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Germinate to exterminate: chemical stimulation of Spongospora subterranea resting spore germination and its potential to diminish soil inoculum

Balendres, MA, Clark, TJ, Tegg, RS ORCID: 0000-0001-7668-7927 and Wilson, CR ORCID: 0000-0001-5434-3816 2018 , 'Germinate to exterminate: chemical stimulation of Spongospora subterranea resting spore germination and its potential to diminish soil inoculum' , Plant Pathology, vol. 67 , pp. 902-908 , doi: 10.1111/ppa.12795.

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Abstract

Hoagland’s solution (HS), a defined nutrient supplement for plants, has been previously reported to stimulate zoospore release from resting spores of the potato pathogen Spongospora subterranea f. sp. subterranea. This study obtained direct empirical evidence for an increase in zoospore release with HS treatment, and identified Fe-EDTA as the stimulant component of HS. Stimulation of resting spores by HS and Fe-EDTA resulted in greater and earlier zoospore release compared to a distilled water control, and in the presence of a susceptible tomato host plant resulted in enhanced root infection. Given the labile nature of S. subterranea zoospores, it was postulated that stimulation of premature release of zoospores from the dormant resting spores in absence of susceptible hosts could reduce soil inoculum levels. In two glasshouse trials in the absence of host plants, both Fe-EDTA and HS soil treatments reduced S. subterranea soil inoculum levels, providing proof of concept for the ‘germinate to exterminate’ approach to inoculum management.

Item Type: Article
Authors/Creators:Balendres, MA and Clark, TJ and Tegg, RS and Wilson, CR
Keywords: resting spore germination, inoculum control, spongospora, powdery scab, potato
Journal or Publication Title: Plant Pathology
Publisher: Blackwell Publishing Ltd
ISSN: 0032-0862
DOI / ID Number: 10.1111/ppa.12795
Copyright Information:

Copyright 2017 British Society for Plant Pathology

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