Conservation Genetics

, Volume 11, Issue 3, pp 795–802

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

  • Anthony Amend
  • Matteo Garbelotto
  • Zhendong Fang
  • Sterling Keeley
Research Article

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.

Keywords

Matsutake Population structure Isolation by distance Ectomycorrhiza Eastern Himalaya Landscape genetics 

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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • Anthony Amend
    • 1
  • Matteo Garbelotto
    • 2
  • Zhendong Fang
    • 3
  • Sterling Keeley
    • 4
  1. 1.Department of Plant and Microbial BiologyUniversity of California BerkeleyBerkeleyUSA
  2. 2.Department of Environmental ScienceUniversity of California Berkeley, Policy and ManagementBerkeleyUSA
  3. 3.Shangri-La Alpine Botanical GardenDiqing PrefectureChina
  4. 4.Department of BotanyUniversity of Hawaii at ManoaHonoluluUSA

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