Écophysiologie de semis de conifères ectomycorhizés en milieu salin et sodique
|Advisor:||Khasa, Damase P.; Piché, Yves|
|Abstract:||The physiological response of inoculated ectomycorrhizal (ECM) white spruce (Picea glauca (Moench) Voss) and jack pine (Pinus banksiana Lamb.) seedlings to sodic stress was evaluated to determine the benefits of inoculation for growth and survival. These experiments served the improvement of nursery seedling production for revegetation of reconstructed soils from tailing sands originating from the oil sand mining in Northeastern Alberta (Canada). In a first step, we showed that the inoculum potential of reconstructed soils of different ages and materials used in soil reconstruction was very low or null. In a second step, the resistance and physiological response of five ecto- and ectendomycorrhizal fungal species (Hymenoscyphus sp., Phialocephala sp., Suillus tomentosus (Kauff.) Sing., Snell and Dick, Laccaria bicolor (Maire) Orton, Hebeloma crustuliniforme (Bull) Quel.) from different sources were assessed in vitro. Finally, white spruce and jack pine seedlings inoculated in greenhouse with the three ECM fungi evaluated in vitro were exposed to different concentrations of NaCl. Using several physiological indicators, mycobionts were showed to influence host response to a given NaCl concentration. Under sodic conditions, inoculation with an isolate of S. tomentosus from a saline and sodic site increased seedling biomass production and inoculation with an isolate of H. crustuliniforme increased seedling osmotic adjustment capabilities. The latter two fungi are potential candidates for tree nursery inoculation.|
|Document Type:||Thèse de doctorat|
|Open Access Date:||11 April 2018|
|Collection:||Thèses et mémoires|
All documents in CorpusUL are protected by Copyright Act of Canada.