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New Insights into the Genetic Diversity of the Bacterial Plant Pathogen ‘Candidatus Liberibacter solanacearum’ as Revealed by a New Multilocus Sequence Analysis Scheme

Ahmed Hajri, Pascaline Cousseau-Suhard, Pascal Gentit, Marianne Loiseau
doi: https://doi.org/10.1101/623405
Ahmed Hajri
Plant Health Laboratory, ANSES, Angers, France
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Pascaline Cousseau-Suhard
Plant Health Laboratory, ANSES, Angers, France
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Pascal Gentit
Plant Health Laboratory, ANSES, Angers, France
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Marianne Loiseau
Plant Health Laboratory, ANSES, Angers, France
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  • For correspondence: marianne.loiseau@anses.fr
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Abstract

‘Candidatus Liberibacter solanacearum’ (Lso) has emerged as a serious threat on solanaceous and apiaceous crops worldwide. Five Lso haplotypes (LsoA, LsoB, LsoC, LsoD and LsoE) have been identified so far. To decipher genetic relationships between Lso strains, a MLSA study of seven housekeeping genes (acnA, atpD, ftsZ, glnA, glyA, gnd and groEL) was performed on a representative bacterial collection of 49 Lso strains. In all, 5415 bp spanning the seven loci were obtained from each of the 49 strains of our bacterial collection. Analysis of sequence data was consistent with a clonal population structure with no evidence of recombination. Phylogenies reconstructed from individual genes, and with concatenated data, were globally congruent with each other. In addition to the five highly supported and distinct genetic clusters, which correspond to the five established haplotypes, our phylogenetic data revealed the presence of a sixth haplotype, designated ‘LsoG’. This new haplotype is currently represented by two strains from France which had distinct sequences in four out of the seven tested housekeeping genes. Altogether, the data presented here provide new information regarding the genetic structure of Lso and the evolutionary history of the haplotypes defined within this bacterial species.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted April 30, 2019.
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New Insights into the Genetic Diversity of the Bacterial Plant Pathogen ‘Candidatus Liberibacter solanacearum’ as Revealed by a New Multilocus Sequence Analysis Scheme
Ahmed Hajri, Pascaline Cousseau-Suhard, Pascal Gentit, Marianne Loiseau
bioRxiv 623405; doi: https://doi.org/10.1101/623405
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New Insights into the Genetic Diversity of the Bacterial Plant Pathogen ‘Candidatus Liberibacter solanacearum’ as Revealed by a New Multilocus Sequence Analysis Scheme
Ahmed Hajri, Pascaline Cousseau-Suhard, Pascal Gentit, Marianne Loiseau
bioRxiv 623405; doi: https://doi.org/10.1101/623405

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