Do colonization by dark septate endophytes and elevated temperature affect pathogenicity of oomycetes?

FEMS Microbiology Ecology
Christoph Tellenbach, Thomas N Sieber

Abstract

Phialocephala subalpina is one of the most frequent dark septate root endophytes in tree roots but its function in forest ecosystems is largely unknown. A full-factorial infection experiment was performed, using six P. subalpina isolates, two pathogenic oomycetes (Phytophthora plurivora [syn. Phytophthora citricola s.l.] and Elongisporangium undulatum [syn. Pythium undulatum]) and two temperature regimes (17.9 and 21.6 °C) to examine the ability of P. subalpina to protect Norway spruce seedlings against root pathogens. Seedling survival, disease intensity and seedling growth were affected by P. subalpina genotype, temperature and pathogen species. Some P. subalpina isolates effectively reduced mortality and disease intensity caused by the two pathogens. Elevated temperature adversely affected seedling growth but did not aggravate the effect of the pathogens. Elongisporangium undulatum but not P. plurivora significantly reduced plant growth. Colonization density of P. subalpina measured by quantitative PCR was not affected by temperature or the presence of the pathogens. In conclusion, P. subalpina confers an indirect benefit to its host and might therefore be tolerated in natural ecosystems, despite negative effects on plant he...Continue Reading

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Citations

Nov 20, 2013·Environmental Microbiology Reports·Vanessa Reininger, Thomas N Sieber
Dec 17, 2014·Microbial Ecology·Marco PautassoOttmar Holdenrieder
Jan 30, 2015·Frontiers in Microbiology·Keerthi G Mandyam, Ari Jumpponen
Jul 2, 2016·FEMS Microbiology Ecology·Markus SchlegelThomas N Sieber
Jan 8, 2016·Mycologia·Joey Brent TanneyKeith A Seifert
Mar 13, 2018·FEMS Microbiology Ecology·Sophie de VriesLaura E Rose
Jul 12, 2019·FEMS Microbiology Letters·Charlotte BerthelotDamien Blaudez
Aug 29, 2020·Studies in Mycology·J B Tanney, K A Seifert

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