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Growth Promotion of Pavlova viridis by Bacteria Isolated from the Microalga
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  • Journal title : Journal of Life Science
  • Volume 25, Issue 5,  2015, pp.568-576
  • Publisher : Korean Society of Life Science
  • DOI : 10.5352/JLS.2015.25.5.568
 Title & Authors
Growth Promotion of Pavlova viridis by Bacteria Isolated from the Microalga
Ahamed, Sarker Anowarul Kabir; Kim, Jin-Joo; Choi, Tae-O; Choi, Tae-Jin;
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The marine microalga Pavlova viridis can grow fast and has the ability to accumulate essential nutrients for culturing marine animals, such as EPA and DHA, and it has been used as food for raring larval fish and prawn. The symbiotic relationship between the flagellate microalga Pavlova viridis and its associated bacteria was investigated. An axenic culture of P. viridis was obtained by repeated treatment of the microalga with an antibiotic cocktail. The axenic status was confirmed after sub-culturing three times in a sterile f/2 medium without an antibiotic. The axenic alga was then co-inoculated with five bacteria, arbitrarily designated as I1–I5, isolated from the alga to test the growth promotion of the algae. All bacterial strains promoted the growth of P. viridis, and bacterial isolate I3 was the most effective among the five bacteria tested. The cell number of P. viridis in the co-culture with I3 was significantly higher than that of the control culture. A sequence analysis of the 16S rRNA gene isolated from I3 revealed a 97% nucleotide sequence similarity to that of Citrobacter sp. The growth of strain I3 was also significantly enhanced by co-culturing with P. viridis, indicating a symbiotic relationship between the microalga and its associated bacterium. The association between the microalga and bacterium was confirmed by scanning electron microscopy.
Aaxenic;Citrobacter sp.;coculture;Pavlova viridis;symbiosis;
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