Journal
MYCORRHIZA
Volume 21, Issue 7, Pages 589-600Publisher
SPRINGER
DOI: 10.1007/s00572-011-0364-4
Keywords
Enzyme activity profiling; Sample storage; Ectomycorrhizae; Method optimization
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Funding
- French National Research Agency [ANR-06-BDIV-06]
- German Research Foundation (DFG) [SFB607]
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The aim of a joint effort by different research teams was to provide an improved procedure for enzyme activity profiling of field-sampled ectomycorrhizae, including recommendations on the best conditions and maximum duration for storage of ectomycorrhizal samples. A more simplified and efficient protocol compared to formerly published procedures was achieved by using manufactured 96-filter plates in combination with a vacuum manifold and by optimizing incubation times. Major improvements were achieved by performing the series of eight enzyme assays with a single series of root samples instead of two series, reducing the time needed for sample preparation, minimizing error-prone steps such as pipetting and morphotyping, and facilitating subsequent DNA analyses due to the reduced sequencing effort. The best preservation of samples proved to be storage in soil at 4-6A degrees C in the form of undisturbed soil cores containing roots. Enzyme activities were maintained for up to 4 weeks under these conditions. Short-term storage of washed roots and ectomycorrhizal tips overnight in water did not cause substantial changes in enzyme activity profiles. No optimal means for longer-term storage by freezing at -20A degrees C or storage in 100% ethanol were recommended.
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