In search of the pH limit of growth in halo-alkaliphilic cyanobacteria.
Environ Microbiol Rep
; 16(4): e13323, 2024 Aug.
Article
in En
| MEDLINE
| ID: mdl-39128846
ABSTRACT
Cyanobacteria have many biotechnological applications. Increasing their cultivation pH can assist in capturing carbon dioxide and avoiding invasion by other organisms. However, alkaline media may have adverse effects on cyanobacteria, such as reducing the Carbon-Concentrating Mechanism's efficiency. Here, we cultivated two halo-alkaliphilic cyanobacteria consortia in chemostats at pH 10.2-11.4. One consortium was dominated by Ca. Sodalinema alkaliphilum, the other by a species of Nodosilinea. These two cyanobacteria dominate natural communities in Canadian and Asian alkaline soda lakes. We show that increasing the pH decreased biomass yield. This decrease was caused, in part, by a dramatic increase in carbon transfer to heterotrophs. At pH 11.4, cyanobacterial growth became limited by bicarbonate uptake, which was mainly ATP dependent. In parallel, the higher the pH, the more sensitive cyanobacteria became to light, resulting in photoinhibition and upregulation of DNA repair systems.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Lakes
/
Cyanobacteria
Country/Region as subject:
America do norte
Language:
En
Journal:
Environ Microbiol Rep
Year:
2024
Document type:
Article
Affiliation country: