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<p><i>Rhizopogon</i> species are important ectomycorrhizal (ECM) symbionts of <i>Pinaceae</i> and play a vital role in seedling establishment. Although nearly three hundred <i>Rhizopogon</i> species have been recorded globally, Asian taxa remain poorly characterized. This study reported the first confirmed occurrence of <i>Rhizopogon</i> in Vietnam and the first evidence of its ECM association with <i>Pinus kesiya</i>. Field surveys in <i>P. kesiya</i> forests of Lam Dong Province (Vietnam) yielded three basidiomata and a cluster of ECM root tips. Both morphological features and ITS-based phylogenetic analysis identified the basidiomata and ECM fungal partner as <i>Rhizopogon boninensis,</i> which was previously considered endemic to the southern islands of Japan. Amplicon sequencing of bulk soil samples further confirmed the presence of <i>R. boninensis</i> propagules in the local forest ground. The in vitro co-culture of <i>P. kesiya</i> seedlings with <i>R. boninensis</i> successfully produced ECM root tips. The ECM seedlings exhibited significantly enhanced height, dried biomass, and root development, respectively 1.7, 2.9, and 3 times compared with non-inoculated controls. These results extend the known distribution of <i>R. boninensis</i> and highlight its potential as a native-compatible bioinoculant to support <i>P. kesiya</i> propagation and reforestation across Southeast Asia.</p>

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Extended distribution of the ectomycorrhizal fungus Rhizopogon boninensis in tropical Asia and its verified growth-promoting effect on Pinus kesiya

  • 期刊论文

  • 发表日期：

    2026年5月14日

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  • Tram T. Ngo,
  • Nhan T. Le,
  • Quyen H. Dang,
  • Dung H. Nguyen,
  • Mai T. T. Duong,
  • Quyen B. T. Ho,
  • Lei Cai,
  • Hoang N. D. Pham

摘要

Rhizopogon species are important ectomycorrhizal (ECM) symbionts of Pinaceae and play a vital role in seedling establishment. Although nearly three hundred Rhizopogon species have been recorded globally, Asian taxa remain poorly characterized. This study reported the first confirmed occurrence of Rhizopogon in Vietnam and the first evidence of its ECM association with Pinus kesiya. Field surveys in P. kesiya forests of Lam Dong Province (Vietnam) yielded three basidiomata and a cluster of ECM root tips. Both morphological features and ITS-based phylogenetic analysis identified the basidiomata and ECM fungal partner as Rhizopogon boninensis, which was previously considered endemic to the southern islands of Japan. Amplicon sequencing of bulk soil samples further confirmed the presence of R. boninensis propagules in the local forest ground. The in vitro co-culture of P. kesiya seedlings with R. boninensis successfully produced ECM root tips. The ECM seedlings exhibited significantly enhanced height, dried biomass, and root development, respectively 1.7, 2.9, and 3 times compared with non-inoculated controls. These results extend the known distribution of R. boninensis and highlight its potential as a native-compatible bioinoculant to support P. kesiya propagation and reforestation across Southeast Asia.