Research

Scientific Transactions in Environment and Technovation Journal(STET), 07 Nov 2018 | 10.20894/STET.116.011.002.001
Year : 2017 | Volume: 11 | Issue: 2 | Pages : 59-68

Screening of plant growth promoting potential of salt tolerant rhizobacteria isolated from halophytes of Thiruvanmiyur beach, Tamil Nadu.

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The use of soil rhizosphere bacteria possessing the traits of plant growth promotion under saline stress is becoming
prevalent worldwide to achieve sustainable agriculture along with soil reclamation through phytoremediation as well
as bioremediation. A detailed study of the natural population in the rhizosphere of three halophytes grown in saline
soils was carried out to isolate and identify salt tolerant bacteria that could express plant growth promotion (PGP)
traits at high salt concentrations. In the present study, 15 bacteria were isolated from the rhizosphere of halophytes
grown in beach soils. Majority of the bacterial isolates were identified as Vibrio sp, Bacillus sp and Pseudomonas sp based
on biochemical and morphological observations. The pH and electrical conductivity of the soil were found to be 8 and
6.7 dS m-1 respectively. Out of the 15 bacteria isolated from saline rhizospheres, six isolates showed tolerance to high
salt concentration (12.5% NaCl). The potential salt tolerant bacterial isolates were further analyzed for the sodium
uptake pattern which showed successive increase in the amount of sodium uptake pattern from 0.1M concentration up
to 3M concentration of NaCl. The selected PGPR in this study were adapted to 12.5% NaCl stress and were able to
produce IAA, ammonia, HCN, amylase and protease. They also exhibited the ability of phosphate solubilization and
nitrogen fixation which would help plants to sequester inorganic phosphate available in the soil and to fix atmospheric
nitrogen. The data represented here is quite encouraging to use these PGPR for enhancing plant growth under saline
stress conditions..

Keywords: Plant Growth Promoting Rhizobacteria, Halophytes, NaCl, Rhizosphere

Citation: *, ( 2017), Screening of plant growth promoting potential of salt tolerant rhizobacteria isolated from halophytes of Thiruvanmiyur beach, Tamil Nadu.. Scientific Transactions in Environment and Technovation Journal(STET), 11(2): 59-68

Received: 01/04/2017; Accepted: 10/04/2017;
Published: 11/07/2018

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