Abstract
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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Acknowledgments
This work is based on the research supported in part by a number of grants from the National Research Foundation of South Africa (UID: 78566 (NRF RISP grant for the ABI3500)). The grant holders acknowledge that opinions, findings and conclusions or recommendations expressed in any publication generated by NRF supported research are that of the author(s), and that the NRF accepts no liability whatsoever in this regard.
The University of Pretoria and Potatoes South Africa are acknowledged for funding this work which formed part of an MSc degree at the University of Pretoria.
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Jordaan, E., van der Waals, J.E. Streptomyces species associated with common scab lesions of potatoes in South Africa. Eur J Plant Pathol 144, 631–643 (2016). https://doi.org/10.1007/s10658-015-0801-x
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DOI: https://doi.org/10.1007/s10658-015-0801-x