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Transcriptome analyses of Bactericera cockerelli adults in response to “Candidatus Liberibacter solanacearum” infection

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Abstract

The potato/tomato psyllid, Bactericera cockerelli (Šulc) is an economically important crop pest that not only causes damage through its feeding but also transmits the bacterium, “Candidatus Liberibacter solanacearum” (CLs), which causes zebra chip disease in potato. There is some information about the phenotypic effects of phytopathogenic bacteria on their insect vectors; however, there are no published reports of the molecular mechanisms underlying phytopathogenic bacteria–insect vector interaction. In order to investigate the effects of CLs infection on B. cockerelli, transcriptomic analyses of CLs-infected and uninfected adult psyllids that were reared on potato were performed. De novo assembly of cDNA sequences generated 136,518 and 109,983 contigs for infected and uninfected insect libraries with an average contig length of 514 bp. BlastX analysis against the NCBI-nr database revealed that 33.33 % had significant matches. Gene ontology data illustrated that the majority of the expressed psyllid genes are involved in metabolic process, biological regulation, binding and catalytic activity. The psyllid transcriptome had an abundance of genes such as vitellogenin, heat shock protein, ejaculatory bulb-specific protein, ferritin, and cytochrome oxidase. Notably absent in the psyllid transcriptome were innate immunity genes induced in response to Gram-negative bacteria (IMD pathway). Several functionally diverse contigs related to symbiotic bacteria including the primary endosymbiont Carsonella ruddii, Wolbachia, and CLs in the psyllid transcriptome were identified. A total of 247 contigs showed differential expression in response to CLs infection including immune and stress-related genes and vitellogenins. Expression analyses of selected psyllid genes were performed on psyllids that were exclusively reared on potato (host of the insects used for RNAseq) and psyllids exclusively reared on tomato (alternative host of psyllids). These genes showed similar expression patterns irrespective of the host plant on which the psyllids were reared, which suggests that host–plant association may not modulate expression of these genes. Our findings suggest that the impact of CLs on psyllid transcriptome was to a large extent on genes involved in metabolic processes and to a small extent on immune and stress response genes. This study is the first description of transcriptomic changes in an insect vector in response to infection with a naturally occurring bacterial plant pathogen. Data from this study provide new sequence and gene expression resources for functional genomics of potato psyllids.

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Acknowledgments

We thank Drs. Rush, Henne and Munyaneza for supplying psyllid stocks that were used to establish the colonies used in this study.

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  1. Punya Nachappa

    Present address: Department of Biology, Science Bldg, Indiana University-Purdue University, 2101 E. Coliseum Blvd, Fort Wayne, IN, 46805, USA

Authors and Affiliations

  1. Department of Entomology, 412 Heep Center, Texas A&M University, College Station, TX, 77843, USA

    Punya Nachappa & Cecilia Tamborindeguy

  2. Department of Horticultural Science, 202 HSF Building, Texas A&M University, College Station, TX, 77843, USA

    Julien Levy

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  1. Punya Nachappa
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  3. Cecilia Tamborindeguy
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Correspondence to Cecilia Tamborindeguy.

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Communicated by A. Hirsch.

P. Nachappa and J. Levy have contributed equally to this paper.

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Nachappa, P., Levy, J. & Tamborindeguy, C. Transcriptome analyses of Bactericera cockerelli adults in response to “Candidatus Liberibacter solanacearum” infection. Mol Genet Genomics 287, 803–817 (2012). https://doi.org/10.1007/s00438-012-0713-9

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  • DOI: https://doi.org/10.1007/s00438-012-0713-9

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