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Susceptible and tolerant potato leaf-responses post challenge with Pectobacterium carotovorum subsp. brasiliense 1692

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Abstract

Leaf responses of a susceptible potato cultivar (S. tuberosum cv. Valor) were compared to those of a tolerant potato cultivar (S. tuberosum cv. BP1) following challenge by Pectobacterium carotovorum subsp. brasiliense 1692 (Pcb 1692). Leaves of the susceptible cultivar showed excessive maceration and water soaking symptoms as well as increased proliferation of the bacteria. In leaves of the tolerant cultivar, bacteria appeared to be restricted to the point of inoculation,subsequently; there was very little multiplication of bacterial cells. Furthermore we demonstrated that disease is associated with the extensive spread of cell death in S. tuberosum cv. Valor while in S. tuberosum cv. BP1 cell death was observed to be associated with lack of disease development. Another response associated with challenge by Pcb 1692 in the susceptible and tolerant potato cultivar leaf tissue was the oxidative burst. Generally, the accumulation of hydrogen peroxide and superoxide in leaf-tissue appeared to correlate with tolerance levels.

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Acknowledgements

This research study was funded by the National Research Foundation (NRF), South Africa through Competitive Funding for Rated Researchers (CFRR) 98993, Research Technology and Transfer Fund (RTF) 98654. GM was funded by the NRF Grant Holder Linked Bursary.

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Authors and Affiliations

  1. Department of Microbiology and Plant Pathology, University of Pretoria, Lynnwood Road, Pretoria, South Africa

    G.K.E Mosina & Lucy Novungayo Moleleki

  2. Forestry, Agriculture and Biotechnology Institute, University of Pretoria, Lynnwood Road, Pretoria, South Africa

    G.K.E Mosina & Lucy Novungayo Moleleki

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  1. G.K.E Mosina
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  2. Lucy Novungayo Moleleki
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Correspondence to Lucy Novungayo Moleleki.

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Mosina, G., Moleleki, L.N. Susceptible and tolerant potato leaf-responses post challenge with Pectobacterium carotovorum subsp. brasiliense 1692. Eur J Plant Pathol 152, 525–530 (2018). https://doi.org/10.1007/s10658-018-1472-1

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