La1994

Référence

de La Bastide, P.Y. (1994) Population ecology and genetics of the ectomycorrhizal basidiomycete Laccaria bicolor (Maire) Orton. Thèse de doctorat, Université Laval.

Résumé

The population ecology, genetic variability, reproductive strategies and mycelial interactions of the ectomycorrhizal fungus Laccaria bicolor were studied to better understand its population genetics and development. The spatial distribution and temporal persistence of sporophore genotypes were examined for mycorrhizal mycelia in a Picea abies plantation. This study provided good evidence that a single genotype can dominate a root system and persist for at least three years. The fungal mycelium also varied annually in its spatial distribution. Sporophore mating type in the same population varied among sites and shared few alleles with nearby L. bicolor populations. Significant variations in mycelial growth rate and calcium phosphate solubilization were detected for dikaryotic sporophore isolates. The development of genetically variable mycorrhizal mycelia was studied in vitro for single Pinus banksiana seedlings, inoculated initially with a dikaryotic genotype, later with basidiospores, or both. The genotypic variability of the sporophores produced was greatest with basidiospore inoculum. For mixed treatments, they were most often the dikaryotic genotype inoculated initially, which was the favoured competitor. Dikaryon-monokaryon crosses were not detected. Mycelial interactions of strains in pure culture and with a host seedling were also assessed. The rate of dikaryotization and the occurrence of nuclear migration and dikaryon-monokaryon matings varied among crosses on agar medium. For P. banksiana seedlings inoculated with selected pairs of these strains, the genotypes of root reisolates were variable for isolates from the same seedling. These included a new dikaryon produced from a dikaryon-monokaryon cross. The genetic development of L. bicolor populations will be shaped by both dispersed basidiospores and mycelial expansion. It will also be influenced by inoculum availability, mycelial interactions and site conditions. More than one genotype can colonize a host root system, which may be useful in heterogeneous soils. Dikaryotic genotypes can persist and dominate a root system, limiting colonization by other genotypes. However, mycorrhizal mycelia may be modified by dikaryon-monokaryon crosses with aggressive monokaryotic strains. This could be beneficial to both plant and fungus as soils change with forest succession.

Format EndNote

Vous pouvez importer cette référence dans EndNote.

Format BibTeX-CSV

Vous pouvez importer cette référence en format BibTeX-CSV.

Format BibTeX

Vous pouvez copier l'entrée BibTeX de cette référence ci-bas, ou l'importer directement dans un logiciel tel que JabRef .

@PHDTHESIS { La1994,
    AUTHOR = { de La Bastide, P.Y. },
    TITLE = { Population ecology and genetics of the ectomycorrhizal basidiomycete Laccaria bicolor (Maire) Orton },
    SCHOOL = { Université Laval },
    YEAR = { 1994 },
    NOTE = { CEFTMS, Piche, Y. and Kropp, B.R., Paul Yves de La Bastide. Thèse (de doctorat) Pqdt Texte en anglais, résumés en français et en anglais. Thèse (Ph. D.)--Université Laval, 1994. Bibliogr.: f. [117]-129. Thèse. Foresterie et géodésie Piché, Yves, directeur de thèse Kropp, Bradley R., directeur de thèse },
    ABSTRACT = { The population ecology, genetic variability, reproductive strategies and mycelial interactions of the ectomycorrhizal fungus Laccaria bicolor were studied to better understand its population genetics and development. The spatial distribution and temporal persistence of sporophore genotypes were examined for mycorrhizal mycelia in a Picea abies plantation. This study provided good evidence that a single genotype can dominate a root system and persist for at least three years. The fungal mycelium also varied annually in its spatial distribution. Sporophore mating type in the same population varied among sites and shared few alleles with nearby L. bicolor populations. Significant variations in mycelial growth rate and calcium phosphate solubilization were detected for dikaryotic sporophore isolates. The development of genetically variable mycorrhizal mycelia was studied in vitro for single Pinus banksiana seedlings, inoculated initially with a dikaryotic genotype, later with basidiospores, or both. The genotypic variability of the sporophores produced was greatest with basidiospore inoculum. For mixed treatments, they were most often the dikaryotic genotype inoculated initially, which was the favoured competitor. Dikaryon-monokaryon crosses were not detected. Mycelial interactions of strains in pure culture and with a host seedling were also assessed. The rate of dikaryotization and the occurrence of nuclear migration and dikaryon-monokaryon matings varied among crosses on agar medium. For P. banksiana seedlings inoculated with selected pairs of these strains, the genotypes of root reisolates were variable for isolates from the same seedling. These included a new dikaryon produced from a dikaryon-monokaryon cross. The genetic development of L. bicolor populations will be shaped by both dispersed basidiospores and mycelial expansion. It will also be influenced by inoculum availability, mycelial interactions and site conditions. More than one genotype can colonize a host root system, which may be useful in heterogeneous soils. Dikaryotic genotypes can persist and dominate a root system, limiting colonization by other genotypes. However, mycorrhizal mycelia may be modified by dikaryon-monokaryon crosses with aggressive monokaryotic strains. This could be beneficial to both plant and fungus as soils change with forest succession. },
    KEYWORDS = { Laccaria bicolor Écologie Laccaria bicolor Génétique Plantes Populations Génétique },
    OWNER = { brugerolles },
    TIMESTAMP = { 2008.01.16 },
}

********************************************************** ***************** Facebook Twitter *********************** **********************************************************

Abonnez-vous à
l'Infolettre du CEF!

********************************************************** ***************** Pub - Mycorhizes_2019 ****************** **********************************************************

********************************************************** ***************** Pub - Symphonies_Boreales ****************** **********************************************************

********************************************************** ***************** Boîte à trucs *************** **********************************************************

CEF-Référence
La référence vedette !

Jérémie Alluard (2016) Les statistiques au moments de la rédaction 

  • Ce document a pour but de guider les étudiants à intégrer de manière appropriée une analyse statistique dans leur rapport de recherche.

Voir les autres...