Variability and genetic diversity among Streptomyces scabiei infected potato cultivars with common scab from Egypt

Hussein, Mohamed M. A.; Hassan, Mona M.; Elfarash, Ameer

doi:10.21608/aasj.2019.203435

Cited by 2 publications

(2 citation statements)

References 32 publications

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“…In former research conducted in Elbeheira Governorate of Egypt, El-Sheikh et al (2012) identified 20 isolates of S. scabies with five that were highly virulent and 15 were moderately virulent based on scab index on potato mini tubers. Also, Hussein et al (2019) isolated 12 isolates of S. scabies that differed in their virulence on potato plants.…”

Section: Discussionmentioning

confidence: 99%

The Role of Thaxtomin A and Necrosis Protein in Virulence of Streptomyces scabies that Cause Potato Common Scab Disease

Eid

Bayoumi

El-Argawy

et al. 2022

Alexandria Science Exchange Journal

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Three isolates of Streptomyces scabies (St.1, St.2, and St.3) were examined for virulence on potato mini tubers, necrosis initiation on potato slices, inhibition of radish seedling length, production of thaxtomin A, and the presence of thaxtomin A (txtA) and nec1 genes. The three isolates, St.1, St.2, and St.3, were classified as highly virulent, moderately virulent, and weakly virulent, respectively. The St.1 isolate showed the highest scab severity index on potato mini tubers and necrosis on potato slices, while the St.3 had the lowest, and St.2 had intermediate values. The St.1 reduced radish seedling length by 82.35% and produced the highest toxin level (3.1 mg/ml), while the St.3 isolate reduced seedling length by 63.5% and produced the lowest level of toxin (1.18 mg/ml). The three isolates were positive for the presence of thaxtomin A (txtA) gene and produced a specific gene band at 500bp. However, St.1 and St.2 isolates were able to create a particular band at 700bp associated with the necrosis gene (nec1), while the isolate St.3 lacked this band. Based on the total protein profile analysis, the three S. scabies isolates clustered into two groups which diverged at a similarity index of 0.78. The St.2 and St.3 virulent isolates were located in the same group with 0.86 similarity, while the highly virulent isolate St.1 was located in a separate group. Current findings highlight the correlation between the presence of thaxtomin A and necrosis virulence factors and S. scabies pathogenicity.

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Section: Discussionmentioning

confidence: 99%

The Role of Thaxtomin A and Necrosis Protein in Virulence of Streptomyces scabies that Cause Potato Common Scab Disease

Eid

Bayoumi

El-Argawy

et al. 2022

Alexandria Science Exchange Journal

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“…The disease index was determined at 90 days after planting (Hosny et al 2016). Percentage of disease reduction was evaluated according to Hussein et al (2019). A total of sixteen plants were used from each treatment to determine the crop yield.…”

Section: In Vivo Studiesmentioning

confidence: 99%

Efficacy of Some Biocontrol Agents Against Streptomyces scabiei the Causative of Common Scab Disease in Potatoes

Hassan

Elfarash

Abo-Elyousr

et al. 2021

Egyptian Journal of Phytopathology

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The common scab disease caused by Streptomyces scabiei is an important disease infecting potato (Solanum tuberosum). In this study, twelve S. scabiei isolates were obtained from different governorates in Egypt. Efficacy of treatments with certain bioagents (Pseudomonas fluorescence, Bacillus subtilis, Trichoderma harzianum, Trichoderma viride) and chemicals (Capitan, Spectropan) to control common scab disease was evaluated. The results showed that treatment with Spectropan in infection time at a concentration of 2 mg/mL exhibited the highest disease reduction percentage, 61.13 and 65.49%, followed by Trichoderma viride by 52.63 and 69.8% for 2018 and 2019 seasons, respectively. Treatment of potato) Lady Rosetta cultivar) with Pseudomonas fluorescence and Bacillus subtilis resulted in a significant increase in the total phenols content and peroxidase and polyphenoloxidase activities during inoculation time and after inoculation time of Lady Rosetta cultivar with S. scabiei. However, the lowest activities of peroxidase and polyphenoloxidase were recorded due to treatment with Spectropan in inoculation time or after inoculation time. The obtained results revealed that the application of certain bioagents is an efficient method to control common scab in potatoes.

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Variability and genetic diversity among Streptomyces scabiei infected potato cultivars with common scab from Egypt

Cited by 2 publications

References 32 publications

The Role of Thaxtomin A and Necrosis Protein in Virulence of Streptomyces scabies that Cause Potato Common Scab Disease

The Role of Thaxtomin A and Necrosis Protein in Virulence of Streptomyces scabies that Cause Potato Common Scab Disease

Efficacy of Some Biocontrol Agents Against Streptomyces scabiei the Causative of Common Scab Disease in Potatoes

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