Enhancing of Phytoremediation Efficiency Using Indole-3-Acetic Acid (IAA)

Ji, Puhui; Jiang, Yongji; Tang, Xiwang; Nguyen, Thanh Hung; Tong, Yanan; Gao, Pengcheng; Han, Wenshe

doi:10.1080/15320383.2015.1071777

Cited by 27 publications

(10 citation statements)

References 25 publications

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“…After applying IAA, there was no significant difference in TF values in plants among treatments, except TF of Pb in L. rubrum at the dose of 20 ppm. Previous studies have shown that exogenous application of IAA can reduce the stress of heavy metals on different plants, promote plant growth, improve the absorption and transport of heavy metals, and improve the repair efficiency of heavy metals [ 34 , 59 , 60 ]. However, there are also reports on the contrary.…”

Section: Resultsmentioning

confidence: 99%

“…Zhiqin Chen et al sprayed IAA to S. alfredii planted in the soil polluted by heavy metals but found that the TF value of Zn had no change [ 57 ]. Ji et al found applying IAA did not affect the Cd translocation factor for Solanum nigrum [ 34 ]. In addition, Fassler pointed out that the effect of IAA in reducing heavy metal stress to plants would fail if the concentrations of heavy metals in soils were too high [ 59 ].…”

Section: Resultsmentioning

confidence: 99%

“…IAA was sprayed as the plant growth regulator on the leaves of each plant. The reported dose of IAA ranged from 4.4 to 100 mg L −1 [ 33 , 34 , 36 ], with effects being species-specific. Therefore, the commonly used concentrations of 10 mg L –1 and 20 mg L –1 were selected to examine the effects on the phytoremediation efficiency of the two plants.…”

Section: Methodsmentioning

confidence: 99%

“…Under heavy metal stress, the decrease in plant growth and biomass resulted in a decrease in bioremediation efficiency [ 30 ]. In order to improve the uptake and accumulation of metals in plants, various strategies have been used, including fertilizers, chelating agents, surfactants, and plant growth regulators (PGRs) [ 31 , 32 , 33 , 34 ]. For example, a study has shown that exogenous indoleacetic acid (IAA) can alleviate the stress of heavy metals on plants by changing plant growth parameters [ 31 ].…”

Section: Introductionmentioning

confidence: 99%

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Utilization of Indole Acetic Acid with Leucadendron rubrum and Rhododendron pulchrum for the Phytoremediation of Heavy Metals in the Artificial Soil Made of Municipal Sewage Sludge

Chen

Feng

Mou

et al. 2022

Toxics

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The development of phytoremediation by garden plants is an effective way to deal with the dilemma of municipal sewage sludge disposal. In this study, two ornamental plants were used as phytoremediation plants to rehabilitate heavy-metal-contaminated municipal sewage sludge in field experiments, and the role of exogenous phytohormone IAA was also tested. Ornamental plants Loropetalum chinense var. rubrum (L. rubrum) and Rhododendron pulchrum (R. pulchrum) adapted well to the artificial soil made of municipal sewage sludge, and the concentrations of Cu, Zn, Pb, and Ni were decreased by 7.29, 261, 20.2, and 11.9 mg kg−1, respectively, in the soil planted with L. rubrum, and 7.60, 308, 50.1, and 17.7 mg kg−1, respectively, in the soil planted with R. pulchrum, accounted for 11–37% of the total amounts and reached significant levels (p < 0.05), except Cd. The concentration of Pb in all parts of the two ornamental plants was increased, as well as most heavy metals in L. rubrum root. As a result, three months after transplant, the phyto-extraction amounts in L. rubrum were 397, 10.9, and 1330 μg for Ni, Cd, and Pb, respectively, increased by 233% to 279%. The phyto-extraction amount in R. pulchrum were 1510, 250, and 237 μg for Zn, Pb, and Cu, respectively, increased by 143% to 193%. These results indicated a potential to remediate heavy metals of the two ornamental plants, especially L. rubrum. The results of correlation analysis implied that the interaction of heavy metals in the plant itself played an important role in the uptake of heavy metals. This seemed to explain why applying IAA in the experiment had little effect on plant growth and phytoremediation of heavy metals. This study provided a green and feasible idea for the proper disposal of municipal sewage sludge.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Utilization of Indole Acetic Acid with Leucadendron rubrum and Rhododendron pulchrum for the Phytoremediation of Heavy Metals in the Artificial Soil Made of Municipal Sewage Sludge

Chen

Feng

Mou

et al. 2022

Toxics

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“…However, PE also has some limitations, the main limitation being the long time that is required for remediation. For example, it has been estimated that it would take over 100 years to remove a total Pb concentration of 1000 mg kg −1 from soil and several decades even when used in combination with chelation to enhance the solubility of heavy metals in the soil , although recent research has shown that PE combined with a material such as compost , humate , or indole‐3‐acetic acid can remove heavy metals at a higher rate than PE treatment alone. In addition, PE also requires long periods even when using a hyperaccumulator (a plant that can accumulate high concentrations of heavy metals from the soil), particularly in heavily contaminated soil .…”

Section: Introductionmentioning

confidence: 99%

Lead and Antimony Removal from Contaminated Soil by Phytoremediation Combined with an Immobilization Material

Katoh

Hashimoto

Sato

2016

CLEAN Soil Air Water

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Phytoextraction (PE) requires long periods for the removal of heavy metals from contaminated soil, even when using a hyperaccumulator. Thus, we designed a new phytoremediation technique called phytosuction separation (PS-S), in which a material that immobilized heavy metals was placed onto contaminated soil and plants were grown on the upper layer of this material. Heavy metals in the soil were transported toward the upper layer by the water suction effect of the roots and immobilized by the material and then removed from the contaminated soil. A pot experiment was conducted to evaluate the ability of PS-S to remove lead (Pb) and antimony (Sb) from the soil. We found that evapotranspiration and shoot biomass were significantly higher in plants grown using PS-S than those grown using PE. The pot experiment demonstrated that PS-S was effective in removing Pb and Sb, and the concentrations of Pb and Sb removed by PS-S were 8-25 and 69-533 times higher than that removed by PE, respectively. Sb could be effectively removed by PS-S from contaminated soil where the concentration of Sb removed corresponded to 166-380% of water-soluble Sb in contaminated soil. This study clearly demonstrated that PS-S was effective in removing Pb and Sb from the contaminated soil and would be particularly useful for removing elements with high mobility.

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