Root exudates ameliorate cadmium tolerance in plants: A review

Bali, Aditi Shreeya; Sidhu, Gagan Preet Singh; Kumar, Vinod

doi:10.1007/s10311-020-01012-x

Cited by 147 publications

(44 citation statements)

References 213 publications

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“…All treatments with plants showed a lower readily bioavailable Cd in soil than unplanted control (Table 2), which reveals a strong contribution of rhizosphere processes to Cd immobilization through the interaction of soil microflora and root chelating substances (e.g., phytosiderophores) [89]. Differently, Pb NH 4 NO 3 -extractable concentration of the control (C0-B0) showed no significant differences as compared with unplanted control.…”

Section: Soil Mineral Nitrogen and Pte Promptly Bioavailable Concentrationsmentioning

confidence: 88%

Securing of an Industrial Soil Using Turfgrass Assisted by Biostimulants and Compost Amendment

et al. 2020

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This work aimed to study the effects of compost (applied at two rates) and two commercial microbial biostimulants on the mobility and bioavailability of potentially toxic elements (PTEs) in an industrial soil phytostabilized by Dactylis glomerata L. or a mixed stand of grasses (Lolium perenne L., Poa pratensis L. and Festuca arundinacea Shreb.). The soil showed very high pseudototal and bioavailable concentrations of cadmium (Cd) and lead (Pb), due to improper lead-acid batteries storage. Compost amendment in combination with the two biostimulants produced the best outcomes in terms of plant growth and nutrient uptake. The same mix of beneficial microbes improved soil biological fertility enhancing soil nitrogen fixing and ammonia oxidizing bacteria, while reduced the pore water and NH4NO3 extractable concentrations of Cd and at lower extent of Pb in soil. Accordingly, the lower mobility and bioavailability of Cd in soil determined a lower uptake and accumulation of Cd in shoots of different grass species. Our results suggest that a green cap with turfgrass assisted by biostimulants and compost amendment in PTE-contaminated industrial sites could be a reliable and effective practice to protect and restore soil biological fertility and to reduce the risk of PTE dispersion in the surrounding environment.

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Section: Soil Mineral Nitrogen and Pte Promptly Bioavailable Concentrationsmentioning

confidence: 88%

Securing of an Industrial Soil Using Turfgrass Assisted by Biostimulants and Compost Amendment

et al. 2020

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“…The role of root exudates: Roots extrude H + (protons) and carbon compounds such as organic acids, phenols and phytosiderophores to promote solubility of essential nutrients (Bali et al, 2020). H + lower the rhizosphere pH which increases soil mineral solubility and hence the release of essential nutrients such as Fe, P (phosphorus), Ca, Mg and S (sulfur), but also the release of toxic metals.…”

Section: Metal Toxicity; Similarities In Mechanisms and Responsesmentioning

confidence: 99%

“…Cd chelation is an important aspect of detoxification. Chelation occurs via several ways; plant released organic acids and phytosiderophores can remove some of the soluble Cd fraction from the soil solution though siderophore production may only be significant during Fe stress (Bali et al, 2020). Organic acids and phenolic compounds also bind considerable amounts of Cd (Pinto et al, 2008, Guo et al, 2016.…”

Section: Cadmiummentioning

confidence: 99%

The role of roots and rhizosphere in providing tolerance to toxic metals and metalloids

Podar

Maathuis

2021

Preprint

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Human activity and natural processes have led to widespread dissemination of metals and metalloids, many of which are toxic and have a negative impact on agronomic production. Roots, as the first point of contact, are essential in endowing plants with tolerance to excess metal(loid) in the soil. The most important root responses include: adaptation of transport processes that affect uptake, efflux and long distance transport of metal(loid)s; metal(loid) detoxification within root cells via conjugation to thiol rich compounds and subsequent sequestration in the vacuole; plasticity in root architecture; the presence of bacteria and fungi in the rhizosphere that impact on metal(loid) bioavailability; the role of root exudates. In this review we will provide details on these processes and assess their relevance for the detoxification of arsenic, cadmium, mercury and zinc. Furthermore, we will assess if any of these methodologies has been tested in field conditions and whether they are effective in terms of improving crop metal(loid) tolerance.

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“…It is well established that cadmium is a toxic metal for plants that is transported in plants through several root-linked proteins i.e., metal transporters and channels before its accumulation in edible parts [12]. Moreover, its bioavailability, uptake, and translocation in plant tissues and toxicity is affected by edaphic, climatic, and other anthropogenic activities [13,14]. Cadmium compounds are more soluble than other heavy metals which favor its bioavailability, absorption, and accumulation in plant systems.…”

Section: Introductionmentioning

confidence: 99%

Efficacy of Indole Acetic Acid and Exopolysaccharides-Producing Bacillus safensis Strain FN13 for Inducing Cd-Stress Tolerance and Plant Growth Promotion in Brassica juncea (L.)

et al. 2021

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Untreated wastewater used for irrigating crops is the major source of toxic heavy metals and other pollutants in soils. These heavy metals affect plant growth and deteriorate the quality of edible parts of growing plants. Phytohormone (IAA) and exopolysaccharides (EPS) producing plant growth-promoting rhizobacteria can reduce the toxicity of metals by stabilizing them in soil. The present experiment was conducted to evaluate the IAA and EPS-producing rhizobacterial strains for improving growth, physiology, and antioxidant activity of Brassica juncea (L.) under Cd-stress. Results showed that Cd-stress significantly decreased the growth and physiological parameters of mustard plants. Inoculation with Cd-tolerant, IAA and EPS-producing rhizobacterial strains, however, significantly retrieved the inhibitory effects of Cd-stress on mustard growth, and physiology by up regulating antioxidant enzyme activities. Higher Cd accumulation and proline content was observed in the roots and shoot tissues upon Cd-stress in mustard plants while reduced proline and Cd accumulation was recorded upon rhizobacterial strains inoculation. Maximum decrease in proline contents (12.4%) and Cd concentration in root (26.9%) and shoot (29%) in comparison to control plants was observed due to inoculation with Bacillus safensis strain FN13. The activity of antioxidant enzymes was increased due to Cd-stress; however, the inoculation with Cd-tolerant, IAA-producing rhizobacterial strains showed a non-significant impact in the case of the activity of superoxide dismutase (SOD), peroxidase (POX) and catalase (CAT) in Brassica juncea (L.) plants under Cd-stress. Overall, Bacillus safensis strain FN13 was the most effective strain in improving the Brassica juncea (L.) growth and physiology under Cd-stress. It can be concluded, as the strain FN13 is a potential phytostabilizing biofertilizer for heavy metal contaminated soils, that it can be recommended to induce Cd-stress tolerance in crop plants.

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Root exudates ameliorate cadmium tolerance in plants: A review

Cited by 147 publications

References 213 publications

Securing of an Industrial Soil Using Turfgrass Assisted by Biostimulants and Compost Amendment

Securing of an Industrial Soil Using Turfgrass Assisted by Biostimulants and Compost Amendment

The role of roots and rhizosphere in providing tolerance to toxic metals and metalloids

Efficacy of Indole Acetic Acid and Exopolysaccharides-Producing Bacillus safensis Strain FN13 for Inducing Cd-Stress Tolerance and Plant Growth Promotion in Brassica juncea (L.)

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