This invention relates to the field of
microbiology and its application technology, specifically providing an adherent electroactive microalga with salt stress-responsive characteristics, biological agents, and applications. The microalga provided by this invention belongs to the
phylum Cyanobacteria, specifically *Desertifilum salkalinema* UJS-X-1, with accession number CGMCC No. 46959. This algal strain can adhere to and grow on
solid or semi-
solid substrates to form biofilms, exhibiting stable
extracellular electron transport capabilities, good salt and alkali tolerance, and a
dose-response relationship between its electroactivity and
salinity. It can significantly reduce the
salinity and pH of
saline-alkali soils, and under salt and alkali stress, it can promote
rice growth, increase its
biomass and
chlorophyll content, and reduce
malondialdehyde content. The algal strain provided by this invention can be used to prepare biological agents for
saline-alkali land remediation, construct microalgal
vegetation, serve as a
salinity-responsive biological indicator, as an
anode material for bio-batteries, and as a bio-
fertilizer for crops in
saline-alkali land, showing broad application prospects.