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Streptomyces is the largest genus of Actinobacteria and the type genus of the family Streptomycetaceae. Over 500 species of Streptomyces bacteria have been described. As with the other Actinobacteria, streptomycetes are gram-positive, and have genomes with high GC content. Found predominantly in soil and decaying vegetation, most streptomycetes produce spores, and are noted for their distinct "earthy" odor that results from production of a volatile metabolite, geosmin.
Powdery scab is a disease of potato tubers. It is caused by the cercozoan Spongospora subterranea f. sp. subterranea and is widespread in potato growing countries. Symptoms of powdery scab include small lesions in the early stages of the disease, progressing to raised pustules containing a powdery mass. These can eventually rupture within the tuber periderm. The powdery pustules contain resting spores that release anisokont zoospores to infect the root hairs of potatoes or tomatoes. Powdery scab is a cosmetic defect on tubers, which can result in the rejection of these potatoes. Potatoes which have been infected can be peeled to remove the infected skin and the remaining inside of the potato can be cooked and eaten.
Colletotrichum kahawae is a fungal plant pathogen that causes coffee berry disease (CBD) on Coffea arabica crops. The pathogen is an ascomycete that reproduces asexually. The asexual spores (conidia) are stored within acervuli. This disease is considered to be one of the major factors hampering C.arabica production in the African continent, which represents the current geographic range of the fungus. Coffee berry disease causes dark necrosis in spots and causes the green berries of the coffee to drop prematurely. High humidity, relatively warm temperatures, and high altitude are ideal for disease formation. Given the severity of the disease and the lack of effective control measures, there is great concern that the fungus may spread to other coffee producing continents, such as South America, which could have catastrophic consequences.
Streptomyces scabies or Streptomyces scabiei is a streptomycete bacterium species found in soils around the world. Unlike most of the 500 or so Streptomyces species it is a plant pathogen causing corky lesions to form on tuber and root crops as well as decreasing the growth of seedlings. Along with other closely related species it causes the potato disease common scab, which is an economically important disease in many potato growing areas. It was first described in 1892, being classified as a fungus, before being renamed in 1914 and again in 1948. Several other species of Streptomyces cause similar diseases to S. scabies but other, more closely related species, do not.
Common scab is a plant disease of root and tuber crops caused by a small number of Streptomyces species, specifically S. scabies, S. acidiscabies, S. turgidiscabies and others. Common scab mainly affects potato, but can also cause disease on radish, parsnip, beet, and carrot. This plant disease is found wherever these vegetables are grown.
Bintje is a middle-early ripening potato variety bred in the Netherlands by the Frisian schoolmaster K.L. de Vries in 1904 from and marketed for the first time in 1910. The name of the potato, a diminutive of Benedict, was borrowed from one of his former students.
Streptomyces europaeiscabiei or is a streptomycete bacterium species that is associated with common scab in potatoes. Its type strain is CFBP 4497T.
Streptomyces stelliscabiei or is a streptomycete bacterium species that is associated with common scab in potatoes. Its type strain is CFBP 4521T.
Streptomyces reticuliscabiei is a streptomycete bacterium species that is associated with netted scab in potatoes. Its type strain is CFBP 4517T. It is considered to be part of a cluster together with S. turgidiscabies, however they cause different diseases, the former involved in common scab.
Streptomyces acidiscabies is a streptomycete bacterium species, causing a scab disease of potatoes. Its type strain is RL-110.
Streptomyces turgidiscabies is a streptomycete bacterium species, causing scab in potatoes. It has flexuous spore, the latter which are cylindrical and smooth. The type strain is SY9113T. It is almost identical to Streptomyces reticuliscabiei, however they are considered distinct species given the diseases they cause are different.
Streptomyces luridiscabiei is a streptomycete bacterium species known to cause potato common scab disease in Korea. Its type strain is S63T. It has yellow-white, smooth, cylindrical spores that are borne in monoverticillus flexuous spore-chains.
Streptomyces puniciscabiei is a streptomycete bacterium species known to cause potato common scab disease in Korea. Its type strain is S77T. It has purple-red, spiny spores that are borne in simple rectus flexuous spore-chains.
Streptomyces ipomoeae is a bacterium species from the genus of Streptomyces which has beein isolated from rot from potatoes. Streptomyces ipomoeae produces thaxtomin C and ipomycin. Streptomyces ipomoeae can cause soft rot disease on sweet potatoes.
Streptomyces lydicus is a bacterium species from the genus of Streptomyces which has been isolated from soil in the United States. Streptomyces lydicus produces actithiazic acid, natamycin, lydimycin, streptolydigin, and 1-deoxygalactonojirimycin. Streptomyces lydicus can be used as an agent against fungal plant pathogens like Fusarium, Pythium, Phytophthora, Rhizoctonia and Verticillum.
Streptomyces melanosporofaciens is a bacterium species from the genus of Streptomyces which has been isolated from soil in Italy. Streptomyces melanosporofaciens produces elaiophylin, cyclooctatin, geldanamycin, chilaphylin and melanosporin. A mutant of Streptomyces melanosporofaciens has the ability to protect potatoes from common scab.
Streptomyces niveiciscabiei is a bacterium species from the genus of Streptomyces which has been isolated from common scab from potatoes in Korea. Streptomyces niveiciscabiei can cause common scab in potatoes.
Streptomyces violaceusniger is a bacterium species from the genus of Streptomyces. Streptomyces violaceusniger has antifungal activity. Streptomyces violaceusniger produces isoafricanol and spirofungin.
Chryseobacterium piscicola is a Gram-negative, rod-shaped and non-motil bacteria from the genus of Chryseobacterium which has been isolated from the salmon Salmo salar from the Los Lagos Region in Chile.
Xenorhabdus budapestensis is a bacterium from the genus of Xenorhabdus which has been isolated from the nematode Steinernema bicornutum in Subotica in Serbia. Xenorhabdus budapestensis produces bicornutin A2.
References
- ↑ Park, D. H. (2003). "Streptomyces luridiscabiei sp. nov., Streptomyces puniciscabiei sp. nov. and Streptomyces niveiscabiei sp. nov., which cause potato common scab disease in Korea". International Journal of Systematic and Evolutionary Microbiology. 53 (6): 2049–2054. doi:10.1099/ijs.0.02629-0. ISSN 1466-5026. PMID 14657144.
