Abstract
The goal of this study was to determine the effect of bispyribac-sodium on the nitrogenase activities and growth of cyanobacteria isolated from paddy fields. Ten cyanobacterialspecies were used in this study. Cyanobacterial species were isolated from soil and water samples obtained from rice fields in Corum, Turkey. Among all Anabaena strains, the maximum activity was determined in Anabaena sp. O-22 (2.26 µl ethylene/mg.h) whereas; the lowest activity was shown in Gloeothece sp. O-Y (0.04 µl ethylene/mg.h).The maximum inhibition was seen in Anabaena sp. O-22, Synechocystis sp. O-X andAnabaena sp. O-16 in 100 µg/ml bispyribac-sodium concentration. Although low bispyribac-sodium concentrations somewhat stimulated growths of Anabaena sp. O-X2, O-C, O-4, O-16, O-8 and Synechocystis sp. O-X, the biomass of all cultures were severely inhibited at higher concentrations. The growths of Anabaena sp. O-22 andSynechocystis sp. O-X completely repressed at 100 µg/mL and at higher bispyribac-sodium concentrations, whereas, Anabaena O-X2, O-6, O-4 and O-16 completely suppressed at 500 µg/mL bispyribac-sodium concentration. The end of the studyAnabaena sp. O-22 has been proposed as biofertilizer. The results obtained may be useful for the production of rice. Key words: Cyanobacteria, nitrogenase activity, herbicide.
Highlights
The utilization of nitrogen gas (N2) as a source of nitrogen is called nitrogen fixation and it is a property of only certain prokaryotes (Manahan, 1997; Madigan et al, 1997)
Cyanobacterial species were isolated from soil and water samples obtained from rice fields in Corum, Turkey
Among all Anabaena strains, the maximum activity was determined in Anabaena sp
Summary
The utilization of nitrogen gas (N2) as a source of nitrogen is called nitrogen fixation and it is a property of only certain prokaryotes (Manahan, 1997; Madigan et al, 1997). Phosphate, light intensity, metal, osmotic and herbicide stresses are important environmental conditions affecting algal growth and nitrogenase activity (Meeks et al, 1983; Castenholz, 1988; Lehtimaki et al, 1997; Liengen, 1999; Banerjee et al, 2004; Okmen and Donmez, 2007a; Okmen et al, 2007b; Okmen et al, 2007c). These effects depend on the type and nature of environmental conditions, the organisms present as well as the experimental conditions (Tozum and Sivaci, 1993)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
