Effect of Calcium Carbonate on the Pathogenicity of Streptomyces scabies Causing Potato Scab and the Physiological Response of Potato Plants | ||||
| Alexandria Journal of Agricultural Sciences | ||||
| Articles in Press, Accepted Manuscript, Available Online from 12 May 2025 | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/alexja.2025.382473.1140 | ||||
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| Author | ||||
Said I. Behiry 
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| Abstract | ||||
| Potato scab disease, caused by Streptomyces scabies, is a significant bacterial disease affecting potato production worldwide. This study investigated the effect of calcium carbonate (CaCO₃) on S. scabies pathogenicity and the physiological response of potato plants under greenhouse conditions. Potato plants (cv. Diamond) were grown in soil inoculated with S. scabies strain E21 with and without CaCO₃ (5 g/kg soil). Plant growth parameters, disease incidence and severity, and biochemical responses were evaluated. Results showed that CaCO₃ amendment increased disease severity from 31.15% to 45.35% and disease incidence from 91.68% to 100%, though not statistically significant. CaCO₃ treatment significantly increased tuber weight (107.5 g vs. 88.5 g) and root dry weight (1.05 g vs. 0.45 g) but decreased shoot dry weight and root length. Biochemical analyses revealed that CaCO₃ amendment enhanced antioxidant enzyme activities (SOD and CAT) while reducing H₂O₂, MDA, and phenolic compound levels at both 30 and 60 days after planting. These findings suggest that while CaCO₃ may increase disease severity by creating favorable conditions for S. scabies, it simultaneously enhances plant defense mechanisms, particularly the enzymatic antioxidant system. This study provides insights into the complex interactions between soil amendments, pathogen virulence, and plant physiological responses, with implications for integrated management of potato scab disease. | ||||
| Keywords | ||||
| Potato scab; Streptomyces scabies; calcium carbonate (CaCO₃); disease severity; antioxidant enzymes | ||||
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