Growth assessment of cyanobacteria Anabaena Sp. FS 76 and Nostoc Sp. FS 77 affected by thermal shock condition

Abstract

Soil cyanobacteria Nostoc sp. FS 77 and Anabaena sp. FS 76 from the point of view to extreme constraints associated with light, carbon dioxide and cold shock, were evaluated. Samples were Prepared from algal museum of shahid Beheshti University and placed in vitro treatment limitations extreme light (2 micromoles quantum per square meter per second), carbon dioxide (non-inoculated carbon dioxide , non- aerated) temperature of 25°C and cold shock (00C) at different times (0.5, 2 , 4 , 6 , 8minutes). The results showed that the cyanobacteria are able to maintain their survival in cold shock treatments. In cyanobacteria Anabaena shocks cause a lag phase. In cyanobacteria Nostoc, behaviors were different related to thermal shocks and by contrast Anabaena within 6 minutes had negative growth the fifth day. The photoperiod shock eight minutes was not observed a significant difference in the carotenoid content. To achieve stability in the filament part of Phycobilisomes shocks have played a similar role in half and eight minutes. However, the system of will be affected in the short times. It appears that chlorophyll formation in relation to the time and thermal shock in these cyanobacteria varies depending on the species.

Keywords

• aAnabaena
• Nostoc
• habituation
• cyanobacteria
• thermal shock