Genetic Diversity Among Alternaria solani Isolates from Potatoes in South Africa

Plant Disease
Jacquie E van der WaalsBernard Slippers

Abstract

Genetic diversity among isolates of Alternaria solani, the causal agent of early blight of potato, from various potato-growing regions in South Africa (SA), was determined using virulence assays, vegetative compatibility (VC) tests, and random amplified microsatellite (RAMS) primers. The virulence assays showed low virulence levels for the largest part of the population, but failed to otherwise characterize the population diversity. The VC tests revealed 19 VC groups (VCGs), indicating a relatively high level of diversity among the isolates. There was little correlation between geographic origin of isolates and VCGs. Analysis of RAMS profiles revealed 27% genetic diversity among 46 isolates. This value is relatively high for an asexually reproducing fungus, but is similar to values obtained previously by authors studying A. solani. Distance analysis of the RAMS profiles also provided no evidence for geographical clustering of isolates. VCG and RAMS profiles indicated that isolates are randomly spread across SA. This fact, together with the high diversity of A. solani in SA, indicates that the fungus has a high potential to adapt to resistant cultivars or fungicides. This information can aid in the breeding and deployment of A. ...Continue Reading

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Citations

Jul 30, 2017·Mycotoxin Research·Sebastian HickertHans-Ulrich Humpf
Sep 2, 2018·World Journal of Microbiology & Biotechnology·Garima Anand, Rupam Kapoor
Jan 24, 2014·PloS One·Cátia PintoAna C Gomes
Dec 11, 2014·Studies in Mycology·J H C WoudenbergP W Crous

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