Protection offered by leaf fungal endophytes to an invasive species against native herbivores depends on soil nutrients

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1. Natural grassland ecosystems are increasingly threatened by excessive loadings of nutrients and by the presence of species bred for high productivity. By manipulating grazing regimes and nutrient availability, agricultural practices facilitate the establishment and spread of certain forage plant...

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Detalles Bibliográficos
Otros Autores: Graff, Bárbara Pamela, Gundel, Pedro Emilio, Salvat, Adriana E., Cristos, Diego, Chaneton, Enrique José
Formato: Artículo
Lenguaje:Inglés
Materias:
CATERPILLARS
ERGOVALINE
NITROGEN
PARACLES VULPINA
PHOSPHORUS
PLANT INVASION
PLANT–HERBIVORE INTERACTION
TALL FESCUE
Acceso en línea:http://ri.agro.uba.ar/files/intranet/articulo/2020graff.pdf
LINK AL EDITOR
Aporte de:Registro referencial: Solicitar el recurso aquí
Biblioteca Central (FAUBA) de Universidad de Buenos Aires
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245 1 0 |a Protection offered by leaf fungal endophytes to an invasive species against native herbivores depends on soil nutrients 
520 |a 1. Natural grassland ecosystems are increasingly threatened by excessive loadings of nutrients and by the presence of species bred for high productivity. By manipulating grazing regimes and nutrient availability, agricultural practices facilitate the establishment and spread of certain forage plant species outside managed landscapes, challenging local biodiversity. The ecological success of some species in the invaded range sometimes seems to be associated with the symbiosis with foliar fungal endophytes. Symbiotic fungi may increase the competitiveness of host species, but also the resistance to herbivory through the production of toxic secondary compounds such as alkaloids. While progress has been made in understanding how soil nutrients modulate other benefits offered by fungal endophytes to plants (e.g. stress tolerance, competitive ability, etc), the consequences for a higher trophic level (i.e. herbivores) and the potential feedbacks on plant invasion have not been explored yet. 2. We explored the relative and interactive importance of soil nitrogen (N) and phosphorus (P) in modulating the interaction of the invasive grass tall fescue—associated with fungal endophytes—and native herbivores in a natural grassland. We hypothesized that N and P nutrients modulate differentially leaf quality traits, namely nutritional value and fungal alkaloid contents, determining the level of damage by native insect herbivores on the exotic tall fescue. 3. We found that only the addition of P significantly increased native caterpillar density in the field, which corresponded to a concomitant increase in leaf damage. In contrast to expectations, the concentration of the alkaloid ergovaline in leaves was not strongly related to N. It was the level of soil P which dictated the concentration of the element (P) in the leaves and reduced the level of defence against herbivores in this endophyte-symbiotic species. Then, herbivore performance increased, and plants were more prone to be attacked. 4. Synthesis. Our study indicates a strong control of soil P fertility on the triple interaction among plants, fungal endophytes and native herbivores. This highlights the potential role of increased soil nutrients on the invasion spread of endophytesymbiotic forage plants in natural grasslands. 
650 |2 Agrovoc  |9 26 
653 |a CATERPILLARS 
653 |a ERGOVALINE 
653 |a NITROGEN 
653 |a PARACLES VULPINA 
653 |a PHOSPHORUS 
653 |a PLANT INVASION 
653 |a PLANT–HERBIVORE INTERACTION 
653 |a TALL FESCUE 
700 1 |a Graff, Bárbara Pamela  |u Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Recursos Naturales y Ambiente. Buenos Aires, Argentina.  |u Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.  |u CONICET – Universidad de Buenos Aires. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.  |9 29339 
700 1 |a Gundel, Pedro Emilio  |u Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Recursos Naturales y Ambiente. Buenos Aires, Argentina.  |u Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.  |u CONICET – Universidad de Buenos Aires. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.  |9 28667 
700 1 |a Salvat, Adriana E.  |u Instituto Nacional de Tecnología Agropecuaria (INTA). Laboratorio de Toxicología. Área de Patología. Instituto de Patobiología. (CICVyA). Hurlingham, Buenos Aires, Argentina.  |9 46725 
700 1 |a Cristos, Diego  |u Instituto Nacional de Tecnología Agropecuaria (INTA). Buenos Aires, Argentina. Instituto Nacional de Tecnología Agropecuaria (INTA). Area de Protección de Alimentos, Instituto Tecnología de Alimentos Centro de Investigación de Agroindustria (CIA-INTA). Hurlingham, Buenos Aires, Argentina.  |9 71931 
700 1 |a Chaneton, Enrique José  |u Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Recursos Naturales y Ambiente. Buenos Aires, Argentina.  |u Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.  |u CONICET – Universidad de Buenos Aires. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.  |9 6467 
773 0 |t Journal of Ecology  |g vol.108, no.4 (2020), p.1592–1604, grafs., fot. 
856 |f 2020graff  |i en reservorio  |q application/pdf  |u http://ri.agro.uba.ar/files/intranet/articulo/2020graff.pdf  |x ARTI202011 
856 |z LINK AL EDITOR  |u https://www.wiley.com/ 
942 |c ARTICULO 
942 |c ENLINEA 
976 |a AAG 

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