Susceptible and tolerant potato leaf-responses post challenge with Pectobacterium carotovorum subsp. brasiliense 1692
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.
KeywordsCell death Pectobacterium Potato Oxidative burst
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.
Compliance with ethical standards
1) This material has not been published in whole or in part elsewhere;
2) The manuscript is not currently being considered for publication in another journal;
3) All authors have been personally and actively involved in substantive work leading to the manuscript, and will hold themselves jointly and individually responsible for its content.
Conflict of interest
The authors declare that they have no conflict of interest.
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