Alpine plant roots and leaves host surprisingly picky microbial partners
Pan TY, Liu YJ, Sun HM, Yang ZL, Feng B
Mycorrhizal Networks
The mossy alpine meadows you might hike through are running on underground fungal networks so specific that even closely related plant species refuse to share the same fungal partners, a clue for anyone restoring native habitat or wondering why transplanted plants struggle without their old soil community.
Researchers dug up roots and sampled leaves from wild plants growing high on the Tibetan Plateau to see which fungi and bacteria live on and in them. They found that roots and leaves host completely different microbial neighborhoods, and surprisingly, plants that are supposed to be flexible about which mycorrhizal fungi they team up with actually turned out to be picky, favoring specific fungal partners based on their species and mycorrhizal type. Bacteria, on the other hand, moved more freely between leaves and roots, while fungi turned out to be the key connectors holding these microbial communities together.
Key Findings
Roots were dominated by symbiotrophic (mutualistic) fungi while phyllospheres (leaf surfaces) were dominated by saprotrophic (decomposer) fungi, with each compartment hosting distinct beneficial bacteria groups
Plants with different mycorrhizal types, and even different species within the same type (especially ectomycorrhizal plants), harbored distinct mycorrhizal fungi and dark septate endophytes, contradicting prior assumptions of low host specificity
Bacteria showed broader niche breadth and more cross-compartment sharing between roots and leaves, whereas fungi showed higher network connectivity and more often served as keystone species in microbial co-occurrence networks
chevron_right Technical Summary
Scientists found that alpine plants on the Tibetan Plateau host very different communities of fungi and bacteria depending on which part of the plant (roots vs. leaves) and what type of mycorrhizal partnership the plant has, challenging the idea that these fungal partners are generalists.
Abstract Preview
Original paper
Plant-associated microbial communities vary across compartments, mycorrhizal types, and species identities in alpine meadows of the Qinghai-Tibetan Plateau.
Plant-microbe symbioses can enhance plant adaptability. However, whether root-associated microbes form specific associations with plants of different mycorrhizal types remains controversial. Furthe...
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