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Artículo

Dynamics of Neotyphodium endophyte infection in ageing seed pools: Incidence of differential viability loss of endophyte, infected seed and non-infected seed

Gundel, Pedro EmilioIcon ; Martinez-Ghersa, Maria AlejandraIcon ; Batista, William B.; Ghersa, Claudio MarcoIcon
Fecha de publicación: 03/2010
Editorial: Wiley Blackwell Publishing, Inc
Revista: Annals of Applied Biology
ISSN: 0003-4746
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Otras Ciencias Biológicas; Otras Ciencias Biológicas

Resumen

Symbiotic associations between grasses and vertically transmitted endophytic fungi are widespread in nature. Within grass populations, changes in the frequency of infected plants are driven by influence of the endophyte on the fitness of their hosts and by the efficiency of endophyte transmission from parent plants to their offspring. During the seed stage, the endophyte might influence the fitness of its host by affecting the rate of seed viability loss, whereas the efficiency of endophyte transmission is affected by losses of viability of the fungus within viable seeds. We assessed the viability losses of Lolium multiflorum seeds with high and low level of infection of the endophyte Neotyphodium occultans, as well as the loss of viability of the fungus itself, under accelerated seed ageing and under field conditions. Starting with high endophyte-infected accessions of L. multiflorum, we produced their low endophyte-infected counterparts by treating seeds with a fungicide, and subsequently multiplying seeds in adjacent plots allowing pollen exchange. In our accelerated ageing experiments, which included three accessions, high endophyte-infected seeds lost viability significantly faster than their low endophyte-infected counterpart, for only one accession. High endophyteinfected seeds of this particular accession absorbed more water than low endophyte-infected seeds. In contrast, the endophyte lost viability within live seeds of all three accessions, as the proportions of viable seeds producing infected seedlings decreased over time. In our field experiment, which included only one accession, high endophyte-infected seed lost viability significantly but only slightly faster than low endophyte-infected seed. In contrast, the loss of viability of the endophyte was substantial as the proportions of viable seeds producing infected seedlings decreased greatly over time. Moving the seeds from the air to the soil surface (simulating seed dispersion off the spikes) decreased substantially the rate of seed viability loss, but increased the rate of endophyte viability loss. Our experiments suggest that, in ageing seed pools, endophyte viability loss and differential seed mortality determine decreases in the proportions of endophyte-infected seeds in L. multiflorum. Endophyte viability loss within live seeds contributes substantially more to infection frequency changes than differential viability losses of infected and non-infected seeds. © 2009 Association of Applied Biologists.
Palabras clave: Annual Ryegrasse , Endophyte-Grass Symbiosis , Epichloe , Lolium Multiflorum , Mutualism , Simbiotic Interactions
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/71911
DOI: https://doi.org/10.1111/j.1744-7348.2009.00379.x
URL: https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1744-7348.2009.00379.x
Colecciones
Articulos(IFEVA)
Articulos de INST.D/INV.FISIOLOGICAS Y ECO.VINCULADAS A L/AGRIC
Citación
Gundel, Pedro Emilio; Martinez-Ghersa, Maria Alejandra; Batista, William B.; Ghersa, Claudio Marco; Dynamics of Neotyphodium endophyte infection in ageing seed pools: Incidence of differential viability loss of endophyte, infected seed and non-infected seed; Wiley Blackwell Publishing, Inc; Annals of Applied Biology; 156; 2; 3-2010; 199-209
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