Isolation, identification, and characterization of Streptomyces species from common scab lesions

Abstract

Streptomyces scabiei is largely accepted as the causal organism of common scab on potato in Debiganj, Rangpur 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 a common scab on potatoes in Debiganj, Rangpur. Isolates from 11 of the 16 potato-producing regions in Debiganj, Rangpur were characterized morphologically, physiologically, and genetically. Most isolates resembled S. scabiei based on morphology and physiology. Most pathogenic isolates were S. acidiscabies or S. turgidiscabies, and no S. scabiei and S. stelliscabiei isolates were found. All three pathogenicity/ virulencepathogenicity/ virulence genes (txtAB, nec1, tomA) were found in Debiganj, Rangpur 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 Debiganj, Rangpur.