Journal
MYCORRHIZA
Volume 18, Issue 8, Pages 393-401Publisher
SPRINGER
DOI: 10.1007/s00572-008-0193-2
Keywords
ectomycorrhizal (ECM) fungi; ectendomycorrhizal (EEM) fungi; root hydraulic conductivity (L-pr); transpiration rate; root-water relations
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Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Discovery Research Grant
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The effects of an E-strain fungus (Wilcoxina mikolae var. mikolae) and an ectomycorrhizal fungus (Hebeloma crustuliniforme) on growth and water relations of balsam poplar were examined and compared in the present study. Balsam poplar roots inoculated with W. mikolae var. mikolae (Wm) exhibited structures consistent with ectendomycorrhizal (EEM) associations, including a mantle surrounding the outside of the root and an extensive Hartig net that was located between cortical cells and extended to the vascular cylinder. Roots colonized with H. crustuliniforme (Hc) developed a mantle layer, indicative of an ectomycorrhizal (ECM) association, around the outer part of the root, but no distinct Hartig net was present. Wm-colonized balsam poplar also showed increased shoot growth, stomatal conductance (g(s)), and root volumes compared with non-inoculated and Hc-inoculated plants. However, Hc-inoculated plants had higher root hydraulic conductivity (L-pr) compared with non-inoculated plants and Wm-inoculated plants. These results suggest that L-pr was not a growth-limiting factor in balsam poplar and that hyphal penetration of the root cortex in itself may have little influence on root hydraulic properties.
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