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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP
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    Abstract - Issue Sep 2020, 41 (5)                                     Back


nstantaneous and historical temperature effects on a-pinene

Mutualistic interactions of green microalga Chlorella sp. with bacterial quorum sensing degrader Bacillus spp isolated from biofloc and freswater prawn Macrobrachium rosenbergii 

 

A.G. Nurarina1, H. Aini2, L.H. Ying2, I. Ahmad2 and I. Natrah*1,2 

1Laboratory of Marine Biotechnology, Institute of Bioscience, University Putra Malaysia, Serdang-43400, Selangor, Malaysia

2Laboratory of Sustainable Aquaculture, International Institute of Aquaculture and Aquatic Science, Universiti Putra Malaysia, Serdang-43400, Selangor, Malaysia

*Corresponding Author Email : natrah@upm.edu.my

Paper received: 17.09.2019 ?????? ???????????????????????????????????????Revised received: 10.01.2020 ???????????? ??????????????????????Accepted: 14.08.2020

 

Abstract

Aim: Bacterial quorum sensing degrader isolated from biofloc and giant freshwater prawn, Macrobrachium rosenbergii were investigated for mutual interaction with green microalga, Chlorella sp. for potential use of disease control in aquatic environment.

Methodology: Two potential strains of quorum sensing (QS) degrader were successfully isolated from biofloc and giant freshwater prawn, Macrobrachium rosenbergii. Meanwhile, Chlorella sp. was made axenic using 13 to 500 ppm of different antibiotic mixtures (chloramphenicol, tetracycline, enrofloxacin, kanamycin, and neomycin), where interaction of algae with different QS degrader strains, different microbial communities and pathogenic bacterium Aeromonas hydrophila were investigated.            

Results: The QS degrader strains were identified as Bacillus subtilis, BP-BFT/1b and Bacillus cereus, BP-MBRG/1b. Growth of Chlorella sp. added with Bacillus subtilis, BP-BFT/1b was higher compared to Bacillus cereus, BP-MBRG/1b. The results showed that the growth of axenic Chlorella sp. improved in the presence of bacteria, including bacterial QS degraders.      

Interpretation: There is a potential to incorporate both B. subtilis BPBFT/1b and B. cereus BPMBRG/1b in aquaculture systems to overcome invasion of pathogenic bacteria using bacterial QS degrading mechanism.       

Key words: Bacterial Quorum sensing, Biofloc, Green microalgae, Macro brachium rosenbergii

 

 

 

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