Pathogenicity and Relative Abundance of <i>Dickeya</i> and <i>Pectobacterium</i> Species in Switzerland: An Epidemiological Dichotomy
<i>Pectobacterium</i> and <i>Dickeya</i> species are the causal agents of blackleg and soft rot diseases in potatoes. The main pathogenic species identified so far on potatoes are <i>Dickeya dianthicola</i>, <i>Dickeya solani</i>, <i>Pectobacteri...
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| Autores principales: | , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/42df5905b02746d1a26b747f628dd360 |
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| Sumario: | <i>Pectobacterium</i> and <i>Dickeya</i> species are the causal agents of blackleg and soft rot diseases in potatoes. The main pathogenic species identified so far on potatoes are <i>Dickeya dianthicola</i>, <i>Dickeya solani</i>, <i>Pectobacterium atrosepticum</i>, <i>Pectobacterium brasiliense</i>, <i>Pectobacterium carotovorum</i>, and <i>Pectobacterium parmentieri</i>. Ten years ago, the most prevalent Soft Rot Pectobacteriaceae in Europe were the <i>Dickeya</i> species, <i>P. atrosepticum</i> and <i>P. carotovorum</i>, with some variations among countries. Since then, a drastic increase in the abundance of <i>P. brasiliense</i> has been observed in most European countries. This shift is difficult to explain without comparing the pathogenicity of all <i>Dickeya</i> and <i>Pectobacterium</i> species. The pathogenicity of all the above-mentioned bacterial species was assessed in field trials and in vitro tuber slice trials in Switzerland. Two isolates of each species were inoculated by soaking tubers of cv. Desiree in a suspension of 10<sup>5</sup> CFU/mL, before planting in the field. For all trials, the <i>Dickeya</i> species were the most virulent ones, but long-term strain surveys performed in Switzerland indicate that <i>P. brasiliense</i> is currently the most frequent species detected. Our results show that the pathogenicity of the species is not the main factor explaining the high prevalence of <i>P. brasiliense</i> and <i>P. parmentieri</i> in the Swiss potato fields. |
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