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Isolation by landscape in populations of a prized edible mushroom Tricholoma matsutake

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Abstract

Tricholoma matsutake, a wild edible ectomycorrhizal mushroom, is revered for its distinguished flavor and iconic significance. Here, we test for landscape effects on T. matsutake gene flow and population structure in the Eastern Himalayas. Using single-nucleotide polymorphic (SNP) DNA markers, isolation by distance patterns were tested on eight populations within and between watersheds. We find that high, treeless ridgelines are effective barriers to gene flow, even at distances less than 65 km, whereas populations located within watersheds are structured at greater distances. Mantel tests demonstrated a significant positive correlation between Fst and a “landscape distance” measured as the shortest distance between population pairs below treeline r = 0.574, P = 0.002, whereas strict euclidian distances do not correlate. AMOVA analysis revealed significant partitioning with 91% of the genetic variance found within populations and 7% found between watersheds, indicative of sexually recombining populations with limited gene flow between watersheds. We show that landscape is an important determinant of air-dispersed ectomycorrhizal species population structure in heterogeneous landscapes.

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Acknowledgments

This work was supported by grants from the BP Conservation Programme, the Richard E. Schultes award from the Society for Economic Botany, and NSF Grant No. DGE-0232016 to Dr. Kenneth Y. Kaneshiro of the Center for Conservation Research and Training at the University of Hawaii at Manoa. We are grateful to Cui Yi, Cina Wongji and Cilin Qipin for their assistance in the field, and the people and municipal governments of the villages in which these studies were conducted. We are also grateful for the consideration and input of two anonymous reviewers.

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Correspondence to Anthony Amend.

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Amend, A., Garbelotto, M., Fang, Z. et al. Isolation by landscape in populations of a prized edible mushroom Tricholoma matsutake . Conserv Genet 11, 795–802 (2010). https://doi.org/10.1007/s10592-009-9894-0

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