Physiological response mechanism of heavy metal-resistant endophytic fungi isolated from the roots of Polygonatum kingianum.

ABSTRACT: This study aims to evaluate the tolerance of endophytic fungi isolated from the fibrous roots of Polygonatum kingianum to arsenic (As) and cadmium (Cd) and their physiological response mechanisms. Five isolated strains were obtained with EC₅₀ values for As(V) ranging from 421 to 1281 mg/L, while the other three strains tolerated Cd(II) with an EC₅₀ range of 407-1112 mg/L. Morphological and molecular identification indicated that these eight strains were Cladosporium spp. belonging to dark septate endophytes (DSEs). The contents of metal ions in mycelium sharply increased, reaching 38.87 mg/kg for strain MZ-11 under As(V) stress and 0.33 mg/kg for fungus PR-2 under Cd(II). The physiological response revealed that the biomass decreased with increasing concentrations of

SUBMITTER: Cao GH 

PROVIDER: S-EPMC10667662 | biostudies-literature | 2023 Dec

REPOSITORIES: biostudies-literature