Even after death the endophytic fungus of Schedonorus phoenix reduces the arbuscular mycorrhizas of other plants

dc.contributor.affiliationSchool of Environmental Sciences
dc.contributor.authorAntunes, P.
dc.contributor.authorMiller, J.
dc.contributor.authorCarvalho, L.
dc.contributor.authorKlironomos, J.
dc.contributor.authorNewman, Jonathan A.
dc.date.accessioned2012-02-08T16:22:37Z
dc.date.available2012-02-08T16:22:37Z
dc.date.issuedOct-08
dc.degree.departmentSchool of Environmental Sciencesen
dc.description.abstract1 Plants can host microbial communities whose integrated functions are often responsible for their success. Understanding mechanisms regulating such functions is thus a major goal in ecology. 2 Fungal endophytes of grasses, particularly of the genus Neotyphodium, have been reported to reduce colonization of their host plant by arbuscular mycorrhizal (AM) fungi. However, it is unclear which mechanism(s) may explain the effects produced by the endophyte and whether these effects are present in nature. 3 We used Schedonorus phoenix (syn. Lolium arundinaceum) plants that were endophyte-free or infected with one of two strains of Neotyphodium coenophialum known to produce different putative allelochemicals to test the hypotheses that (i) allelopathic effects of the endophyte reduce AM fungal spore germination; and (ii) the allelochemical compound(s) are leached into the soil even after the death of S. phoenix, where they reduce AM fungal colonization of other plants. 4 In a first experiment, aqueous extracts from the shoots of S. phoenix were applied onto spores of the AM fungus Glomus intraradices to test germination effects. Both endophyte strains reduced spore germination by approximately 10% relative to endophyte-free controls. 5 In a second experiment, we placed dried shoot material (‘thatch’) on the soil surface of pots containing Bromus inermis, which were either inoculated with G. intraradices or not. We watered the plants through the thatch, relying upon leaching to translocate potential allelochemicals to the soil. AM fungal colonization of B. inermis was significantly reduced when thatch was infected with the common strain, but not with AR542, compared to the endophyte-free thatch. Furthermore, the arbuscule : vesicle ratio was 11-fold smaller when thatch was infected with the common strain compared to endophyte-free thatch, suggesting that G. intraradices was stressed by the presence of common strain-leachate. 6 We observed situations whereby two ecologically widespread plant-microbe symbioses interact. Potential mechanisms may include allelopathic effects, although other factors are also possible, and leaching is a mode of entry of putative endophyte-induced AM fungal inhibitors in soil. Understanding these processes is important as they affect AM fungal communities which contribute to plant success and, consequentially, grassland ecosystem dynamics.en_US
dc.identifier.citationAntunes, P. M., Miller, J., Carvalho, L. M., Klironomos, J. N. and Newman, J. A. "Even after death the endophytic fungus of Schedonorus phoenix reduces the arbuscular mycorrhizas of other plants." Functional Ecology 22.5 (2008): 912–918. https://doi.org/10.1111/j.1365-2435.2008.01432.x.
dc.identifier.urihttp://hdl.handle.net/10214/3320
dc.language.isoenen_US
dc.rights.licenseAll items in the Atrium are protected by copyright with all rights reserved unless otherwise indicated.
dc.subjectarbuscular mycorrhizal fungien_US
dc.subjectallelopathyen_US
dc.subjectAMFen_US
dc.subjectSchedonorus phoenixen_US
dc.subjectNeotyphodiumen_US
dc.subjectendophyteen_US
dc.subjectspore germinationen_US
dc.titleEven after death the endophytic fungus of Schedonorus phoenix reduces the arbuscular mycorrhizas of other plantsen_US
dc.typeArticleen

Files

Original bundle
Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
j.1365-2435.2008.01432.x-1.pdf
Size:
344.95 KB
Format:
Adobe Portable Document Format
Description:
Article
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.76 KB
Format:
Item-specific license agreed upon to submission
Description:

Collections