Erwinia chrysanthemi
| Dickeya didantii | |
|---|---|
| Scientific classification | |
| Kingdom: | Bacteria |
| Phylum: | Proteobacteria |
| Class: | Gamma Proteobacteria |
| Order: | Enterobacteriales |
| Family: | Enterobacteriaceae |
| Genus: | Dickeya |
| Species: | D. dadantii |
| Binomial name | |
|
Dickeya dadantii Samson et al. 2005 |
|
Dickeya didantii is a gram-negative bacillus that belongs to the family Enterobacteriaceae. It was formerly known as Erwinia chrysanthemi but was reassigned as Dickeya dadantii in 2005. Members of this family are facultative anaerobes, able to ferment sugars to lactic acid, have nitrate reductase, but lack oxidases. Even though many clinical pathogens are part of the Enterobacteriaceae family, most members of this family are plant pathogens. D. dadantii is a motile, nonsporing, straight rod-shaped cell with rounded ends. Cells range in size from 0.8 to 3.2 μm by 0.5 to 0.8 μm and are surrounded by numerous flagella (peritrichous).
In the natural plant environment, D. dadantii causes plant maladies such as necrosis, blight and “soft rot,” which is a progressive tissue maceration.D. dadantii contains many pectinases that are able to macerate and break down the plant cell wall material. This exposed part of the plant releases nutrients that can facilitate bacterial growth. Commonly infected plants include potato tubers, bulbs of vegetables, and ornamental crops.
D. dadantii causes disease on several different ornamental and horticultural host plants throughout the world including: tropical, subtropical, and temperate climates. The host range of D. dadantii continues growing as new susceptible species are continuously being documented. It has also been found in soils, rivers and irrigation water. Host specificity is not yet fully understood. Originally pathovar groups were documented according to the hosts from which they were isolated. Today 50+ species have been identified and more are possible if another classification system based on biovars were to be used. Disease is most often reported on bananas, carnations, and chrysanthemums, but the list of host species is quite vast. Important host families and species economically affected include:
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