Abstract
Huanglongbing (HLB, Citrus greening), caused by a phloem-limited fastidious gram-negative bacterium, “Candidatus Liberibacter spp.”, is one of the devastating diseases of citrus worldwide. The pathogen belongs to the alpha-proteobacteria group and is classified on the basis of its geographical origin and 16S rRNA sequence diversity. Although the disease has been reported from all citrus growing states of India, the status and the molecular variability among the isolates from the Northern part of the country is unknown. A total of five different HLB isolates originating from Northern India showing variable symptoms were studied. The genomic regions of four different genes, i.e., 16S rRNA, intergenic 16S/23S rRNA spacer region, rplA-rplJ, and CLIBASIA_01645 were amplified by PCR, sequenced, and variations in these sequences were assessed. Analysis of 16S rRNA clearly indicated that all five isolates fit in to ‘Candidatus Liberibacter asiaticus’ (CLas) group. However, 16S/23S rRNA intergenic spacer region-based analysis failed to segregate these isolates beyond species level. Sequence analysis of rplA-rplJ gene and CLIBASIA_01645 loci also confirmed the existence of diversity among the ‘CLas’ in the surveyed areas. Further, 16S rRNA and rplA-rplJ-based SNP analysis revealed that some isolates segregated into three new lineages, two on the basis of 16Sr (16Sr-XV and 16Sr-XVI), and one based on β-rp (rp-IV), respectively. A tandem repeat number (TRN) at CLIBASIA_01645 region were TRN = 5, 6 and 13; with TRN = 6 being common in three ‘CLas’ isolates. Overall, the study demonstrated that all examined five HLB isolates belonged to ‘CLas’ group. However, these isolates showed distinct sequence variability in three out of four genomic regions. The results provide a robust framework for understanding differences in pathogenicity among different HLB isolates as it is plausibly related to their genomic variation, and evolutionary history.
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The data that support the findings of this study are available from the corresponding author upon reasonable request.
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Acknowledgements
This research was funded by Indian Council of Agricultural Research- Consortia Research Platform (CRP) on Vaccines and Diagnostics, ICAR, Government of India, New Delhi. Authors thank Dr. Arun Kumar Dhar, University of Arizona, Tucson, Arizona 8572, USA for reviewing this manuscript. The authors declare there are no competing interests.
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DK, SB, and SK conceived and designed the experiments. SB, SK, AK and MG performed the experiments and analyzed the data. DK, SB and SK wrote and edited the manuscript. All authors read and approved the final manuscript.
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Kokane, S.B., Bhose, S., Kokane, A. et al. Molecular detection, identification, and sequence analysis of ‘Candidatus Liberibacter asiaticus’ associated with Huanglongbing disease of citrus in North India. 3 Biotech 10, 341 (2020). https://doi.org/10.1007/s13205-020-02334-x
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DOI: https://doi.org/10.1007/s13205-020-02334-x