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<p><i>Juniperus thurifera</i> L. subsp. <i>aurasiaca</i> is an endangered botanical relic , threatened by climate change and low seed germination rates. Mycorrhization may enhance plant resilience and is crucial for conservation strategies; however, the mycorrhizal status of this subspecies is not yet understood. This study characterizes the mycorrhizal community associated with <i>J. thurifera</i> subsp. <i>aurasiaca</i> to inform conservation efforts.</p><p>Fieldwork was conducted in, a semi-arid region with cold winters. Root samples were collected from 15 trees in September 2023, including 6 individuals under 40 years and 9 over 100 years old. For the first time, a dual mycorrhizal association featuring arbuscular mycorrhizal and ectomycorrhizal (ECM) with ectendomycorrhizal (EECM) subtypes was identified. Anatomical analyses distinguished 40 ECMs and 22 EECMs.</p><p>Older trees exhibited short-distance exploration strategies, while younger trees favored medium-distance exploration. Ectomycorrhizal (ECM) colonization rates were higher in younger individuals, particularly for short- and medium–long-distance exploration types. In contrast, arbuscular mycorrhizal (AM) colonization was more pronounced in older trees. The ECM/EECM was 1.6 in younger and 2.2 in older trees, indicating a greater abundance of ECMs in older individuals. Low diversity in both ECM and EECM communities was noted, alongside a dominance of arbuscular mycorrhizal colonization. These findings suggest that the dual mycorrhizal status may enhance the adaptability of <i>J. thurifera</i> under the extreme conditions.</p>

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Dual mycorrhizal symbiosis in the endemic Juniperus thurifera subsp aurasiaca

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月2日

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  • Nadjat Mezaour,
  • Saliha Kadi-Bennane,
  • Chafia Harchaoui-Bourenine,
  • Karim Houali,
  • El-hafid Nabti,
  • Nasir A. Ibrahim,
  • Mohammed Saad Aleissa,
  • Nosiba S Basher,
  • Assia Derguini,
  • Takfarinas Idres,
  • Djamila Adjoud-Sadadou

摘要

Juniperus thurifera L. subsp. aurasiaca is an endangered botanical relic , threatened by climate change and low seed germination rates. Mycorrhization may enhance plant resilience and is crucial for conservation strategies; however, the mycorrhizal status of this subspecies is not yet understood. This study characterizes the mycorrhizal community associated with J. thurifera subsp. aurasiaca to inform conservation efforts.

Fieldwork was conducted in, a semi-arid region with cold winters. Root samples were collected from 15 trees in September 2023, including 6 individuals under 40 years and 9 over 100 years old. For the first time, a dual mycorrhizal association featuring arbuscular mycorrhizal and ectomycorrhizal (ECM) with ectendomycorrhizal (EECM) subtypes was identified. Anatomical analyses distinguished 40 ECMs and 22 EECMs.

Older trees exhibited short-distance exploration strategies, while younger trees favored medium-distance exploration. Ectomycorrhizal (ECM) colonization rates were higher in younger individuals, particularly for short- and medium–long-distance exploration types. In contrast, arbuscular mycorrhizal (AM) colonization was more pronounced in older trees. The ECM/EECM was 1.6 in younger and 2.2 in older trees, indicating a greater abundance of ECMs in older individuals. Low diversity in both ECM and EECM communities was noted, alongside a dominance of arbuscular mycorrhizal colonization. These findings suggest that the dual mycorrhizal status may enhance the adaptability of J. thurifera under the extreme conditions.