Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Nickel phytoextraction through bacterial inoculation in Raphanus sativus
AU - Akhtar, Muhammad Javed
AU - Ullah, Sana
AU - Ahmad, Iftikhar
AU - Rauf, Abdul
AU - Nadeem, Sajid Mahmood
AU - Khan, Muhammad Yahya
AU - Hussain, Sabir
AU - Bulgariu, Laura
PY - 2018/1/1
Y1 - 2018/1/1
N2 - A pot experiment was conducted to evaluate the potential of two plant growth promoting rhizobacteria (PGPR) viz. Bacillus sp. CIK-516 and Stenotrophomonas sp. CIK-517Y for improving the growth and Ni uptake of radish (Raphanus sativus) in the presence of four different levels of Ni contamination (0, 50, 100, 150 mg Ni kg−1 soil). Plant growth, dry biomass, chlorophyll and nitrogen contents were significantly reduced by the exogenous application of Ni, however, bacterial inoculation diluted the negative impacts of Ni stress on radish by improving these parameters. PGPR strain CIK-516 increased root length (9–27%), shoot length (8–27%), root dry biomass (2–32%), shoot dry biomass (9–51%), root girth (6–48%), total chlorophyll (4–38%) and shoot nitrogen contents (11–15%) in Ni contaminated and non-contaminated soils. Positive regulation of chlorophyll and nitrogen contents by the inoculated plants shows plant tolerance mechanism of Ni stress. Bacterial strain (CIK-516) exhibited indole acetic acid and 1-amino-cyclopropane-1-carboxylate deaminase potentials which would have helped radish plant to stabilize in Ni contaminated soil and thereby increased Ni uptake (24–257 in shoot and 58–609 in root mg kg−1 dry biomass) and facilitated accumulation in radish (bioaccumulation factor = 0.6–1.7) depending upon soil Ni contamination. Based on the findings of this study, it might be suggested that inoculation with bacterial strain CIK-516 could be an efficient tool for enhanced Ni phytoextraction in radish.
AB - A pot experiment was conducted to evaluate the potential of two plant growth promoting rhizobacteria (PGPR) viz. Bacillus sp. CIK-516 and Stenotrophomonas sp. CIK-517Y for improving the growth and Ni uptake of radish (Raphanus sativus) in the presence of four different levels of Ni contamination (0, 50, 100, 150 mg Ni kg−1 soil). Plant growth, dry biomass, chlorophyll and nitrogen contents were significantly reduced by the exogenous application of Ni, however, bacterial inoculation diluted the negative impacts of Ni stress on radish by improving these parameters. PGPR strain CIK-516 increased root length (9–27%), shoot length (8–27%), root dry biomass (2–32%), shoot dry biomass (9–51%), root girth (6–48%), total chlorophyll (4–38%) and shoot nitrogen contents (11–15%) in Ni contaminated and non-contaminated soils. Positive regulation of chlorophyll and nitrogen contents by the inoculated plants shows plant tolerance mechanism of Ni stress. Bacterial strain (CIK-516) exhibited indole acetic acid and 1-amino-cyclopropane-1-carboxylate deaminase potentials which would have helped radish plant to stabilize in Ni contaminated soil and thereby increased Ni uptake (24–257 in shoot and 58–609 in root mg kg−1 dry biomass) and facilitated accumulation in radish (bioaccumulation factor = 0.6–1.7) depending upon soil Ni contamination. Based on the findings of this study, it might be suggested that inoculation with bacterial strain CIK-516 could be an efficient tool for enhanced Ni phytoextraction in radish.
KW - Bioaugmentation
KW - Heavy metals
KW - Physiology
KW - Phytoremediation
KW - Plant growth
KW - Radish
U2 - 10.1016/j.chemosphere.2017.09.136
DO - 10.1016/j.chemosphere.2017.09.136
M3 - Journal article
VL - 190
SP - 234
EP - 242
JO - Chemosphere
JF - Chemosphere
SN - 0045-6535
ER -