Influence of plant growth promoting bacteria and Cr6+ on the growth of Indian mustard

Rajkumar, M.; Nagendran, R.; Lee, Kui Jae; Lee, Wang Hyu; Kim, Sung Zoo

doi:10.1016/j.chemosphere.2005.04.117

Cited by 249 publications

(90 citation statements)

References 26 publications

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“…Relatively higher metal uptake by B. juncea in response to P. fluorescens inoculation, recorded in the present study, showed conformity with the observation of Rajkumar et al (2005) and could be ascribed to its plant growth promoting properties such as synthesis of organic acids, chelators, phytochelatins, siderophores (Banchio et al 2008;Dell'Amico et al 2008). However, T. harzianum assisted moderate enhancement in metal uptake is perhaps due to increasing root absorption area and stimulating the acquisition of plant nutrients including metals ions (Khan et al 2000).…”

Section: Discussionsupporting

confidence: 52%

Phytoextraction of soil cadmium and zinc by microbes-inoculated Indian mustard (Brassica juncea)

Chauhan

Rai

2009

Journal of Plant Interactions

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A pot experiment was carried out to evaluate the effect of Pseudomonas fluorescens and Trichoderma harzianum inoculation on the uptake of zinc (Zn) and cadmium (Cd) by Indian mustard (Brassica juncea) from the soil having three different concentrations of Zn (300, 600, 900 mg/kg) and Cd (5, 10, 15 mg/kg) separately. Microbial inoculation resulted in significantly better plant growth, available metal content and their uptake than control (without microbes). Available Zn was enhanced, ca.1.6-and 1.4-fold and Cd ca. 2.5-and 1.8-fold, by P. fluorescens and T. harzianum respectively. P. fluorescens resulted in an increase in Zn uptake by 113.9, 51.9 and 58.4% and T. harzianum by 42.6, 32.1 and 33.9% over control from soils having 300, 600 and 900 mg Zn, respectively, while of the corresponding results for Cd were 110.2, 48.9 and 58.1% with P. fluorescens and 42.6, 30.9 and 33.4% with T. harzianum from soil having 5, 10 and 15 mg Cd, respectively, after 90 days of treatment. In general the rate of metal uptake was higher during the initial 30 days and declined later.

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Section: Discussionsupporting

confidence: 52%

Phytoextraction of soil cadmium and zinc by microbes-inoculated Indian mustard (Brassica juncea)

Chauhan

Rai

2009

Journal of Plant Interactions

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“…The bestknown mechanism is the utilization ACC by rhizosphere bacteria. A number of PGPB, which stimulate the growth of different plant species (Burd et al, 2000;Belimov et al, 2002;Rajkumar et al, 2006), contain the enzyme ACC deaminase, which hydrolyses ACC (the immediate precursor of the plant hormone ethylene). Some of the plant ACC is exuded from roots or seeds and cleaved by ACC deaminase to NH 3 and a-ketobutyrate (Penrose and Glick, 2001).…”

Section: Discussionmentioning

confidence: 99%

Influence of metal resistant-plant growth-promoting bacteria on the growth of Ricinus communis in soil contaminated with heavy metals

2008

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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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“…The interface between microbes and plant root (rhizosphere) may have a great influence on both the increase of nutrient uptake and decrease of metal toxicity (Smith 1994). The amelioration of heavy metal toxicity in plants by microorganisms may be through reduction in the metal uptake by plants (Vivas et al 2006) or through reduction in the amounts of detrimental stress ethylene induced by heavy metals with no effect on their uptake (Burd et al 1998;Rajkumar et al 2006). On the other hand, metal resistant microbes with plant growth promoting characteristics could improve the availability of heavy metals for plant uptake through solubilization or mobilization, and can be effectively utilized for phytoremediation (Abou-Shanab et al 2003).…”

Section: Growth Profile Analysismentioning

confidence: 99%

Isolation and characterization of heavy metal tolerant Gram-positive bacteria with bioremedial properties from municipal waste rich soil of Kestopur canal (Kolkata), West Bengal, India

Gupta¹,

Chatterjee

Gupta

2012

Biologia

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The present study was conducted to determine the culturable bacterial profile from Kestopur canal (Kolkata, India) and analyze their heavy metal tolerance. In addition to daily sewage including solid and soluble wastes, a considerable load of toxic metals are released into this water body from industries, tanneries and agriculture, household as well as health sectors. Screening out microbes from such an environment was done keeping in mind their multifunctional application especially for bioremediation. Heavy metals are major environmental pollutants when present in high concentration in soil and show potential toxic effects on growth and development in plants and animals. Some edible herbs growing in the canal vicinity, and consumed by people, were found to harbour these heavy metals at sub-toxic levels. The bioconcentration factor of these plants being <1 indicates that they probably only absorb but not accumulate heavy metals. All the thirteen Grampositive bacteria isolated from these plants rhizosphere were found to tolerate high concentration of heavy metals like Co, Ni, Pb, Cr, Fe. Phylogenetic analysis of their 16S rDNA genes revealed that they belonged to one main taxonomic group -the Firmicutes. Seven of them were found to be novel with 92-95% sequence homology with known bacterial strains. Further microbiological analyses show that the alkaliphilic Bacillus weihenstephanensis strain IA1 and Exiguobacterium aestuarii strain CE1, with selective antibiotic sensitivity along with high Ni 2+ and Cr 6+ removal capabilities, respectively, can be prospective candidates for bioremediation.

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Influence of plant growth promoting bacteria and Cr6+ on the growth of Indian mustard

Cited by 249 publications

References 26 publications

Phytoextraction of soil cadmium and zinc by microbes-inoculated Indian mustard (Brassica juncea)

Phytoextraction of soil cadmium and zinc by microbes-inoculated Indian mustard (Brassica juncea)

Influence of metal resistant-plant growth-promoting bacteria on the growth of Ricinus communis in soil contaminated with heavy metals

Isolation and characterization of heavy metal tolerant Gram-positive bacteria with bioremedial properties from municipal waste rich soil of Kestopur canal (Kolkata), West Bengal, India

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