Research Square (Research Square), Год журнала: 2024, Номер unknown

Опубликована: Сен. 17, 2024

In nutrient-limited high-elevation ecosystems, plants rely on arbuscular mycorrhizal (AM) fungi to provide mineral phosphorus (P) in the form of phosphate (PO₄^3-). AM gather these nutrients through associations with cycling bacteria (PCBs) that can mineralize PO₄^3- from organic matter or solubilize mineral-bound P. The influence climate and other soil factors PCB interactions how communities affect fungal growth P levels remains unclear. We collected montane meadows over a 1000 meter elevation gradient three mountains created dataset shotgun metagenomes, marker genes, edaphic measurements. Soils at highest elevations had almost 50-fold lower 60% more hyphae than low-elevation soils. concentration pH influenced abundances taxonomically functionally diverse P-cycling exoenzyme including phosphatases, phospholipid turnover enzymes, genes for solubilization Actinobacteria, Acidobacteria, Proteobacteria were dominant PCBs, each correlated different functional guilds (rhizophilic, edaphophilic, ancestral). Our results argue an elevation-based trade-off microbial strategies. P-richer soils low elevations, microbiome is dominated by rhizophilic fungi, actinobacteria mineralizing phospholipids, less complex between PCBs fungi. P-scarser, weathered mountaintop favored ancestral mineral-associated fungal-PCB network. With continued warming, structure function ecosystems might shift resemble those elevations. This could disrupt long-established interactions, reducing prevalence groups, consequences both metabolic pathways produce total available plant communities.

Язык: Английский