The plant hormone salicylic acid interacts with the mechanism of anti‐herbivory conferred by fungal endophytes in grasses

Daniel A. Bastías; M. Alejandra Martínez‐Ghersa; Jonathan A. Newman; Stuart D. Card; Wade J. Mace; Pedro E. Gundel

doi:10.1111/pce.13102

journal article Jan 09, 2018

The plant hormone salicylic acid interacts with the mechanism of anti‐herbivory conferred by fungal endophytes in grasses

Daniel A. Bastías

M. Alejandra Martínez‐Ghersa Jonathan A. Newman

Stuart D. Card

Wade J. Mace Pedro E. Gundel

Plant, Cell & Environment Vol. 41 No. 2 pp. 395-405 · Wiley

View at Publisher Save 10.1111/pce.13102

Abstract

AbstractThe plant hormone salicylic acid (SA) is recognized as an effective defence against biotrophic pathogens, but its role as regulator of beneficial plant symbionts has received little attention. We studied the relationship between the SA hormone and leaf fungal endophytes on herbivore defences in symbiotic grasses. We hypothesize that the SA exposure suppresses the endophyte reducing the fungal‐produced alkaloids. Because of the role that alkaloids play in anti‐herbivore defences, any reduction in their production should make host plants more susceptible to herbivores. Lolium multiflorum plants symbiotic and nonsymbiotic with the endophyte Epichloë occultans were exposed to SA followed by a challenge with the aphid Rhopalosiphum padi. We measured the level of plant resistance to aphids, and the defences conferred by endophytes and host plants. Symbiotic plants had lower concentrations of SA than did the nonsymbiotic counterparts. Consistent with our prediction, the hormonal treatment reduced the concentration of loline alkaloids (i.e., N‐formyllolines and N‐acetylnorlolines) and consequently decreased the endophyte‐conferred resistance against aphids. Our study highlights the importance of the interaction between the plant immune system and endophytes for the stability of the defensive mutualism. Our results indicate that the SA plays a critical role in regulating the endophyte‐conferred resistance against herbivores.

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Metrics

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Citations

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References

Details

Published: Jan 09, 2018
Vol/Issue: 41(2)
Pages: 395-405
License: View

Authors

D

Daniel A. Bastías

IFEVA, Consejo Nacional de Investigaciones Científicas y Técnicas Universidad de Buenos Aires Av. San Martín 4453 Buenos Aires C1417DSE Argentina

M

M. Alejandra Martínez‐Ghersa

IFEVA, Consejo Nacional de Investigaciones Científicas y Técnicas Universidad de Buenos Aires Av. San Martín 4453 Buenos Aires C1417DSE Argentina

J

Jonathan A. Newman

Department of Integrative Biology University of Guelph Guelph Ontario N1G 2W1 Canada

S

Stuart D. Card

Forage Science, AgResearch Limited Grasslands Research Centre Private Bag 11008 Palmerston North 4442 New Zealand

W

Wade J. Mace

Forage Science, AgResearch Limited Grasslands Research Centre Private Bag 11008 Palmerston North 4442 New Zealand

P

Pedro E. Gundel

IFEVA, Consejo Nacional de Investigaciones Científicas y Técnicas Universidad de Buenos Aires Av. San Martín 4453 Buenos Aires C1417DSE Argentina

Funding

Universidad de Buenos Aires Award: UBACYT 2014‐30BA

Canadian Network for Research and Innovation in Machining Technology, Natural Sciences and Engineering Research Council of Canada

AgResearch

Cite This Article

Daniel A. Bastías, M. Alejandra Martínez‐Ghersa, Jonathan A. Newman, et al. (2018). The plant hormone salicylic acid interacts with the mechanism of anti‐herbivory conferred by fungal endophytes in grasses. Plant, Cell & Environment, 41(2), 395-405. https://doi.org/10.1111/pce.13102

The plant hormone salicylic acid interacts with the mechanism of anti‐herbivory conferred by fungal endophytes in grasses

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