Eight years of annual monitoring of DNA of soil-borne potato pathogens in farm soils in south eastern Australia

Sparrow, LA; Rettke, M. A.; Corkrey, Ross

doi:10.1007/s13313-014-0340-5

Cited by 20 publications

(8 citation statements)

References 32 publications

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“…Furthermore, effects of S. subterranea on productivity (tuber yields) of different cultivars have yet to be examined in detail in field trials. However, root galling in commercial potato crops is common in New Zealand and elsewhere, indicating that the pathogen is widespread in cropping soils (see also Sparrow et al ., ), providing potential for the pathogen to harm crop yields.…”

Section: Discussionmentioning

confidence: 99%

Root infection of potato by Spongospora subterranea: knowledge review and evidence for decreased plant productivity

et al. 2015

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Information is reviewed on root infection of potato by the plasmodiophorid Spongospora subterranea f. sp. subterranea. This pathogen has long been recognized as the cause of root galls (hyperplasia) and the economically important disease powdery scab on tubers (modified stolons). The significance for plant productivity of the zoosporangium stages of the pathogen in potato roots has only recently begun to be documented. Two experiments are described that assessed effects of S. subterranea root infection on potato plant root function and productivity. A greenhouse experiment measured root function and plant parameters for eight potato cultivars with markedly different susceptibilities to tuber powdery scab. Water uptake and plant growth were reduced by S. subterranea inoculation in all eight cultivars. The magnitudes of these negative effects, and intensities of root hyperplasia, differed among the cultivars, but were not related to respective susceptibilities to tuber powdery scab. A field trial assessed root function and plant productivity for a cultivar (Iwa) that is very susceptible to Spongospora tuber and root diseases. Soil water content beneath uninoculated plants was consistently less than for inoculated plants, indicating that inoculation reduced water uptake (root function). Inoculation reduced shoot and root dry weights, and reduced weight of tubers per plant by 42%. Spongospora subterranea causes three diseases of potato: root membrane dysfunction, root hyperplasia and tuber powdery scab. The root diseases caused by the pathogen are likely to be important both for powdery scab management and for deleterious effects on potato crop yields.

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Section: Discussionmentioning

confidence: 99%

Root infection of potato by Spongospora subterranea: knowledge review and evidence for decreased plant productivity

et al. 2015

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“…In contrast, a prior study that compared soil S. subterranea amounts in field sites that had grown either opium poppy or pasture prior to potato production suggested pathogen amounts were, on average, lower in fields that had grown poppy, but that this did not result in less disease in the subsequent potato crops (Sparrow & Wilson, ). Also, in a multiyear rotation trial conducted in NW Tasmania, there was no significant effect of opium poppy crops on S. subterranea soil inoculum, but opium poppy crops did increase inoculum of Rhizoctonia solani AG2.1 (Sparrow et al., ). In the present study, inoculated opium poppy plants grown in the glasshouse did not show root gall development associated with zoosporangium infection.…”

Section: Discussionmentioning

confidence: 99%

“…North West Tasmania is one of the most important potato production regions in Australia. Quantitative soil testing for the abundance of S. subterranea in this region has revealed many fields with high soil inoculum levels (Sparrow & Wilson, ; Sparrow, Rettke, & Corkrey, ). This is despite typical rotational practices of 5–8 years between potato crops, lengthy by national and global standards.…”

Section: Introductionmentioning

confidence: 99%

“…This is despite typical rotational practices of 5–8 years between potato crops, lengthy by national and global standards. Analyses of S. subterreanea soil inoculum in NW Tasmania throughout a typical cropping rotation found that following potato, inoculum amounts in infested soils were substantially raised, and then gradually declined in the period between potato crops (Sparrow et al., ).…”

Section: Introductionmentioning

confidence: 99%

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Susceptibility of opium poppy and pyrethrum to root infection by Spongospora subterranea

Clark

Rockliff

Tegg

et al. 2018

Journal of Phytopathology

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Spongospora subterranea, which causes powdery scab of potato, infects a diverse range of plant species. Crop rotation as a powdery scab management tool will be compromised if pathogen hosts exist between potato crops. Opium poppy (Papaver somniferum) and pyrethrum (Tanacetum cinerariifolium) are important crops within intensive vegetable production rotations in NW Tasmania. Measurements of S. subterranea soil inoculum within a commercial field showed pathogen amounts were substantially elevated following an opium poppy crop, which suggested host status. In glasshouse testing, opium poppy and pyrethrum were confirmed as hosts of S. subterranea, with opium poppy the more susceptible of the two. Both species were less susceptible than tomato, a known host. Observations of early growth suggested inoculation impacts on all three plant species, although at 16 (tomato and opium poppy) or 26 (pyrethrum) weeks postinoculation, only tomato had significantly reduced shoot and root development. The role of rotation crops in inoculum persistence and the possible role of S. subterranea as a minor pathogen of nonpotato crops are discussed.

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“…Furthermore, several authors have suggested that resting spores can survive for more than 10 years in the soil following observations from field sites with extended periods between potato crops (Falloon ; Merz ; Sparrow et al. ). However, it remains unclear whether resting spore dormancy was due to constitutive or exogenous mechanisms.…”

Section: Discussionmentioning

confidence: 99%

Resting Spore Dormancy and Infectivity Characteristics of the Potato Powdery Scab Pathogen Spongospora subterranea

Balendres

Tegg

Wilson

2017

Journal of Phytopathology

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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.

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Eight years of annual monitoring of DNA of soil-borne potato pathogens in farm soils in south eastern Australia

Cited by 20 publications

References 32 publications

Root infection of potato by Spongospora subterranea: knowledge review and evidence for decreased plant productivity

Root infection of potato by Spongospora subterranea: knowledge review and evidence for decreased plant productivity

Susceptibility of opium poppy and pyrethrum to root infection by Spongospora subterranea

Resting Spore Dormancy and Infectivity Characteristics of the Potato Powdery Scab Pathogen Spongospora subterranea

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