Abstract
Background and aims
Ectomycorrhizal (ECM) fungal communities are affected by many abiotic and biotic factors, among which host identity is often regarded as the most significant. Although little about ECM fungal communities on endangered tree species is known, knowledge of their ECM associations could be a key to conservation given the functional importance of the symbiosis.
Methods
We collected 73 soil samples from three relict forests dominated by endangered Chinese Douglas-fir (Pseudotsuga sinensis). Identity of fungal and host species in individual ECM tips was determined by morphotyping and DNA analyses.
Results
Of the 86 ECM fungal species identified, 66 were observed on Chinese Douglas-firs. While the fungal composition did not significantly differ between coexisting trees (p = 0.843), the composition was significantly separated based on location (p = 0.021). Moreover, the observed ECM fungal communities were dissimilar to those on the Japanese Douglas-fir (p = 0.001), which is monophyletic to Chinese Douglas-fir.
Conclusions
Our results indicate that ECM fungal communities are determined more by geographical location than host monophyly on this spatial (c.770–1,600 km) and geological time scale ( c. 20–25 My). For conservation of endangered trees, it may be important to preserve local ECM fungal pools, irrespective of host species.
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Acknowledgments
This research was funded by an award from the China Scholarship Council to ZW, by Japan Society for the Promotion of Science KAKENHI Grants to KN (25257411, 25660115, 25304026), and by an award from the National Natural Science Foundation of China-Guangdong Province Natural Science Foundation Joint Research Fund to YC (U1133004). We also thank Liang Shi, Haolin Zhu, and Qizhi Zha for their support in field sampling.
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The authors declare no conflict of interest associated with this manuscript.
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Wen, Z., Murata, M., Xu, Z. et al. Ectomycorrhizal fungal communities on the endangered Chinese Douglas-fir (Pseudotsuga sinensis) indicating regional fungal sharing overrides host conservatism across geographical regions. Plant Soil 387, 189–199 (2015). https://doi.org/10.1007/s11104-014-2278-3
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DOI: https://doi.org/10.1007/s11104-014-2278-3