Diversity Of Culturable Alkaliphilic Denitrifying Bacteria In Four Soda Lakes Of Ethiopia

Denitrifying bacteria (95 in number) were isolated from the four Soda Lakes of Ethiopiarnnamely, Lake Abijata, Lake Arenguade, Lake Chitu and Lake Shalla. Similar species ofrndenitrifying bacteria were identified from the four lakes. The sequence and phylogeny relationrnof the isolates show that Halomonas campisalis, Halomonas salina, Halomonas nitritophilus,rnBacillus cohnii as well as Bacillus pseudofirmus exhibited high similarities with the isolatesrnstudied. In addition, 9 isolates from the four lakes show similarity with the novel bacterialrngroup, Nitricola lacisaponesis. Fast denitrifyers were among the isolates that are capable ofrnproducing N2 gas only in 2 hours after inoculation. Molecular, morphological and somernbiochemical studies conducted on the DN-C18 isolate from L. Chitu, showed high similarityrnon all accounts with previously obtained isolate BACC180 from L. Chitu. These two isolatesrnshowed high denitrification activity and tolerance to high pH and salt concentration. Bothrnisolates were found to be closely related the Halomonas sp.rnKey words: denitrification; alkaliphilic denitrifiers; soda lakes; Lake Abijata; LakernArenguade; Lake Chitu; Lake Shalla; Halomonas; Bacillus; Nitricola lacisaponesis

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