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Interactions between Tricholomopsis rutilans and ectomycorrhizal fungi in paired culture and in association with seedlings of lodgepole pine and Sitka-spruce

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Interactions between two isolates (Avondhu and CBS) of and ectomycorrhizal fungi (, and ) were examined on agar medium in the presence or absence of woodchips. The CBS isolate showed more competitiveness than the Avondhu isolate, when paired with ectomycorrhizal fungi. There was an inhibition of the growth of mycelium of the ectomycorrhizal fungi ranging from overgrowth to avoidance. The ectomycorrhizal fungi exhibited hyphal abnormalities such as discoloration, excessive vacuolation and curling. Formation of mycorrhizas by in and was unaffected by the presence of the CBS isolate, whereas a reduction occurred in the presence of the Avondhu isolate. In non-mycorrhizal seedlings of both conifers, the Avondhu isolate reduced root and shoot dry mass and number of root laterals and caused a lower number of short roots in lodgepole pine. The significance of these interactions between and ectomycorrhizal fungi in paired culture and during symbiosis is discussed.

Interactions entre Tricholomopsis rutilans et des champignons ectomycorhiziens en confrontation culturale et en association avec des semis de Pinus contorta et de Picea sitchensis

Les interactions entre deux isolats de Tricholomopsis rutilans (Avondhu et CBS), et les champignons ectomycorhiziens Hebeloma crustuliniforme, Laccaria laccata et Paxillus involutus, ont étéétudiées sur milieu gélosé en présence ou absence de copeaux de bois. L’isolat CBS s’est montré plus compétitif que l’isolat Avondhu dans les confrontations avec les ectomycorhiziens. Il y avait une inhibition de la croissance mycélienne des ectomycorhiziens allant de l’envahissement à l’évitement. Les hyphes des ectomycorhiziens présentaient des anomalies telles que la coloration, la vacuolisation excessive et l’enroulement. La formation de mycorhizes par H. crustuliniforme chez Pinus contorta et Picea abies n’était pas affectée en présence de l’isolat CBS mais une réduction avait lieu en présence de l’isolat Avondhu. Chez les plants non mycorhizés des deux résineux, l’isolat Avondhu réduisait le poids sec des racines et des pousses et le nombre de racines latérales; chez le pin il réduisait le nombre de racines courtes. La signification de ces interactions entre T. rutilans et les champignons ectomycorhiziens en culture et durant la symbiose est discutée.

Document Type: Research Article

DOI: http://dx.doi.org/10.1046/j.1439-0329.2001.00253.x

Affiliations: Department of Botany, University College Dublin, Dublin 4, Ireland

Publication date: December 1, 2001

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