Decoupling a novel Trichormus variabilis-Synechocystis sp. interaction to boost phycoremediation

Scientific Reports
Sepideh AbediStephen Chivasa

Abstract

To conserve freshwater resources, domestic and industrial wastewater is recycled. Algal systems have emerged as an efficient, low-cost option for treatment (phycoremediation) of nutrient-rich wastewater and environmental protection. However, industrial wastewater may contain growth inhibitory compounds precluding algal use in phycoremediation. Therefore, extremophyte strains, which thrive in hostile environments, are sought-after. Here, we isolated such an alga - a strain of Synechocystis sp. we found to be capable of switching from commensal exploitation of the nitrogen-fixing Trichormus variabilis, for survival in nitrogen-deficient environments, to free-living growth in nitrate abundance. In nitrogen depletion, the cells are tethered to polysaccharide capsules of T. variabilis using nanotubular structures, presumably for nitrate acquisition. The composite culture failed to establish in industrial/domestic waste effluent. However, gradual exposure to increasing wastewater strength over time untethered Synechocystis cells and killed off T. variabilis. This switched the culture to a stress-acclimated monoculture of Synechocystis sp., which rapidly grew and flourished in wastewater, with ammonium and phosphate removal efficienci...Continue Reading

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Citations

May 6, 2019·World Journal of Microbiology & Biotechnology·El-Sayed SalamaByong-Hun Jeon
Nov 17, 2020·Frontiers in Bioengineering and Biotechnology·Laura Ellen Walls, Leonardo Rios-Solis
Jun 14, 2021·Bioresource Technology·Anil Kumar PatelCheng Di Dong

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Methods Mentioned

BETA
light microscopy
ICE
PCR

Software Mentioned

Sequetech
BLAST
LALIGN
BLASTN

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