Effect of the tropical grass Brachiaria brizantha (Hochst. ex A. Rich.) Stapf on microbial population and activity in petroleum-contaminated soil

Merkl, Nicole; Schultze-Kraft, Raíner; Arias, Marianela

doi:10.1016/j.micres.2005.06.005

Cited by 35 publications

(25 citation statements)

References 28 publications

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“…Common soil cleanup technologies are often beyond financial possibilities, especially if large areas or volumes of soil are contaminated. Furthermore, soil structure and biology can be dramatically disturbed or even destroyed making the land useless for agricultural purposes (Conesa et al 2014;Merkl et al 2006). In contrast, phytoremediation, the use of higher plants for decontamination of soil, water, and sediments, is a cost-effective technique that, at the same time, is nondestructive and even has a rehabilitating effect on soil structure and ecology (Marinescu et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Effects of two plant growth-promoting rhizobacteria containing 1-aminocyclopropane-1-carboxylate deaminase on oat growth in petroleum-contaminated soil

Liu

Xie

et al. 2015

Int. J. Environ. Sci. Technol.

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Petroleum is potentially toxic to living organisms, and there are worldwide efforts to develop methods for bioremediation of petroleum-contaminated soils. Phytoremediation is an effective method to reduce the concentration of petroleum in soils, and plant growthpromoting rhizobacteria (PGPR) play an important role in the phytoremediation. Two PGPR, Pseudomonas aeruginosa SLC-2 and Serratia marcescens BC-3, were isolated from the rhizophere of Echinochloa grown in petroleumcontaminated soil. These isolates showed capacities for 1-aminocyclopropane-1-carboxylate (ACC) deaminase activity, indole acetic acid production, siderophore synthesis, and the degradation of petroleum. The ACC deaminase activity of SLC-2 and BC-3 was 2.52 ± 0.03 lmol a-KA (mg PrÁh) -1 and 38.52 ± 0.37 lmol a-KA (mg PrÁh) -1 , respectively. On the other hand, when the concentration of L-Trp increased, the IAA synthesis of BC-3 also increased, while the synthesis of SLC-2 did not change significantly. The ability of synthesized siderophore of SLC-2 was much higher than that of BC-3. The petroleum degradations of SLC-2 and BC-3 increased 4.78 and 7.36 %, respectively. The pot experiment of oat was performed to evaluate the plant growth-promoting abilities of SLC-2 and BC-3. Compared with non-inoculated controls, the height and fresh weight of stems increased (23.64 and 42.57) % and (16.98 and 28.3) %, respectively, whereas the length and fresh weight of roots also increased (10.34 and 20.84) and (24.13 and 43.11) %, respectively, when inoculated with SLC-2 and BC-3. The results indicated that P. aeruginosa SLC-2 and S. marcescens BC-3 can serve as promising microbes for increasing plant growth in petroleum-contaminated soil to improve the phytoremediation efficiency.

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Section: Introductionmentioning

confidence: 99%

Effects of two plant growth-promoting rhizobacteria containing 1-aminocyclopropane-1-carboxylate deaminase on oat growth in petroleum-contaminated soil

Liu

Xie

et al. 2015

Int. J. Environ. Sci. Technol.

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“…Secondly, the by-products of highly active microbial overturn can lead to a direct decrease in soil pH, causing microbial inhibition at later stages of hydrocarbon remediation (Merkl et al, 2006). This was demonstrated in a study with Brachiaria brizantha (Hochst.…”

Section: Discussionmentioning

confidence: 97%

“…), where petroleum hydrocarbons were degraded at a faster rate in planted versus unplanted soil resulting in a higher metabolic turnover (Merkl et al, 2005a). The resulting accumulation of organic acids in the soil subsequently decreased the pH causing microbial inhibition towards the end of the experiment in planted treatments (Merkl et al, 2006).…”

Section: Discussionmentioning

confidence: 99%

Phytoremediation of hydrocarbon contaminants in subantarctic soils: An effective management option

Bramley-Alves

Wasley

King

et al. 2014

Journal of Environmental Management

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Accidental fuel spills on world heritage subantarctic Macquarie Island have caused considerable contamination. Due to the island's high latitude position, its climate, and its fragile ecosystem, traditional methods of remediation are unsuitable for on-site clean up. We investigated the tolerance of a subantarctic native tussock grass, Poa foliosa (Hook. f.), to Special Antarctic Blend (SAB) diesel fuel and its potential to reduce SAB fuel contamination via phytoremediation. Toxicity of SAB fuel to P. foliosa was assessed in an 8 month laboratory growth trial under growth conditions which simulated the island's environment. Single seedlings were planted into 1 L pots of soil spiked with SAB fuel at concentrations of 1000, 5 000, 10 000, 2000 and 40 000 mg/kg (plus control). Plants were harvested at 0, 2, 4 and 8 months and a range of plant productivity endpoints were measured (biomass production, plant morphology and photosynthetic efficiency). Poa foliosa was highly tolerant across all SAB fuel concentrations tested with respect to biomass, although higher concentrations of 20 000 and 40 000 mg SAB/kg soil caused slight reductions in leaf length, width and area. To assess the phytoremediation potential of P. foliosa (to 10 000 mg/kg), soil from the planted pots was compared with that from paired unplanted pots at each SAB fuel concentration. The effect of the plant on SAB fuel concentrations and the associated microbial communities found within the soil (total heterotrophs and hydrocarbon degraders) were compared between planted and unplanted treatments at the 0, 2, 4 and 8 month harvest periods. The presence of plants resulted in significantly less SAB fuel in soils at 2 months and a return to background concentration by 8 months. Microbes did not appear to be the sole driving force behind the observed hydrocarbon loss. This study provides evidence that phytoremediation using P. foliosa is a valuable remediation option for use at Macquarie Island, and may be applicable to the management of fuel spills in other cold climate regions. AbstractAccidental fuel spills on world heritage subantarctic Macquarie Island have caused considerable contamination. Due to the island's high latitude position, its climate, and its fragile ecosystem, traditional methods of remediation are unsuitable for on-site clean up. We investigated the tolerance of a subantarctic native tussock grass, Poa foliosa (Hook. f.), to Special Antarctic Blend (SAB) diesel fuel and its potential to reduce SAB fuel contamination via phytoremediation. Toxicity of SAB fuel to P. foliosa was assessed in an 8 month laboratory growth trial under growth conditions which simulated the island's environment. Single seedlings were planted into 1 L pots of soil spiked with SAB fuel at concentrations of 1 000, 5 000, 10 000, 20 00 and 40 000 mg/kg (plus control). Plants were harvested at 0, 2, 4 and 8 months and a range of plant productivity endpoints were measured (biomass production, plant morphology and photosynthetic efficiency). Poa foliosa was highl...

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“…Root length and stem height were also measured. Then the samples were oven-dried at 70 until the weight was constant and the dry weight was recorded 21) .…”

Section: Determination Of Biomassmentioning

confidence: 99%

Diesel Fuel Degradation from Contaminated Soil by <i>Dracaena reflexa</i> Using Organic Waste Supplementation

Dadrasnia

Pariatamby

2013

J. Jpn. Petrol. Inst.

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The phytoremediation potential of Dracaena reflexa to remediate diesel contaminated soil was determined in a greenhouse study. D. reflexa was planted in soil contaminated with different concentrations of diesel fuel (1, 2.5 and 5 wt%). 5 (wt%) of three different organic wastes [tea leaf (TL), soy cake (SC) and potato skin (PS)] were mixed with the soil and monitored for 270 days. The results of the biodegradation of oil and its fractions showed a reduction of 90 % and 98 % of total petroleum hydrocarbons (TPHs) in soil amended with SC, at 2.5 % and 1 % fuel, respectively. It was observed that in the non-cultivated polluted soil the TPHs, were reduced by 24-27 %. Soil amended with SC provided the greatest diesel fuel loss when compared to other organic waste supplements. D. reflexa roots did not accumulate hydrocarbons from the soil, but the number of hydrocarbon utilizing bacteria was high in the rhizosphere, thus suggesting that the mechanism of the oil degradation was via rhizodegradation. This study has shown that D. reflexa amended with organic wastes has a potential for biodegrading hydrocarboncontaminated soil.

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Effect of the tropical grass Brachiaria brizantha (Hochst. ex A. Rich.) Stapf on microbial population and activity in petroleum-contaminated soil

Cited by 35 publications

References 28 publications

Effects of two plant growth-promoting rhizobacteria containing 1-aminocyclopropane-1-carboxylate deaminase on oat growth in petroleum-contaminated soil

Effects of two plant growth-promoting rhizobacteria containing 1-aminocyclopropane-1-carboxylate deaminase on oat growth in petroleum-contaminated soil

Phytoremediation of hydrocarbon contaminants in subantarctic soils: An effective management option

Diesel Fuel Degradation from Contaminated Soil by <i>Dracaena reflexa</i> Using Organic Waste Supplementation

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