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Epichloë fungal endophytes and plant defenses : not just alkaloids

Colaborador(es): Bastías, Daniel A. IFEVA, Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad de Buenos Aires, Av. San Martín 4453 Buenos Aires, C1417DSE Buenos Aires, Argentina - dabastia@agro.uba.ar | Martínez Ghersa, María Alejandra. IFEVA, Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad de Buenos Aires, Av. San Martín 4453 Buenos Aires, C1417DSE Buenos Aires, Argentina | Ballaré, Carlos Luis. IFEVA, Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad de Buenos Aires, Av. San Martín 4453 Buenos Aires, C1417DSE Buenos Aires, Argentina y IIB-INTECH, Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad Nacional de San Martín, Buenos Aires, Argentina | Gundel, Pedro Emilio. IFEVA, Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad de Buenos Aires, Av. San Martín 4453 Buenos Aires, C1417DSE Buenos Aires, Argentina.
ISSN: 1360-1385.Tipo de material: Recurso electrónico. Artículos y capítulos.Tema(s): ENDOPHYTE | SYMBIOSIS | EPICHLOË | JASMONATE | PLANT IMMUNE SYSTEM | PRIMING | Recursos en línea: Haga clic para acceso en línea | LINK AL EDITOR En: Trends in Plant Science Vol. 22, no.11 (2017), p.939-948, il.Resumen: Although the role of fungal alkaloids in protecting grasses associated with Epichloë fungal endophytes has been extensively documented, the effects of the symbiont on the host plant’s immune responses have received little attention. We propose that, in addition to producing protective alkaloids, endophytes enhance plant immunity against chewing insects by promoting endogenous defense responses mediated by the jasmonic acid (JA) pathway. We advance a model that integrates this dual effect of endophytes on plant defenses and test its predictions by means of a standard meta-analysis. This analysis supports a role of Epichloë endophytes in boosting JA-mediated plant defenses. We discuss the ecological scenarios where this effect of endophytes on plant defenses would be most beneficial for increasing plant fitness.
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Although the role of fungal alkaloids in protecting grasses associated with Epichloë fungal endophytes has been extensively documented, the effects of the symbiont on the host plant’s immune responses have received little attention.
We propose that, in addition to producing protective alkaloids, endophytes enhance plant immunity against chewing insects by promoting endogenous defense responses mediated by the jasmonic acid (JA) pathway.
We advance a model that integrates this dual effect of endophytes on plant defenses and test its predictions by means of a standard meta-analysis.
This analysis supports a role of Epichloë endophytes in boosting JA-mediated plant defenses.
We discuss the ecological scenarios where this effect of endophytes on plant defenses would be most beneficial for increasing plant fitness.

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