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Two sebacinoid ectomycorrhizae on Chinese pine

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Abstract

Sebacinoid fungi show a broad mycorrhizal capacity; therefore, they play a very important role in natural systems. Worldwide, fungi of Sebacinales are present under different environmental conditions and associate with diverse plant hosts, however, are hitherto poorly studied in China. Two sebacinoid ectomycorrhizae (ECM), Pinirhiza multifurcata and Pinirhiza nondextrinoidea, are described in detail morphologically and anatomically in the present study. They share a plectenchymatous outer mantle with multiply ramified hyphae in a gelatinous matrix, clampless, thin, thick-walled emanating hyphae with mostly Y-shaped ramifications and triangular inflations at the point of ramification. P. multifurcata and P. nondextrinoidea can be distinguished by thick cells in mantle layers, the ramification of emanating hyphae, the presence or absence of rhizomorphs, as well as the differing color reaction in Melzer's reagent. The putative molecular phylogenetic relationships of P. multifurcata and P. nondextrinoidea were inferred by analyses of the partial large subunit nuclear rDNA (nLSU); however, an affiliation to fungal species was not possible. This is the first report of sebacinoid ECM on Chinese pine.

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Acknowledgments

This study was financially supported by the German Academic Exchange Service (DAAD). We thank also Prof. Yan Wei (Inner Mongolia Agricultural University, Huhhot, Inner Mongolia, China) for his support regarding field work and equipment, Fan Yongjun (Inner Mongolia Agricultural University, Huhhot, Inner Mongolia, China) for his field assistance, Derek Peršoh (University of Munich) for his useful suggestions on phylogenetic analyses, Philomena Bodensteiner for her help on improving writing, and the Management Authority of Helan Mountain National Reserve and Heilihe National Reserve for the allowance of field sampling. We thank two anonymous reviewers, whose suggestions significantly improved the manuscript.

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Correspondence to Jie Wei.

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Fig. 7

Molecular phylogenetic placement of P. multifurcata and P. nondextrinoidea among selected Sebacinales inferred by the PAUPRat analysis of nLSU sequences. Posterior probability of nodes is 1.0, except where indicated otherwise. GenBank accession numbers are given in parentheses following the species names. (PPT 59 kb)

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Wei, J., Agerer, R. Two sebacinoid ectomycorrhizae on Chinese pine. Mycorrhiza 21, 105–115 (2011). https://doi.org/10.1007/s00572-010-0312-8

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