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Bhargava S.,Government Motilal Science College | Kaithwas V.,Government Motilal Science College | Maithil R.,Government Motilal Science College
Ecotoxicology and Environmental Safety | Year: 2013

To understand how carbon and nitrogen metabolism are regulated in diazotrophically and non-diazotrophically grown cultures of the cyanobacterium Nostoc muscorum, we investigated the role of bicarbonate (HCO3 -) in regulating diazotrophy and autotrophy. Results showed that HCO3 - concentration up to 12molm-3 enhanced growth, specific growth rate, photosynthetic pigments, photosynthetic O2 evolution and nitrogenase activity under diazotrophic growth conditions. The co-existence of different nitrogen sources in the growth medium further accelerate the examined parameters in the order of NO3 - Source

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