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Effects of available water on growth and competition of southern pine beetle associated fungi

Tipo de material: Artículo impreso(a) y electrónico Artículo impreso(a) y electrónico Idioma: Inglés Recurso en línea: Formatos físicos adicionales disponibles:
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 En: Mycological Research volumen 108, número 2 (2004), páginas 183-188Nota de acceso: Acceso en línea sin restricciones Resumen:
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Competitive interactions among bark beetle associated fungi are potentially influenced by abiotic factors. Water potential, in particular, undergoes marked changes over the course of beetle colonization of tree hosts. To investigate the impact of water potential on competition among three southern pine beetle associated fungi, Ophiostoma minus, Entomocoeticium sp. A and Ceratocystiopsis ranaculosus, we utilized artificial media with water potentials. Growth rates of all three fungi were likewise reduced in competition experiments. AT -5 to -10 MPa, C. ranaculosus (a fungus with beneficial effects toward southern pine beetle) was nearly equal in competitive ability to O. minus ( a fungus with antagonistiv effects towards sountern pine beetle). This was not true on control media, nor at other water potentials tested. The range of water potentials used in our assays was similar to the range of water potentials we measured in loblolly pines within a southern pine beetle infestation. This study indicates that water potential may alter the outcome of competitive interactions among bark beetle-associated fungi in ways that favour bark beetle success.

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Acceso en línea sin restricciones

Competitive interactions among bark beetle associated fungi are potentially influenced by abiotic factors. Water potential, in particular, undergoes marked changes over the course of beetle colonization of tree hosts. To investigate the impact of water potential on competition among three southern pine beetle associated fungi, Ophiostoma minus, Entomocoeticium sp. A and Ceratocystiopsis ranaculosus, we utilized artificial media with water potentials. Growth rates of all three fungi were likewise reduced in competition experiments. AT -5 to -10 MPa, C. ranaculosus (a fungus with beneficial effects toward southern pine beetle) was nearly equal in competitive ability to O. minus ( a fungus with antagonistiv effects towards sountern pine beetle). This was not true on control media, nor at other water potentials tested. The range of water potentials used in our assays was similar to the range of water potentials we measured in loblolly pines within a southern pine beetle infestation. This study indicates that water potential may alter the outcome of competitive interactions among bark beetle-associated fungi in ways that favour bark beetle success. Inglés

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