Spongospora subterranea f. sp. subterranea Affects Plant Susceptibility to Subsequent Pathogen Infections Under Controlled-Environment Conditions

Author:

Ozturk Ibrahim Kutay12ORCID,Buchholz Elizabeth13,Bentley Ally1,Halterman Dennis14,Rioux Renee15

Affiliation:

1. Department of Plant Pathology, University of Wisconsin–Madison, Madison, WI 53706

2. Cooperative Extension, University of Maine, Presque Isle, ME 04769

3. Department of Plant and Environmental Sciences, University of Hawaiʻi at Mānoa, Honolulu, HI 96822

4. Vegetable Crops Research Unit, Agricultural Research Service, United States Department of Agriculture, Madison, WI 53706

5. BASF, Research Triangle Park, NC 27709

Abstract

Spongospora subterranea f. sp. subterranea (Sss) is a soilborne potato pathogen responsible for causing powdery scab on tubers and galls on roots, reducing root water uptake through colonizing root hairs, and vectoring of Potato mop-top virus (PMTV). However, effects of Sss on overall plant susceptibilities against subsequent infections of potato pathogens above ground have not been previously reported. This study aimed to investigate the effects of Sss on root and tuber disease expression, yield, and susceptibilities to subsequent late blight and white mold infections across six potato varieties. Sss-infected Silverton plants had 28.3% less total tuber yield and 29% fewer tubers compared to noninfected Silverton plants. We did not find a correlation across the varieties between root colonization and root gall formation. Sss-infected Silverton plants were more susceptible to hemibiotrophic late blight and less susceptible to necrotrophic white mold. Sss infection also increased susceptibilities of Goldrush and Atlantic plants to white mold. We also evaluated prevalence of asymptomatic Sss infections across the six varieties. Between 50 and 92% of the asymptomatic tubers tested positive for Sss DNA, depending on the variety. Further research is required to understand the possibility and extent of these asymptomatic infections to the spread of Sss in the field. These findings highlight the complexity of Sss-host interactions and give precedence that the lack of disease expression does not necessarily indicate resistance of a variety to Sss.

Publisher

Scientific Societies

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