Influence of NaCl on photosynthesis and nitrogen metabolism of cyanobacterium Nostoc calcicola

Nostoc calcicola, a halotolerant alkaliphilic, nitrogen-fixing cyanobacterium, was grown under various NaCl concentrations (from 500 to 2000 mM) at alkaline pH. In cyanobacteria, physiological and biochemical responses were correlated with the external salt stress. The optimal condition for cell gro...

Full description

Saved in:
Bibliographic Details
Published in:Applied biochemistry and microbiology 2015-11, Vol.51 (6), p.720-725
Main Authors: Singh, V, Pandey, K. D, Mesapogu, S, Singh, D. V
Format: Article
Language:English
Subjects:
Abiotic stress
Bacteria
Biochemistry
Biomedical and Life Sciences
carbohydrate content
Carbohydrates
cell growth
Cyanobacteria
glutamate-ammonia ligase
glutamine synthetase
Life Sciences
Medical Microbiology
Metabolism
Microbiology
nitrate reductase
Nitrogen
Nitrogen fixation
nitrogen metabolism
nitrogen-fixing cyanobacteria
Nostoc calcicola
oxygen
Photosynthesis
photosystem I
photosystem II
Salt
salt stress
Salt tolerance
Sodium chloride
soil
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Nostoc calcicola, a halotolerant alkaliphilic, nitrogen-fixing cyanobacterium, was grown under various NaCl concentrations (from 500 to 2000 mM) at alkaline pH. In cyanobacteria, physiological and biochemical responses were correlated with the external salt stress. The optimal condition for cell growth of N. calcicola isolated from alkaline ‘Usar’ soils of northern India was 500 mM NaCl at pH 10.5, accompanied with an increase in photosynthetic O₂ evolution, carbohydrate content and activities of nitrate reductase, glutamine synthetase, photosystem I and photosystem II. Under salt stress conditions above 500 mM NaCl, cell growth and carbohydrate contents reduced. The results indicate that production of carbohydrates under salinity stress at alkaline pH acts as major mechanism of salt tolerance in cyanobacteria.
ISSN:0003-6838
1608-3024
DOI:10.1134/S0003683815060149