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Molecular detection of a bacterial contaminant Bacillus pumilus in symptomless potato plant tissue cultures

  • Biotic and Abiotic Stress
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Abstract

An aberrant random amplified polymorphic DNA (RAPD) marker in genomic DNA of tissue culture plantlets was frequently observed during a comparison of DNA fingerprints derived from potato germplasm grown in tissue culture and the field. The RAPD marker was cloned, sequenced and determined to be of bacterial origin. A bacterial contaminant was isolated from the tissue culture plants and identified as a Bacillus pumilus. A set of sequence characterised amplified region (SCAR) primers were designed from the sequence of the cloned fragment and tested for the specific detection of B. pumilus. Polymerase chain reaction-restriction fragment length polymorphisms (PCR-RFLPs) were also used to generate B. pumilus profiles specific to our isolate in order to test and confirm the sequence homology of amplified markers generated from a range of DNA samples isolated from tissue culture plants and pure isolates of B. pumilus-like bacteria.

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Abbreviations

PCR-RFLP :

Polymerase chain reaction-restriction fragment length polymorphism

RAPD :

Random amplified polymorphic DNA

SCAR :

Sequence characterised amplified region polymorphism

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Acknowledgments

We thank Horticulture Australia Ltd, the Australian Potato Industry Council, AusIndustry and Department of Natural Resources and Environment for financial support. We also would like to thank IHD-Knoxfield colleagues Dr. Jo Luck and Dr. Brendan Rodoni for guidance with bacterial taxonomy, Dr. Nancy Jensen from Food Science Australia for technical advice and Dr. Ric Cother from NSW Agriculture for the supply of bacterial cultures.

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Correspondence to D. A. Isenegger.

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Communicated by P. Debergh

Nucleotide sequence 2-10500 is Genbank accession number AF396672. Nucleotide sequence for the almost-complete 16S rDNA is Genbank accession number AY112667.

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Isenegger, D.A., Taylor, P.W.J., Mullins, K. et al. Molecular detection of a bacterial contaminant Bacillus pumilus in symptomless potato plant tissue cultures. Plant Cell Rep 21, 814–820 (2003). https://doi.org/10.1007/s00299-003-0583-z

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  • DOI: https://doi.org/10.1007/s00299-003-0583-z

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