Ectomycorrhizal fungal maladaptation and growth reductions associated with assisted migration of Douglas‐fir

• Published in: The New phytologist Vol. 206; no. 3; pp. 1135 - 1144
• Main Authors: Kranabetter, J. Marty, Stoehr, Michael, O'Neill, Greg A
• Format: Journal Article
• Language: English
• Published: England Academic Press 01-05-2015; New Phytologist Trust; Wiley Subscription Services, Inc
• Subjects: Adaptation; Adaptation, Physiological; Assisted migration; British Columbia; Climate; Climate adaptation; Climate effects; coevolution; Conifers; DNA, Fungal - chemistry; ectomycorrhizae; ectomycorrhizal fungi (EMF); Ectomycorrhizas; Electromagnetic fields; Fertility; Fungi; Genecology; Growth; Height; Host Specificity; Hosts; Low frequency; maladaptation; Molecular Sequence Data; Mycorrhizae - classification; Mycorrhizae - genetics; Mycorrhizae - physiology; mycorrhizal fungi; Nitrogen; Nitrogen - analysis; nitrogen content; Optimization; planting; Populations; Pseudotsuga - microbiology; Pseudotsuga menziesii; Pseudotsuga menziesii var. menziesii; Soil; Soil - chemistry; Soil fertility; Soil Microbiology; Soil microorganisms; soil nitrogen; Soil testing; Soils; Specificity; δ15N; British Columbia; maladaptation; coevolution; genecology; δ15N; ectomycorrhizal fungi (EMF); assisted migration; soil nitrogen
• ISSN: 0028-646X; 1469-8137
• DOI: 10.1111/nph.13287

Climatic adaptations are the foundation of conifer genecology, but populations also display variation in traits for nitrogen (N) utilization, along with some heritable specificity for ectomycorrhizal fungi (EMF). We examined soil and EMF influences on assisted migration of Douglas‐fir (Pseudotsuga menziesii var. menziesii) by comparing two contrasting maritime populations planted up to 400 km northward in southwestern British Columbia. Soil N availability and host N status (via δ¹⁵N) were assessed across 12 maritime test sites, whereas EMF on local and introduced hosts were quantified by morphotyping with molecular analysis. Climatic transfer effects were only significant with soil N concentrations of test sites as a covariate, and illustrated how height growth was compromised for populations originating from relatively dry or cool maritime environments. We also found evidence for EMF maladaptation, where height declined by up to 15% with the extent of dissimilarity in EMF communities of southern populations relative to local hosts. The results demonstrate how geographic structure in belowground environments can contribute to conifer genecology. Differences in the inherent growth potential of conifers may be partly related to nutritional adaptations arising under native soil fertility, and optimization of this growth potential likely requires close affiliation with local EMF communities.