SALT-INDUCED EXOPOLYSACCHARIDE PRODUCTION IN AZOTOBACTER CHROOCOCCUM STRAINS UNDER NACL AND NA₂SO₄ STRESS CONDITIONS

Soliyeva, M.A., Rasulov, B.A.

Қўқон ДПИ. Илмий хабарлар · 2026-yil

Annotatsiya

Salinity is one of the major environmental factors limiting the growth and metabolic activity of beneficial soil microorganisms. The present study investigated the effects of NaCl and Na₂SO₄ on biomass accumulation and exopolysaccharide (EPS) production by Azotobacter chroococcum strains XH2018 and XH2020. The strains were cultivated in Ashby medium supplemented with 0.5%, 1.0%, and 2.0% concentrations of NaCl or Na₂SO₄. Biomass and EPS production were determined after cultivation under shaking conditions. The results showed that both strains were able to grow under salt stress; however, their responses varied depending on the salt type and concentration. Strain XH2020 generally produced higher biomass than strain XH2018 under most experimental conditions. The highest biomass values were recorded at 2% NaCl and 0.5% Na₂SO₄, reaching 6.2 g/L in strain XH2020. Salt stress also significantly influenced EPS biosynthesis. Under NaCl treatment, moderate increases in EPS production were observed in both strains. In contrast, Na₂SO₄ strongly stimulated EPS synthesis, particularly in strain XH2020. The highest EPS yield (15.0 g/L) was obtained at 2% Na₂SO₄, whereas the maximum EPS production by strain XH2018 was 4.4 g/L under the same conditions. These findings indicate that sulfate-induced salt stress enhances EPS production more effectively than NaCl and that strain XH2020 possesses superior adaptive mechanisms for coping with saline environments. The high EPS-producing capacity of strain XH2020 under Na₂SO₄ stress highlights its potential for agricultural and biotechnological applications in saline environments.

Maqola ma’lumotlari
MualliflarSoliyeva, M.A., Rasulov, B.A.
JurnalҚўқон ДПИ. Илмий хабарлар
Nashr sanasi2026-07-13
Jild8
Son6
Betlar580-586
TilIngliz
DOI10.70728/a.series.tab.v08.i06.079

DOI: 10.70728/a.series.tab.v08.i06.079 · Maqolaning asl sahifasi

Kalit so‘zlar

Azotobacter chroococcum, exopolysaccharides, EPS, salinity stress, NaCl, sodium sulfate, biomass production, alginate.

Ilmiy soha

ArxitekturaPedagogikaPsixologiyaSan’atshunoslik

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