Environmental context of endophyte symbioses interacting effects of water stress and insect herbivory

Symbiotic associations between grasses and fungal endophytes are generally regarded as mutualistic, yet benefits to host plants may vary with environmental context. Previous studies have emphasized how endophytes influence plant responses to single stressors. In contrast, the outcome of endophyte-gr...

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Detalles Bibliográficos
Autor principal: Miranda, María Isabel
Otros Autores: Omacini, Marina, Chaneton, Enrique José
Formato: Artículo
Lenguaje:Inglés
Materias:
DROUGHT
GRASS-ENDOPHYTE INTERACTION
HERBIVORE RESISTANCE
MULTIPLE STRESSES
MUTUALISM
PROTECTIVE SYMBIONT
APHID
DROUGHT STRESS
ENDOPHYTE
ENVIRONMENTAL CONDITIONS
ENVIRONMENTAL STRESS
EXPERIMENTAL STUDY
FUNGUS
GRASS
HERBIVORY
HOST PLANT
INSECT
INTERSPECIFIC INTERACTION
TOLERANCE
WATER STRESS
WATER SUPPLY
APHIDIDAE
HEXAPODA
LOLIUM
LOLIUM MULTIFLORUM
POACEAE
Acceso en línea:http://ri.agro.uba.ar/files/intranet/articulo/2011Miranda.pdf
LINK AL EDITOR
Aporte de:Registro referencial: Solicitar el recurso aquí
Biblioteca Central (FAUBA) de Universidad de Buenos Aires
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520 |a Symbiotic associations between grasses and fungal endophytes are generally regarded as mutualistic, yet benefits to host plants may vary with environmental context. Previous studies have emphasized how endophytes influence plant responses to single stressors. In contrast, the outcome of endophyte-grass interactions under simultaneous biotic and abiotic stresses remains poorly explored. We hypothesized that benefits from endophyte symbiosis become most apparent in "complex" environments where hosts experience multiple stresses. We evaluated the performance of endophyte-infected [E+] vs. endophyte-uninfected [E-] Lolium multiflorum plants in a factorial experiment with water supply [control vs. drought] and insect herbivory [with aphids vs. without aphids]. Endophyte infection delayed tiller production in well-watered plants, while water stress reduced tillering in E- plants. Endophyte mediation of herbivory tolerance was contingent on water supply. Whereas aphid herbivory was detrimental to E+ plants in well-watered soils, aphids interacted with drought stress in decreasing the reproductive output of E- but not E+ plants. Moreover, endophyte presence decreased aphid densities on drought-stressed plants only. Thus, endophyte symbiosis enhanced host tolerance to overlapping biotic and abiotic stresses, although infected plants failed to outgrow their uninfected counterparts. These results support the view that mutualistic endophyte effects may not arise in low-stress environments. 
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700 1 |9 6464  |a Omacini, Marina 
700 1 |9 6467  |a Chaneton, Enrique José 
773 |t International Journal of Plant Sciences  |g Vol.172, no.4 (2011), p.499-508 
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900 |a ^aIsabel Miranda^bM.^tInstituto de Investigaciones Fisiológicas, Ecologicas Vinculadas a la Agricultura-Consejo Nacional de Investigaciones Científicas, Técnicas [IFEVA-CONICET] Facultad de Agronomía, Universidad de Buenos Aires, Avenida San Martín 4453, C1417DSE, Buenos Aires, Argentina 
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