Diversity of Culturable Alkaliphilic Denitrifying Bacteria in Four Soda Lakes of Ethiopia
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Date
2010-12
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Addis Ababa University
Abstract
Denitrifying bacteria (95 in number) were isolated from the four Soda Lakes of Ethiopia
namely, Lake Abijata, Lake Arenguade, Lake Chitu and Lake Shalla. Similar species of
denitrifying bacteria were identified from the four lakes. The sequence and phylogeny relation
of the isolates show that Halomonas campisalis, Halomonas salina, Halomonas nitritophilus,
Bacillus cohnii as well as Bacillus pseudofirmus exhibited high similarities with the isolates
studied. In addition, 9 isolates from the four lakes show similarity with the novel bacterial
group, Nitricola lacisaponesis. Fast denitrifyers were among the isolates that are capable of
producing N2 gas only in 2 hours after inoculation. Molecular, morphological and some
biochemical studies conducted on the DN-C18 isolate from L. Chitu, showed high similarity
on all accounts with previously obtained isolate BACC180 from L. Chitu. These two isolates
showed high denitrification activity and tolerance to high pH and salt concentration. Both
isolates were found to be closely related the Halomonas sp.
Key words: denitrification; alkaliphilic denitrifiers; soda lakes; Lake Abijata; Lake
Arenguade; Lake Chitu; Lake Shalla; Halomonas; Bacillus; Nitricola lacisaponesis
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Keywords
denitrification, alkaliphilic denitrifiers, soda lakes, Lake Abijata, Lake Arenguade, Lake Chitu, Lake Shalla, Halomonas, Bacillus, Nitricola lacisaponesis