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Influence of metal resistant-plant growth-promoting bacteria on the growth of Ricinus communis in soil contaminated with heavy metals.
Chemosphere. 2008 Mar; 71(5):834-42.C

Abstract

The metal resistant-plant growth-promoting bacterial (PGPB) strains PsM6 and PjM15 isolated from a serpentine soil were characterized as Pseudomonas sp. and Pseudomonas jessenii, respectively, on the basis of their morphological, physiological, biochemical characteristics and 16S rDNA sequences. Assessment of plant growth-promoting parameters revealed the intrinsic ability of the strains for the utilization of 1-aminocyclopropane-1-carboxylic acid as the sole N source, solubilization of insoluble phosphate and production of indole-3-acetic acid (IAA). Further, a pot experiment was conducted to elucidate the effects of inoculating metal resistant PGPB on the plant growth and the uptake of Ni, Cu and Zn by Ricinus communis. Inoculation of Pseudomonas sp. PsM6 or P. jessenii PjM15 increased the shoot and root biomass of R. communis grown in non-contaminated and contaminated soil. However, the maximum biomass was observed in the plants inoculated with strain PjM15. This effect can be attributed to the solubilization of phosphate and production of IAA. Inoculation of Pseudomonas sp. PsM6 and PjM15 did not greatly alter the organ metal concentrations except Zn which concentration was higher in root, stem and leaf of inoculated plants. The results of metal extraction with PGPB strains showed that PsM6 was more efficient at solubilizing Zn than PjM15, and that PjM15 was better at solubilising Ni and Cu than PsM6. Owing to its wide action spectrum, the metal resistant PGPB could serve as an effective metal sequestering and growth-promoting bioinoculant for plants in metal-stressed soil. The present study has provided a new insight into the phytoremediation of metal-contaminated soil.

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Publisher Full Text (DOI)

Authors+Show Affiliations

Rajkumar M
Centre for Functional Ecology, Department of Botany, University of Coimbra, Coimbra 3000-455, Portugal. mraaj13@yahoo.com
Freitas H
No affiliation info available

MeSH

AbsorptionBase SequenceDNA PrimersMetals, HeavyMolecular Sequence DataPortugalPseudomonasRNA, Ribosomal, 16SRicinusSequence Analysis, DNASoil MicrobiologySoil Pollutants

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

18164365

Citation

Rajkumar, Mani, and Helena Freitas. "Influence of Metal Resistant-plant Growth-promoting Bacteria On the Growth of Ricinus Communis in Soil Contaminated With Heavy Metals." Chemosphere, vol. 71, no. 5, 2008, pp. 834-42.
Rajkumar M, Freitas H. Influence of metal resistant-plant growth-promoting bacteria on the growth of Ricinus communis in soil contaminated with heavy metals. Chemosphere. 2008;71(5):834-42.
Rajkumar, M., & Freitas, H. (2008). Influence of metal resistant-plant growth-promoting bacteria on the growth of Ricinus communis in soil contaminated with heavy metals. Chemosphere, 71(5), 834-42. https://doi.org/10.1016/j.chemosphere.2007.11.038
Rajkumar M, Freitas H. Influence of Metal Resistant-plant Growth-promoting Bacteria On the Growth of Ricinus Communis in Soil Contaminated With Heavy Metals. Chemosphere. 2008;71(5):834-42. PubMed PMID: 18164365.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Influence of metal resistant-plant growth-promoting bacteria on the growth of Ricinus communis in soil contaminated with heavy metals. AU - Rajkumar,Mani, AU - Freitas,Helena, Y1 - 2008/01/15/ PY - 2007/08/17/received PY - 2007/11/13/revised PY - 2007/11/16/accepted PY - 2008/1/1/pubmed PY - 2008/7/18/medline PY - 2008/1/1/entrez SP - 834 EP - 42 JF - Chemosphere JO - Chemosphere VL - 71 IS - 5 N2 - The metal resistant-plant growth-promoting bacterial (PGPB) strains PsM6 and PjM15 isolated from a serpentine soil were characterized as Pseudomonas sp. and Pseudomonas jessenii, respectively, on the basis of their morphological, physiological, biochemical characteristics and 16S rDNA sequences. Assessment of plant growth-promoting parameters revealed the intrinsic ability of the strains for the utilization of 1-aminocyclopropane-1-carboxylic acid as the sole N source, solubilization of insoluble phosphate and production of indole-3-acetic acid (IAA). Further, a pot experiment was conducted to elucidate the effects of inoculating metal resistant PGPB on the plant growth and the uptake of Ni, Cu and Zn by Ricinus communis. Inoculation of Pseudomonas sp. PsM6 or P. jessenii PjM15 increased the shoot and root biomass of R. communis grown in non-contaminated and contaminated soil. However, the maximum biomass was observed in the plants inoculated with strain PjM15. This effect can be attributed to the solubilization of phosphate and production of IAA. Inoculation of Pseudomonas sp. PsM6 and PjM15 did not greatly alter the organ metal concentrations except Zn which concentration was higher in root, stem and leaf of inoculated plants. The results of metal extraction with PGPB strains showed that PsM6 was more efficient at solubilizing Zn than PjM15, and that PjM15 was better at solubilising Ni and Cu than PsM6. Owing to its wide action spectrum, the metal resistant PGPB could serve as an effective metal sequestering and growth-promoting bioinoculant for plants in metal-stressed soil. The present study has provided a new insight into the phytoremediation of metal-contaminated soil. SN - 0045-6535 UR - https://www.unboundmedicine.com/medline/citation/18164365/Influence_of_metal_resistant_plant_growth_promoting_bacteria_on_the_growth_of_Ricinus_communis_in_soil_contaminated_with_heavy_metals_ DB - PRIME DP - Unbound Medicine ER -