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

Citation

Balendres, MA and Tegg, RS and Wilson, CR, Resting spore dormancy and infectivity characteristics of the potato powdery scab pathogen Spongospora subterranea, Journal of Phytopathology, 165, (5) pp. 323-330. ISSN 0931-1785 (2017) [Refereed Article]


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DOI: doi:10.1111/jph.12565

Abstract

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 Details

Item Type:Refereed Article
Keywords:resting spores, spongospora subterranea, powdery scab, potato
Research Division:Agricultural and Veterinary Sciences
Research Group:Horticultural Production
Research Field:Horticultural Crop Protection (Pests, Diseases and Weeds)
Objective Division:Plant Production and Plant Primary Products
Objective Group:Horticultural Crops
Objective Field:Vegetables
Author:Balendres, MA (Mr Mark Balendres)
Author:Tegg, RS (Dr Robert Tegg)
Author:Wilson, CR (Associate Professor Calum Wilson)
ID Code:121619
Year Published:2017
Deposited By:Tasmanian Institute of Agriculture
Deposited On:2017-10-05
Last Modified:2017-10-09
Downloads:0

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