Analysis of Morphological and Ultrastructure Variation Patterns In Two Previously Unexplored Strains of Nostocaceae Collected From Paddy fields of Gorgan (Golestan Province)

In current research two strains of Nostocaceae (Anabaena sp.FS76 and Nostoc sp. FS77) collected from paddy fields of Golestan province were studied morphologically and ultrastraucturally using optical, phase contrast, fluerosence and TEM electron microscopy. Results showed that, in comparison between strains, Anabaena sp.FS76 showed considerable fluctuations in dimensions and shapes of cells in 3th day, it seems that spatial form of this specimen changes in this day. Compression of the aggregations in liquid culture medium, decreased sharp in 8th day and stay to the similar form until the end of duration. The specimen had interesting color changes from light brown to green-brown. Generally, the length of vegetative cells and spores is more than their diameter. Vegetative cells in Anabaena sp.FS76 showed interesting shape and size variations. Vegetative cell length was more than diameter from the first to 10th day but in 10th day to end of duration this turned to the opposite and kept permanently. It seems that shapes of the thylakoides in ultrastructure analysis was not so changeable during the days and kept the relatively dense to linear configuration. In Nostoc sp.FS77, carboxysome and phosphate granules showed more various shapes in comparison with Anabaena sp. FS76.