Colonization of Pedunculate oak by the Burgundy truffle fungus is greater with natural than with pelletized lime |
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Authors: | Grechen E Pruett Johann N Bruhn Jeanne D Mihail |
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Institution: | (1) Division of Plant Sciences, University of Missouri – Columbia, 108 Waters Hall, Columbia, MO 65211, USA |
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Abstract: | European black truffles can be profitable agroforestry crops outside their native ranges. Truffle fungi grow symbiotically
as ectomycorrhizae on the roots of host trees, notably hazels and oaks. Conditions in the central USA appear conducive to
cultivation of the Burgundy truffle (Tuber aestivum Vitt. syn. T. uncinatum Chatin), but research is needed to determine effects of management practices on truffle establishment and fruiting. In a
greenhouse study we tested the effect of lime type, inoculation technique, and two truffle sources on Pedunculate oak (Quercus robur L.) growth and mycorrhizal colonization. We found that the type of lime used to raise potting mix pH can differentially affect
the growth rate of root systems inoculated with different selections of Burgundy truffle inoculum. Seedlings inoculated with
one selection of the truffle and grown in potting mixes amended with natural crushed dolomitic limestone developed larger
root systems with more truffle mycorrhizae compared with potting mix amended with high-calcium pelletized quick-release lime.
Seedlings inoculated with a second truffle selection were not affected by lime source and developed root systems as large
as those developed with the first truffle source grown with natural lime. Supplemental root dip inoculation did not improve
levels of colonization beyond those accomplished by potting mix infestation with truffle ascospores. Use of a hygroscopic
polymer to maintain ascospore suspension in the inoculum slurry used to infest the potting mix had no effect on root system
development or mycorrhiza formation. |
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Keywords: | Cultivation Mycorrhizae Quercus robur Tuber aestivum Tuber uncinatum |
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