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Resting spore dormancy and infectivity characteristics of the potato powdery scab pathogen Spongospora subterranea

Balendres, MA, Tegg, RS ORCID: 0000-0001-7668-7927 and Wilson, CR ORCID: 0000-0001-5434-3816 2017 , 'Resting spore dormancy and infectivity characteristics of the potato powdery scab pathogen Spongospora subterranea' , Journal of Phytopathology, vol. 165, no. 5 , pp. 323-330 , doi: 10.1111/jph.12565.

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The soil-borne potato pathogen Spongospora subterranea persists in soil as sporosori, which are aggregates of resting spores. Resting spores may germinate in the presence of plant or environmental stimuli, but direct evidence for resting spore dormancy is limited. A soilless tomato bait plant bioassay and microscopic examination were used to examine features of S. subterranea resting spore dormancy and infectivity. Dried sporosori inocula prepared from tuber lesions and root galls were infective after both short- and long-term storage (1 week to 5 years for tuber lesions and 1 week to 1 year for root galls) with both young and mature root galls inocula showing infectivity. This demonstrated that a proportion of all S. subterranea resting spores regardless of maturity exhibit characteristics of stimuli-responsive dormancy, germinating under the stimulatory conditions of the bait host plant bioassay. However, evidence for constitutive dormancy within the resting spore population was also provided as incubation of sporosorus inoculum in a germination-stimulating environment did not fully exhaust germination potential even after 2.4 years. We conclude that S. subterranea sporosori contain both exogenous (stimuli-responsive) and constitutively dormant resting spores, which enables successful host infection by germination in response to plant stimuli and long-term persistence in the soil.

Item Type: Article
Authors/Creators:Balendres, MA and Tegg, RS and Wilson, CR
Keywords: resting spores, spongospora subterranea, powdery scab, potato
Journal or Publication Title: Journal of Phytopathology
Publisher: Blackwell Verlag Gmbh
ISSN: 0931-1785
DOI / ID Number: 10.1111/jph.12565
Copyright Information:

Copyright 2017 Blackwell Verlag GmbH

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