealed that the enhanced resistance of transgenic plants to HLB resulted from the up-regulated transcriptional activities of plant–pathogen interaction-related genes.
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Acknowledgements
This work was supported by the grants from the National Key R&D Program of China (2018YFD0201500), the Key-Area Research and Development Program of Guangdong Province (2018B020202009), Science and Technology Major Project of Guangxi (Gui Ke AA18118046-6) and the Earmarked Fund for China Agriculture Research System (CARS-26). We thank Lesley Benyon, PhD, from Liwen Bianji, Edanz Group China (www.liwenbianji.cn/ac), for editing the English text of a draft of this manuscript.
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AP constructed the plasmid, performed the resistance evaluation of transgenic plants and wrote the manuscript. XZ performed the RNA-seq analysis. YH and SC performed citrus transformations and analyzed the GUS activities of regenerants. XL performed the phylogenetic analysis and amino acid sequence alignment. JZ performed the starch content analysis. QZ and ZX observed the anatomical phloem structures. JL performed the PCR and expression analyses. XZ designed the experiments and revised the manuscript. All the authors have read and approved the manuscript.
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Peng, A., Zou, X., He, Y. et al. Overexpressing a NPR1-like gene from Citrus paradisi enhanced Huanglongbing resistance in C. sinensis. Plant Cell Rep 40, 529–541 (2021). https://doi.org/10.1007/s00299-020-02648-3
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DOI: https://doi.org/10.1007/s00299-020-02648-3