Abstract
Aim: This research aimed to evaluate three Cr(VI)-resistant rhizosphere bacteria (Bacillus cereus, Bacillus aerius and Exiguobacterium profundum) for their ability to produce plant growth-promoting (PGP) substances and to remove Cr(VI). Methodology: Three rhizosphere bacteria were characterized for their ability to produce several PGP substances, including ammonia and indole-3-acetic acid (IAA) and solubilized phosphate. The Cr(VI) reduction ability of the rhizosphere bacteria was determined by diphenylcarbazide method with 60 mg l-1 Cr(VI). Results: Bioreduction of Cr(VI) in the reduction media by B. cereus was 13.7%, which was higher compared with those of B. aerius (4.4%) and E. profundum (3.6%). B. aerius adsorbed high Cr(VI) concentration of 56.1 mg g-1. The best condition for these rhizobacteria to remove or adsorb Cr(VI) was at acidic pH (5.36-5.97). All rhizobacteria could not stand the toxic effect of Cr(VI) at 60 mg l-1, which decreased almost 100% of rhizobacteria growth. B. cereus and B. aerius produced PGP substances, including ammonia and IAA and solubilized phosphate. Interpretation: B. cereus and B. aerius with high PGP activities can be considered promising agents in microbe-assisted phytoremediation. All rhizosphere bacteria tolerated Cr(VI) and protected plants against the inhibitory effect of Cr(VI) by reducing Cr(VI) to Cr(III) and assisting the plant uptake of Cr(III).
| Original language | English |
|---|---|
| Pages (from-to) | 427-433 |
| Number of pages | 7 |
| Journal | Journal of Environmental Biology |
| Volume | 40 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 1 Jan 2019 |
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Keywords
- Bioreduction
- Hexavalent chromium
- Plant growth-promoting rhizobacteria
- Rhizobacteria
- Scirpus grossus
ASJC Scopus subject areas
- Environmental Engineering
- Toxicology
- Health, Toxicology and Mutagenesis
Cite this
Potential of hexavalent chromium-resistant rhizosphere bacteria in promoting plant growth and hexavalent chromium reduction. / Kamaruzzaman, Mohd A.; Sheikh Abdullah, Siti Rozaimah; Abu Hasan, Hassimi; Hassan, M.; Idris, Mushrifah; Ismail, Nur Izzati.
In: Journal of Environmental Biology, Vol. 40, No. 3, 01.01.2019, p. 427-433.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Potential of hexavalent chromium-resistant rhizosphere bacteria in promoting plant growth and hexavalent chromium reduction
AU - Kamaruzzaman, Mohd A.
AU - Sheikh Abdullah, Siti Rozaimah
AU - Abu Hasan, Hassimi
AU - Hassan, M.
AU - Idris, Mushrifah
AU - Ismail, Nur Izzati
PY - 2019/1/1
Y1 - 2019/1/1
N2 - Aim: This research aimed to evaluate three Cr(VI)-resistant rhizosphere bacteria (Bacillus cereus, Bacillus aerius and Exiguobacterium profundum) for their ability to produce plant growth-promoting (PGP) substances and to remove Cr(VI). Methodology: Three rhizosphere bacteria were characterized for their ability to produce several PGP substances, including ammonia and indole-3-acetic acid (IAA) and solubilized phosphate. The Cr(VI) reduction ability of the rhizosphere bacteria was determined by diphenylcarbazide method with 60 mg l-1 Cr(VI). Results: Bioreduction of Cr(VI) in the reduction media by B. cereus was 13.7%, which was higher compared with those of B. aerius (4.4%) and E. profundum (3.6%). B. aerius adsorbed high Cr(VI) concentration of 56.1 mg g-1. The best condition for these rhizobacteria to remove or adsorb Cr(VI) was at acidic pH (5.36-5.97). All rhizobacteria could not stand the toxic effect of Cr(VI) at 60 mg l-1, which decreased almost 100% of rhizobacteria growth. B. cereus and B. aerius produced PGP substances, including ammonia and IAA and solubilized phosphate. Interpretation: B. cereus and B. aerius with high PGP activities can be considered promising agents in microbe-assisted phytoremediation. All rhizosphere bacteria tolerated Cr(VI) and protected plants against the inhibitory effect of Cr(VI) by reducing Cr(VI) to Cr(III) and assisting the plant uptake of Cr(III).
AB - Aim: This research aimed to evaluate three Cr(VI)-resistant rhizosphere bacteria (Bacillus cereus, Bacillus aerius and Exiguobacterium profundum) for their ability to produce plant growth-promoting (PGP) substances and to remove Cr(VI). Methodology: Three rhizosphere bacteria were characterized for their ability to produce several PGP substances, including ammonia and indole-3-acetic acid (IAA) and solubilized phosphate. The Cr(VI) reduction ability of the rhizosphere bacteria was determined by diphenylcarbazide method with 60 mg l-1 Cr(VI). Results: Bioreduction of Cr(VI) in the reduction media by B. cereus was 13.7%, which was higher compared with those of B. aerius (4.4%) and E. profundum (3.6%). B. aerius adsorbed high Cr(VI) concentration of 56.1 mg g-1. The best condition for these rhizobacteria to remove or adsorb Cr(VI) was at acidic pH (5.36-5.97). All rhizobacteria could not stand the toxic effect of Cr(VI) at 60 mg l-1, which decreased almost 100% of rhizobacteria growth. B. cereus and B. aerius produced PGP substances, including ammonia and IAA and solubilized phosphate. Interpretation: B. cereus and B. aerius with high PGP activities can be considered promising agents in microbe-assisted phytoremediation. All rhizosphere bacteria tolerated Cr(VI) and protected plants against the inhibitory effect of Cr(VI) by reducing Cr(VI) to Cr(III) and assisting the plant uptake of Cr(III).
KW - Bioreduction
KW - Hexavalent chromium
KW - Plant growth-promoting rhizobacteria
KW - Rhizobacteria
KW - Scirpus grossus
UR - http://www.scopus.com/inward/record.url?scp=85069601725&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85069601725&partnerID=8YFLogxK
U2 - 10.22438/jeb/40/3(SI)/Sp-03
DO - 10.22438/jeb/40/3(SI)/Sp-03
M3 - Article
VL - 40
SP - 427
EP - 433
JO - Journal of Environmental Biology
JF - Journal of Environmental Biology
SN - 0254-8704
IS - 3
ER -