Inherited fungal symbionts enhance establishment of an invasive annual grass across successional habitats

Plants infected with vertically transmitted fungal endophytes carry their microbial symbionts with them during dispersal into new areas. Yet, whether seed-borne endophytes enhance the host plant's ability to overcome colonisation barriers and to regenerate within invaded sites remains poorly un...

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Detalles Bibliográficos
Autor principal: Uchitel, Andrea
Otros Autores: Omacini, Marina, Chaneton, Enrique José
Formato: Artículo
Lenguaje:Inglés
Materias:
ENDOPHYTE
INVASION
MUTUALISM
NEOTYPHODIUM
RECRUITMENT
BIOLOGICAL INVASION
BIOMASS
CHRONOSEQUENCE
COLONIZATION
ENDOSYMBIONT
FUNGUS
GRASS
GROWTH RATE
HOST PLANT
INFECTIVITY
INVASIVE SPECIES
MICROBIAL ACTIVITY
RECRUITMENT [POPULATION DYNAMICS]
REGENERATION
RODENT
SEED DISPERSAL
CLASSIFICATION
ECOSYSTEM
GROWTH, DEVELOPMENT AND AGING
LOLIUM
MICROBIOLOGY
PHYSIOLOGY
PLANT SEED
POACEAE
POPULATION DENSITY
SYMBIOSIS
FUNGI
SEEDS
TIME FACTORS
ARGENTINA
PAMPAS
LOLIUM MULTIFLORUM
RODENTIA
Acceso en línea:http://ri.agro.uba.ar/files/intranet/articulo/2011Uchitel.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 Plants infected with vertically transmitted fungal endophytes carry their microbial symbionts with them during dispersal into new areas. Yet, whether seed-borne endophytes enhance the host plant's ability to overcome colonisation barriers and to regenerate within invaded sites remains poorly understood. We examined how symbiosis with asexual endophytic fungi [Neotyphodium] affected establishment and seed loss to predators in the invasive annual grass Lolium multiflorum [Italian ryegrass] across contrasting successional plots. Italian ryegrass seeds with high and low endophyte incidence were sown into three communities: a 1-year-old fallow field, a 15-year-old grassland, and a 24-year-old forest, which conformed to an old-field chronosequence in the eastern Inland Pampa, Argentina. We found that endophyte infection consistently increased host population recruitment and reproductive output. Endophyte presence also enhanced aerial biomass production of ryegrass in a low recruitment year but not in a high recruitment year, suggesting that symbiotic effects on growth performance are density dependent. Endophyte presence reduced seed removal by rodents, although differential predation may not account for the increased success of infected grass populations. Overall, there was no statistical evidence for an endophyte-by-site interaction, indicating that the fungal endosymbiont benefitted host establishment regardless of large differences in biotic and abiotic environment among communities. Our results imply that hereditary endophytes may increase the chances for host grass species to pass various ecological filters associated with invasion resistance across a broad range of successional habitats. 
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700 1 |9 6464  |a Omacini, Marina 
700 1 |9 6467  |a Chaneton, Enrique José 
773 |t Oecologia  |g Vol.165, no.2 (2011), p.465-475 
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900 |a Plants infected with vertically transmitted fungal endophytes carry their microbial symbionts with them during dispersal into new areas. Yet, whether seed-borne endophytes enhance the host plant's ability to overcome colonisation barriers and to regenerate within invaded sites remains poorly understood. We examined how symbiosis with asexual endophytic fungi [Neotyphodium] affected establishment and seed loss to predators in the invasive annual grass Lolium multiflorum [Italian ryegrass] across contrasting successional plots. Italian ryegrass seeds with high and low endophyte incidence were sown into three communities: a 1-year-old fallow field, a 15-year-old grassland, and a 24-year-old forest, which conformed to an old-field chronosequence in the eastern Inland Pampa, Argentina. We found that endophyte infection consistently increased host population recruitment and reproductive output. Endophyte presence also enhanced aerial biomass production of ryegrass in a low recruitment year but not in a high recruitment year, suggesting that symbiotic effects on growth performance are density dependent. Endophyte presence reduced seed removal by rodents, although differential predation may not account for the increased success of infected grass populations. Overall, there was no statistical evidence for an endophyte-by-site interaction, indicating that the fungal endosymbiont benefitted host establishment regardless of large differences in biotic and abiotic environment among communities. Our results imply that hereditary endophytes may increase the chances for host grass species to pass various ecological filters associated with invasion resistance across a broad range of successional habitats. 
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