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Abstract - Issue Jul 2017, 38 (4) Back
nstantaneous and historical temperature effects on a-pinene
of salinity variations on exocellular polysaccharide production, biofilm
formation and flocculation in halotolerant bacteria
Hong1, M.M Joe1,3, G. Selvakumar1, K.Y. Kim1,
J.H. Choi2 and T.M. Sa1*?
Environmental and Biological Chemistry, Chungbuk National University,
Cheongju, Chungbuk, 361 763, Republic of Korea
2Department of Food
Science and Biotechnology, Wonkwang University, Iksan, 54538, Korea
Microbiology, School of Life Sciences, VELS University, Chennai-600 117,
Author E-mail: email@example.com
received : 04.03.2016
received : 14.11.2016
Accepted : 22.12.2016
Aim: The present study
was carried out to evaluate the exopolysaccharide (EPS) production, biofilm
formation and flocculation in four halotolerant plant growth promoting (PGP)
bacterial strains i.e., Brevibacterium iodinum RS16, Micrococcus
yunnanensis RS222, Bacillus aryabhattai RS341, B. licheniformis
RS656 under different salt levels.
halotolerant plant growth promoting bacterial strains namely B. iodinum
RS16, M. yunnanensis RS222, B. aryabhattai RS341 and B.
licheniformis RS656 were studied for their exopolysaccharide (EPS)
production, biofilm formation and flocculation efficiency under different
NaCl levels. EPS production of halotolerant plant growth promoting strains
was quantified in terms of dry weight and glucose content. Biofilm formation
of the plant growth promoting halotolerant strains was quantified based on a
micro titer plate assay. Plant growth-promoting efficiency of halotolerant
strains was quantified in red pepper plants in terms of vigor index and fresh
the strains, strain B. aryabhattai RS341 recorded the highest EPS dry
weight (5.80 g l-1), while the highest floc yield (0.60 g l-1
dry weight) was recorded by B. licheniformis RS656 at 2 mM NaCl
concentration. Regression analysis revealed that EPS content, expressed in
terms of dry weight, and flocculation in terms of floc yield, correlated
positively with NaCl levels. The highest biofilm formation in Canola root
surfaces was observed in the strain B. iodinum RS16 in all NaCl
concentrations. All the halotolerant strains promoted plant growth as
evidenced by the increased vigor index and fresh weight irrespective of the
level of NaCl.
was observed that halotolerant bacterial strains were able to promote plant
growth in the presence of NaCl through the mechanisms of EPS production,
flocculation and biofilm formations.?????? ??????????
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