Assessment of a glasshouse test for measuring the resistance of potato cultivars to common scab

1985 ◽  
Vol 28 (3) ◽  
pp. 379-387 ◽  
Author(s):  
P. D. S. Caligari ◽  
R. L. Wastie
Keyword(s):  
Common Scab ◽  
Potato Cultivars

Screening potato cultivars for common scab of potato in a naturally infested field

2001 ◽  
Vol 44 (1) ◽  
pp. 19-24 ◽  
Author(s):  
K. K. Mishra ◽  
J. S. Srivastava
Keyword(s):  
Common Scab ◽  
Potato Cultivars ◽  
Infested Field

scholarly journals On Selection of Resistant Potato Cultivars to Common Scab(S. scabies)

2004 ◽  
Vol 10 (2) ◽  
pp. 135-137 ◽  
Author(s):  
Soon-Yeong Hong ◽  
Yong-Kil Kang ◽  
Young-Il Hahm
Keyword(s):  
Common Scab ◽  
Potato Cultivars ◽  
Selection Of

scholarly journals Investigation of Streptomyces scabies Causing Potato Scab by Various Detection Techniques, Its Pathogenicity and Determination of Host-Disease Resistance in Potato Germplasm

Pathogens ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 760
Author(s):  
Sohaib Ismail ◽  
Bo Jiang ◽  
Zohreh Nasimi ◽  
M. Inam-ul-Haq ◽  
Naoki Yamamoto ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Common Scab ◽  
Streptomyces Scabies ◽  
Potato Cultivars ◽  
Potato Tubers ◽  
Streptomyces Species ◽  
Detection Techniques ◽  
Streptomyces Spp ◽  
Geographical Regions

Streptomyces scabies is a Gram-positive bacterial pathogen that causes common scab disease to several crops, particularly in the potato. It is a soil borne pathogen, a very devastating scab pathogen and difficult to manage in the field. Streptomyces has several species that cause common scab such as S. scabiei, S. acidiscabies, S. europaeiscabiei, S. luridiscabiei, S. niveiscabiei, S. puniciscabiei, S. reticuliscabiei, S. stelliscabiei, S. turgidiscabies, S. ipomoeae. Common scab disease harmfully affects potato economic and market value due to the presence of black spots on the tuber. Owing to its genetic diversity and pathogenicity, the determination of pathogen presence in potato fields is still challenging. In this study, S. scabies genetic diversity was measured by surveying five potato-growing areas of Pakistan during the growing season 2019. A total of 50 Streptomyces isolates, including S. scabies, S. acidiscabies, S. griseoflavus were isolated and identified based on morphologic, biochemical and molecular analysis. Virulent confirmation assays confirmed ten virulent strains of Streptomyces spp. On the potato cultivars Cardinal and Santee. Among the Streptomyces species, S. scabies showed the highest scab index, followed by S. acidiscabies and S. griseoflavus by exhibiting the scab-like lesions on potato tubers. Ten potato cultivars were screened against these virulent isolates of Streptomyces. The Faisalabad white variety showed the highest scab index followed By Cardinal, Tourag, Kuroda, Santee, Lady Rosetta, Asterix, Diamant, Faisalabad red and Sadaf. Moreover, genetic diversity and pathogenicity of Streptomyces spp. on potato tubers were also likely diverse in different geographical regions and also potato cultivars. This study represents a contribution to understanding the local interaction between potatoes and Streptomyces spp. in Pakistan. It will aid in supporting a solution for the management of this pathogen around the world.

Responses of potato cultivars to the common scab pathogens, Streptomyces scabies and S. turgidiscabies

2005 ◽  
Vol 146 (3) ◽  
pp. 395-403 ◽  
Author(s):  
L H HILTUNEN ◽  
A WECKMAN ◽  
A YLHAINEN ◽  
H RITA ◽  
E RICHTER ◽  
...  
Keyword(s):  
Common Scab ◽  
Streptomyces Scabies ◽  
Potato Cultivars ◽  
The Common

scholarly journals Fissure Scab, a New Symptom Associated with Potato Common Scab Caused by a Streptomyces sp. in South Africa

Plant Disease ◽  
2012 ◽  
Vol 96 (8) ◽  
pp. 1223-1223 ◽  
Author(s):  
R. Gouws ◽  
A. McLeod
Keyword(s):  
South Africa ◽  
16S Rrna ◽  
Common Scab ◽  
Potato Cultivars ◽  
Tuber Initiation ◽  
Species Identity ◽  
Streptomyces Sp ◽  
Streptomyces Spp ◽  
Reference Isolate ◽  
Initial Symptoms

Common scab caused by Streptomyces spp. is one of the major factors limiting successful potato (Solanum tuberosum) production in South Africa. Most potato cultivars are susceptible to the disease and huge losses are incurred due to a reduction in cosmetic value. Common scab symptoms that have been reported worldwide are variable, with circular, raised, tan-to-brown, corky lesions being the most common symptoms. However, a distinct atypical symptom was observed in isolated production regions (Western Free State and Mpumalanga) in South Africa since early 2010. Deep longitudinal fissures (3 to 12 mm) containing scab-like lesions were observed on the surface area of tubers from several potato cultivars (Mondial, BP1, and Buffelspoort). Lesions on Mondial were interesting since this cultivar, but not the susceptible BP1 and Buffelspoort cultivars, is tolerant to typical common scab in South Africa. Isolations were made from tuber lesions obtained from the two production regions and were plated onto yeast malt extract medium. Several pure culture strains were obtained that were positively identified as Streptomyces spp. based on morphology. Species identity of four strains was investigated using PCR primers targeting the 16S rRNA region of known species (3), which showed that the strains did not belong to any of the known pathogenic reference strains (S. scabiei, S. europascabiei, S. turgidiscabies, S. acidiscabies). Species identity of the strains was further investigated through sequencing of the 16S rRNA region (1.2 kb). The four strains had 100% sequence similarity (GenBank Accession. No. JQ241439) to each other and to 15 GenBank sequences that included several unknown Streptomyces spp., S. vinaceus, S. malachiticus, S. werraensis, S. cyaneus (the only published sequenced), and S. pseudogriseolus. The sequence of the isolates had only 95.5% identity to the most prevalent common scab pathogen, S. scabiei (GI154707840, [3]). The pathogenicity of the four strains, along with an S. scabiei reference isolate, was investigated using BP1 potato tubers and the double pot methodology (1). Fifteen-centimeter pots containing silica sand were each planted with one potato tuber and placed on top of a rectangular planting box (15 × 1.5 × 0.4 m) filled with native Hutton soil. The 15-cm pots were irrigated until the roots grew into the Hutton soil. Subsequently, irrigation was only applied to the Hutton soil, thus creating dry conditions in the tuber development area (15-cm pot), which is conducive for common scab development. The potato plants were inoculated with 10- to 14-day-old Streptomyces strains during the tuber initiation stage at a concentration of 1 × 106 spores/ml of sterile water, 10 ml per plant, and six replicates per strain. Ten weeks after inoculation, each of the four strains caused cracking and scabbing, similar to initial symptoms observed, on more than 90% of the tubers. The S. scabiei reference isolate caused typical circular, raised, brown, corky common scab lesions. Streptomyces was reisolated from the lesions, fulfilling Koch's postulates. To our knowledge, these results indicate that a previously unreported Streptomyces sp. is the causal agent of a new lesion type, fissure scab, on potato in South Africa that may lead to serious losses to the local potato industry. References: (1) L. Marais and R. Vorster. Potato Res. 31:401, 1988. (2) D. J. Theron. Page 1 in: Guide to Potato Production in South Africa, 2003. (3) L. Wanner. Phytopathology 96:1363, 2006.

Accumulation of mineral elements in tuber periderm of potato cultivars differing in susceptibility to common scab

2000 ◽  
Vol 43 (2) ◽  
pp. 107-114 ◽  
Author(s):  
V. Krištůfek ◽  
J. Diviš ◽  
I. Dostálková ◽  
J. Kalčík
Keyword(s):  
Common Scab ◽  
Mineral Elements ◽  
Potato Cultivars ◽  
Tuber Periderm
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