Plant-type shape arbuscular mycorrhizal fungal community assembly formation in rhizospheric microbiome of long-term heavy metal-stressed ultramafic soil

Le résumé fourni par la source

Serpentine root-associated soil (RAS) is among the most edaphically constrained microenvironment, characterized by extremely high heavy metal (HM) contents, low nutrient availability, and harsh physicochemical conditions. This study investigated how serpentine soil properties and serpentine-adapted plants influence the structure and function of arbuscular mycorrhizal fungal (AMF) communities in RAS. High-throughput sequencing results revealed that both plant type and soil chemistry significantly shaped AMF assemblages. Serpentine-adapted plants favored HM-tolerant AMF taxa such as Rhizophagus arabicus , Gigaspora rosea , and Geosiphon pyriformis , while non-serpentine counterparts were enriched in nutrient-responsive species, including Claroideoglomus etunicatum , Acaulospora scrobiculata , and Septoglomus viscosum . Specific AMF species exhibited strong correlations with distinct HMs and nutrient levels. For instance, higher concentrations of Zn and Pb in the RAS of Pueraria montana favored the enrichment of R. arabicus and G. pyriformis , while Cr and Ni levels in the RAS of Bidens pilosa increased the abundance of G. rosea . Functional guild analysis showed enrichment of symbiotrophic root endophytic AMF, with G. pyriformis as a lichenized/ Nostoc endosymbiont in serpentine conditions. Notably, serpentine-native plants reassembled their AMF community more selectively than their counterparts in the non-serpentine site. In serpentine RASs, AMF assemblages were primarily shaped by soil pH and electrical conductivity (EC), whereas temperature and moisture content (MC) strongly influenced AMF structure in non-serpentine RASs. The findings underscore the combined influence of plant type and soil properties on AMF community structure under HM-stressed ultramafic conditions.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.