Abd El-AAl, A. (2013). CHARACTERIZATION OF ANABAENA AZOLLAE ISOLATED FROM AZOLLA PINNATA. Egyptian Journal of Agricultural Research, 91(3), 801-809. doi: 10.21608/ejar.2013.164847
Azza A.M. Abd El-AAl. "CHARACTERIZATION OF ANABAENA AZOLLAE ISOLATED FROM AZOLLA PINNATA". Egyptian Journal of Agricultural Research, 91, 3, 2013, 801-809. doi: 10.21608/ejar.2013.164847
Abd El-AAl, A. (2013). 'CHARACTERIZATION OF ANABAENA AZOLLAE ISOLATED FROM AZOLLA PINNATA', Egyptian Journal of Agricultural Research, 91(3), pp. 801-809. doi: 10.21608/ejar.2013.164847
Abd El-AAl, A. CHARACTERIZATION OF ANABAENA AZOLLAE ISOLATED FROM AZOLLA PINNATA. Egyptian Journal of Agricultural Research, 2013; 91(3): 801-809. doi: 10.21608/ejar.2013.164847
CHARACTERIZATION OF ANABAENA AZOLLAE ISOLATED FROM AZOLLA PINNATA
Soils, Water and Environment Research Institute, Agricultural Research Center, Giza, Egypt
Abstract
A symbiotically associated cyanobacterium (Anabaena azollae) was isolated from Azolla pinnata and cultured under a free-living state. It is characterized by filamentous brown to olive in color culture, its vegetative cells are cylindrical and their diameters ranged from 8 to 9µm width and from 5 to 6 µm length. Heterocysts were found to be internal and terminal in the filament, its shape is spherical and its diameters ranged from 9 to 9.5 µm width and from 9 to 9.5 µm length. Akintes are present with cylindrical shape, with diameters of 9-10 µm width and 6-8 µm length. Nitrogenase activity of Anabaena azollae increased gradually from 0.1786 to 4.7992 μ mole C2H4 g soil/hr along 4 weeks. The strain showed high efficacy in suppressing the fungal mycelial growth of either Fusarium oxysporum or Alternaria alternate by 100 %.