Étude des relations source/puits de carbone dans la symbiose endomycorhizienne à arbuscules

Authors: Lerat, Sylvain
Advisor: Lapointe, LinePiché, Yves
Abstract: Different aspects of the carbon (C) source-sink relationships in the arbuscular mycorrhizal (AM) symbiosis were investigated. In an initial ecophysiological-based study carried under natural conditions, the existence of AM fungal mediated C exchanges between plant species with different phenology was reported. Two physiological studies based on a split-root system showed the C sink strength of AM fungi to be fungal species, fungal strain and plant species dependent. Finally, an ecological study carried out subsequently to the ice storm of 1998 (natural disturbance) which severely damaged mature tree crowns revealed that poor post-traumatic crown regrowth was associated with higher mycorrhizal colonization levels than in good regrowth trees. In conclusion, the C demand of AM fungi varies with the species involved in the symbiosis and with the phenological stage and health of the phytobiont.
Document Type: Thèse de doctorat
Issue Date: 2003
Open Access Date: 11 April 2018
Permalink: http://hdl.handle.net/20.500.11794/17795
Grantor: Université Laval
Collection:Thèses et mémoires

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