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This is a Experimental Study study.

October 10, 2025Forest Science

Seed Source and Mycorrhizal Fungus Effects on Growth of Containerized Pinus contorta and Pinus ponderosa Seedlings

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Greenhouse analysis shows ectomycorrhizal fungi influence growth in Pinus contorta, suggesting host genotype impacts mycorrhiza formation.

Pinus contorta seedlings showed high infection levels, positively correlating with total dry weight from fungal treatments.
Low levels of ectomycorrhizal infection in Pinus ponderosa showed no correlation with dry weight, indicating different responses to mycorrhiza.
The amount of ectomycorrhiza formation directly influenced growth benefits for the seedlings regardless of host genotype.
Host genotype affected mycorrhiza indirectly by determining the amount of ectomycorrhiza formed.

Cline et al. (1982) studied this question.

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Greenhouse analysis shows ectomycorrhizal fungi influence growth in Pinus contorta, suggesting host genotype impacts mycorrhiza formation.