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Simultaneous Detection of Brown Rot- and Soft Rot-Causing Bacterial Pathogens from Potato Tubers Through Multiplex PCR

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Abstract

Ralstonia solanacearum (Smith) Yabuuchi et al. and Erwinia carotovora subsp. carotovora (Jones) Bergey et al. (Pectobacterium carotovorum subsp. carotovorum) are the two major bacterial pathogens of potato causing brown rot (wilt) and soft rot diseases, respectively, in the field and during storage. Reliable and early detection of these pathogens are keys to avoid occurrence of these diseases in potato crops and reduce yield loss. In the present study, multiplex polymerase chain reaction (PCR) protocol was developed for simultaneous detection of R. solanacearum and E. carotovora subsp. carotovora from potato tubers. A set of oligos targeting the pectatelyase (pel) gene of E. carotovora subsp. carotovora and the universal primers based on 16S r RNA gene of R. solanacearum were used. The standardized multiplex PCR protocol could detect R. solanacearum and E. carotovora subsp. carotovora up to 0.01 and 1.0 ng of genomic DNA, respectively. The protocol was further validated on 96 stored potato tuber samples, collected from different potato-growing states of India, viz. Uttarakhand, Odisha, Meghalaya and Delhi. 53.1 % tuber samples were positive for R. solanacearum, and 15.1 % of samples were positive for E. carotovora subsp. carotovora, and both the pathogens were positive in 26.0 % samples when BIO-PCR was used. This method offers sensitive, specific, reliable and fast detection of two major bacterial pathogens from potato tubers simultaneously, particularly pathogen-free seed certification in large scale.

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Acknowledgments

The authors are thankful to ICAR for financial assistance. The authors are also thankful to the Head, the Division of Plant Pathology, IARI, New Delhi for providing research facilities, planning and encouragement to execute the research work.

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  1. Division of Plant Pathology, ICAR- Indian Agricultural Research Institute, New Delhi, 110012, India

    R. K. Ranjan, Dinesh Singh & V. K. Baranwal

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  1. R. K. Ranjan
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  2. Dinesh Singh
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  3. V. K. Baranwal
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Correspondence to Dinesh Singh.

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Ranjan, R.K., Singh, D. & Baranwal, V.K. Simultaneous Detection of Brown Rot- and Soft Rot-Causing Bacterial Pathogens from Potato Tubers Through Multiplex PCR. Curr Microbiol 73, 652–659 (2016). https://doi.org/10.1007/s00284-016-1110-0

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  • DOI: https://doi.org/10.1007/s00284-016-1110-0

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