The effects of exogenous plant growth regulators in the phytoextraction of heavy metals

Tassi, Eliana; Pouget, J.; Petruzzelli, G.; Barbafieri, Meri

doi:10.1016/j.chemosphere.2007.10.027

Cited by 132 publications

(69 citation statements)

References 18 publications

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“…However, the application of L-TRP (a precursor of auxin) to the plant roots before transplantation improved plant growth and yield under cadmium stress, and increased plant height, the number of tillers, the number of panicles, 1000 grain weight, and paddy yield of rice, as compared to untreated plants grown in cadmium-contaminated pots without plant growth regulators. The improvement of plant height, the number of tillers, the number of panicles, 1000 grain weight, and paddy yield of rice with the application of L-TRP (a precursor of auxin) in cadmium-contaminated soil might be due to plant growth regulators that could have enhanced the resistance of plants against heavy metal stress or decreased the physiological and metabolic adverse effects of the heavy metal (Tassi et al, 2008;Lequeux et al, 2010). Gharbanli et al (2000) reported that plant growth regulators decreased the adverse effect of cadmium on plant growth by increasing chlorophyll content, consumption of CO 2 , root growth, shoot growth, net assimilation rate, and leaf area ratio in heavy metal stress.…”

Section: Discussionmentioning

confidence: 99%

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Auxin-mediated growth of rice in cadmium-contaminated soil

Farooq¹,

Asghar²,

Khan³

et al. 2015

Turk J Agric For

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Pollution from heavy metals is a global problem that is very dangerous to the environment. Among the heavy metals, cadmium is receiving more and more attention because it is one of the most ecotoxic, making it very harmful for biological activity in soil, biodiversity, plant metabolism, and human and animal health. Phytohormones, produced by plants, control or regulate germination, growth, metabolism, or other physiological activities, and they can alleviate the toxic effects of heavy metals on plant growth. Auxin is the most abundant natural growth hormone, controlling apical dominance, tropism, elongation of shoots, and initiation of roots in plants. However, cadmium stress causes the degradation of indigenous auxin. To cope with this, auxin may be applied exogenously. To evaluate the role of auxin in cadmium -contaminated soil, different levels of the auxin precursor L-TRP were applied to plants growing in contaminated soil. Rice seedlings were dipped in a L-TRP solution for 2 h and transplanted into potted soil contaminated with 30 mg kg -1 cadmium. The results showed that the exogenous application of L-TRP improved the growth and yield of treated plants both in normal and contaminated soil. The data of different parameters showed that L-TRP enhanced plant height (12.54%), the number of tillers (25.53%), the number of panicles (19.04%), the 1000 grain weight (19.28%), and the paddy yield (11.78%) in cadmiumcontaminated soil, as compared to plants grown in the absence of L-TRP with the same level of contamination. L-TRP increased the uptake of cadmium in rice straw while decreasing the translocation of cadmium towards grains, as compared to plants grown in contaminated soil without L-TRP. This experiment revealed the possibility of using L-TRP to improve plant growth and soil health in contaminated soil.

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Section: Discussionmentioning

confidence: 99%

“…Plant growth regulators enhanced the resistance of plants against heavy metal stress. The reduction in heavy metal concentration in grain might be due to an increase in tolerance of grains against stress (Tassi et al, 2008;Alsokari, 2009). Plant growth regulators also improved the growth of rice in normal soil.…”

Section: Discussionmentioning

confidence: 99%

Auxin-mediated growth of rice in cadmium-contaminated soil

Farooq¹,

Asghar²,

Khan³

et al. 2015

Turk J Agric For

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“…It seems that IAA produced by S. meliloti CCNWSX0020 may indirectly promote metal accumulation by increasing the plant biomass. Moreover, the plant transpiration rate was also affected, which subsequently led to more nutrients and subsequently more energy that was needed for copper detoxification and thereby avoiding lethality by high concentrations of Cu 2ϩ in plant tissue (48,49). In addition to genes necessary for nitrogen fixation, acdS (SM0020_23022) encoding ACC deaminase and its upstream regulatory gene (SM0020_23017) were identified in the S. meliloti CCNWSX0020 genome.…”

Section: Figmentioning

confidence: 99%

Genes Conferring Copper Resistance in Sinorhizobium meliloti CCNWSX0020 Also Promote the Growth of Medicago lupulina in Copper-Contaminated Soil

Hao

et al. 2014

Appl Environ Microbiol

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bSinorhizobium meliloti CCNWSX0020, isolated from root nodules of Medicago lupulina growing in gold mine tailings in the northwest of China, displayed both copper resistance and growth promotion of leguminous plants in copper-contaminated soil. Nevertheless, the genetic and biochemical mechanisms responsible for copper resistance in S. meliloti CCNWSX0020 remained uncharacterized. To investigate genes involved in copper resistance, an S. meliloti CCNWSX0020 Tn5 insertion library of 14,000 mutants was created. Five copper-sensitive mutants, named SXa-1, SXa-2, SXc-1, SXc-2, and SXn, were isolated, and the dis-

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“…There have been several studies focused on the phytoremediation of pesticides (Romeh and Mohammed 2013;Romeh 2014, Zhang et al 2014, Ibáñez et al 2014. Sunflower (Helianthus annuus L.) is a relatively high-biomass and fast-growing accumulator plant which has the ability to take up and accumulate metals and radionuclides (Tassi et al 2008;Tahmasbian and Sinegani 2014). Soybean, Glycine max L., produced peroxidase enzymes (McEldoon et al 1995).…”

Section: Azoxystrobinmentioning

confidence: 99%

Evaluation of the phytoremediation potential of three plant species for azoxystrobin-contaminated soil

Romeh

2015

Int. J. Environ. Sci. Technol.

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Azoxystrobin is a broad-spectrum, systemic and soil-applied fungicide used for crop protection on more than 80 different crops. Azoxystrobin use has induced water pollution and ecotoxicological effects upon aquatic organisms, as well as heath issues. Such issues may be solved by phytoremediation. Here, we tested Plantago major L., Helianthus annus L. and Glycine max L. to clean soils under laboratory conditions. Results show that the accumulation efficiency of azoxystrobin and azoxystrobin acid in roots was higher than those of leaves. G. max roots were an efficient accumulator of azoxystrobin (25.32 mg/ kg), followed by P. major roots (20.62 mg/kg) and H. annus roots (18.29 mg/kg), within 10 days, respectively. In the leaves, azoxystrobin significantly translocated into the P. major leaves and reached the maximum after 10 days of exposure (15.03 mg/kg), followed by H. annus leaves (9.8 mg/kg), while it reached the maximum after 3 days of exposure (3.12 mg/kg) in G. max leaves. Azoxystrobin acid significantly accumulated in P. major roots more than the G. max and H. annus roots. In the leaves, azoxystrobin acid significantly accumulated in G. max more than P. major and H. annus. The presence of P. major with Tween 80 had effects on azoxystrobin desorption from soil, plant uptake metabolism and translocation more than P. major alone.

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The effects of exogenous plant growth regulators in the phytoextraction of heavy metals

Cited by 132 publications

References 18 publications

Auxin-mediated growth of rice in cadmium-contaminated soil

Auxin-mediated growth of rice in cadmium-contaminated soil

Genes Conferring Copper Resistance in Sinorhizobium meliloti CCNWSX0020 Also Promote the Growth of Medicago lupulina in Copper-Contaminated Soil

Evaluation of the phytoremediation potential of three plant species for azoxystrobin-contaminated soil

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