In Search of Better Management of Potato Common Scab

Dees, Merete Wiken; Wanner, Leslie A.

doi:10.1007/s11540-012-9206-9

Cited by 121 publications

(71 citation statements)

References 137 publications

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“…Our results for soils inoculated with S. turgidiscabies and S. europaeiscabiei are yet consistent with previous work done with S. scabies (Lapwood et al 1970;Davis et al 1976;Loria 2001). The results also indicate a similar tolerance for elevated soil moisture levels for S. turgidiscabies and S. europaeiscabiei which is contradictory to previous assumptions of S. turgidiscabies being most tolerant (Dees & Wanner 2012).…”

Section: Discussioncontrasting

confidence: 99%

“…Among these are breeding for resistance, crop rotation, organic amendments, chemical treatments, biological control using antagonistic Streptomyces species, soil pHmanagement and reduction of oxygen content in the soil (reviewed in Dees & Wanner 2012). However, so far no methods alone seem effective and reliable for control of common scab in the field.…”

Section: Introductionmentioning

confidence: 99%

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High soil moisture reduces common scab caused byStreptomyces turgidiscabiesandStreptomyces europaeiscabieiin potato

Johansen

Dees

Hermansen

2014

Acta Agriculturae Scandinavica, Section B — Soil & Plant Sc

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Common scab (Streptomyces spp.) is a worldwide economic important disease of potato (Solanum tuberosum L.) because it degrades the appearance of the tubers and thereby decreases market value. For the newly reported Streptomyces turgidiscabies and Streptomyces europaeiscabiei in Norway, little is known about their specific environmental requirements, particularly their pathogenicity under varying moisture levels. Scab development after soil inoculation of S. turgidiscabies and S. europaeiscabiei in dry, normal and wet soils was studied in three pot experiments (2009-2011) under controlled climate conditions at natural light in Tromsø, Norway (69.7 N). With increased soil moisture, statistical significant reductions in scab severity were found in two out of three experiments for S. turgidiscabies (about 50% reduction). Similarly, scab caused by S. europaeiscabiei was reduced significantly in one experiment (65% reduction), and with a tendency of reduction in the other experiments. Scab development from seed-transmitted inoculum was investigated for both species. In one trial with four scab severity levels on mother tubers (0%, 10%, 30% and 50% of surface covered), we found that seed-transmitted disease development occurred for both species although few lesions were recorded. There were no significant differences in scab severity on progeny tubers, no matter the infection levels on seed tubers. These results indicate that seed tubers might play a minor role for transmitting common scab for S. turgidiscabies and S. europaeiscabiei, but further work is warranted. Related to growers practice, the results implicate that potato common scab caused by S. europaeiscabiei and S. turgidiscabies may be reduced by irrigation during the early stages of tuber formation, similar to currently recommended control measures for Streptomyces scabies.

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Section: Discussioncontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High soil moisture reduces common scab caused byStreptomyces turgidiscabiesandStreptomyces europaeiscabieiin potato

Johansen

Dees

Hermansen

2014

Acta Agriculturae Scandinavica, Section B — Soil & Plant Sc

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“…Different cultural practices in managing the disease have led to the selection of species capable of surviving under altered cropping conditions. Cultural practices remain the primary method for disease management of common scab (Dees and Wanner 2012).…”

Section: Introductionmentioning

confidence: 99%

Streptomyces species associated with common scab lesions of potatoes in South Africa

Jordaan

Waals

2015

Eur J Plant Pathol

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Streptomyces scabiei is largely accepted as the causal organism of common scab on potato in South Africa, and other Streptomyces species associated with common scab are not often considered. This study therefore aims to determine the diversity and prevalence of Streptomycetes associated with common scab on potatoes in South Africa.Isolates from 11 of the 16 potato producing regions in South Africa were characterized morphologically, physiologically and genetically. Most isolates resembled S. scabiei based on morphology and physiology. Most pathogenic isolates were S. scabiei and S. stelliscabiei, and no S. acidiscabies or S. turgidiscabies isolates were found. All three pathogenicity / virulence genes (txtAB, nec1, tomA) were found in South African isolates.Pathogenicity could not be linked to the presence of a single one or any combination of two of the three genes.These results represent the most comprehensive published survey of Streptomycetes isolated from common scab lesions on potatoes in South Africa.

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“…The ability to colonize living plant tissues and to cause plant diseases is a rare trait among the streptomycetes. Species that have this ability infect the underground portions of a wide variety of economically important crops, while above‐ground parts of the plant will generally remain healthy unless nutrient and water transport between the roots and the shoots is hindered by the infection (Dees and Wanner ). The most important host that is affected by plant pathogenic streptomycetes is potato ( Solanum tuberosum ), and as such most of the research to date has focused on the diseases affecting this crop.…”

Section: Introductionmentioning

confidence: 99%

“…The most important host that is affected by plant pathogenic streptomycetes is potato ( Solanum tuberosum ), and as such most of the research to date has focused on the diseases affecting this crop. However, those species causing scab disease of potato are neither tissue—nor host—specific and can infect potato as well as tap root crops such as carrot, beet, radish and parsnip under field conditions (Dees and Wanner ). Furthermore, such species can infect the seedlings of a variety of monocot and dicot plants under controlled conditions, leading to root and shoot stunting, cell hypertrophy and tissue necrosis (Leiner et al .…”

Section: Introductionmentioning

confidence: 99%

Phytotoxins produced by plant pathogenic Streptomyces species

2013

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Summary Streptomyces is a large genus consisting of soil‐dwelling, filamentous bacteria that are best known for their capability of producing a vast array of medically and agriculturally useful secondary metabolites. In addition, a small number of Streptomyces spp. are capable of colonizing and infecting the underground portions of living plants and causing economically important crop diseases such as potato common scab (CS). Research into the mechanisms of Streptomyces plant pathogenicity has led to the identification and characterization of several phytotoxic secondary metabolites that are known or suspected of contributing to diseases in various plants. The best characterized are the thaxtomin phytotoxins, which play a critical role in the development of CS, acid scab and soil rot of sweet potato. In addition, the best‐characterized CS‐causing pathogen, Streptomyces scabies, produces a molecule that is predicted to resemble the Pseudomonas syringae coronatine phytotoxin and which contributes to seedling disease symptom development. Other Streptomyces phytotoxic secondary metabolites that have been identified include concanamycins, FD‐891 and borrelidin. Furthermore, there is evidence that additional, unknown metabolites may participate in Streptomyces plant pathogenicity. Such revelations have implications for the rational development of better management procedures for controlling CS and other Streptomyces plant diseases.

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In Search of Better Management of Potato Common Scab

Cited by 121 publications

References 137 publications

High soil moisture reduces common scab caused byStreptomyces turgidiscabiesandStreptomyces europaeiscabieiin potato

High soil moisture reduces common scab caused byStreptomyces turgidiscabiesandStreptomyces europaeiscabieiin potato

Streptomyces species associated with common scab lesions of potatoes in South Africa

Phytotoxins produced by plant pathogenic Streptomyces species

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