TITLE:
Induced Accumulation of Polyphenolics and Flavonoids in Cyanobacteria under Salt Stress Protects Organisms through Enhanced Antioxidant Activity
AUTHORS:
Dhananjaya P. Singh, Ratna Prabha, Kamlesh K. Meena, Lalan Sharma, Arun K. Sharma
KEYWORDS:
Cyanobacteria; Phenylpropanoids; Flavonoids; Antioxidants; Stress Tolerance
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.5 No.5,
March
19,
2014
ABSTRACT: Induced accumulation of polyphenolics and
flavonoids in cyanobacterial strains grown under different salt concentrations
is correlated with their growth under stress conditions and enhanced
antioxidant activity. Plectonema boryanum, Hapalosiphon intricatus, Anabaena doliolum and Oscillatoria acuta grown for 21 days
under different salt concentrations (80, 160, 240, 320 and 400 mM) in BG11
medium showed differential growth responses in terms of biomass, total protein,
chlorophyll content, total content of polyphenol, flavonoid and carotenoid,
accumulation of phenolic acids (gallic, caffeic, chlorogenic, ferullic and
vanillic) and flavonoids (rutin and quercetin). Cyanobacterial extracts showed
prominent free radical scavenging antioxidant activity (AOA) in terms of % DPPH
discoloration. Highly significant (p