Lowered Cd toxicity, uptake and expression of metal transporter genes in maize plant by ACC deaminase-producing bacteria Achromobacter sp.

Sun, Lina; Zhang, Xihong; Ouyang, Wenkai; Yang, En-hui; Cao, Yuanyuan; Sun, Run‐Cang

doi:10.1016/j.jhazmat.2021.127036

Cited by 37 publications

(12 citation statements)

References 54 publications

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“…This is why it seems imperative to introduce technology that would limit the transport of this element to the above‐ground parts of plants. In the case of Cd occurring in an excessive amount in the soil, it can be confirmed that the element is relatively intensively taken up by plants and easily transported by the root system to the remaining organs, especially to the above‐ground parts (Sun et al, 2021). This relationship was not observed in the carried out studies – a large share of this element was mostly accumulated in roots and not in stems of L. perenne , which can be explained by high soil pH value, resulting in the formation of poorly soluble Cd speciations in soil, which limit the uptake of metal by the plant.…”

Section: Resultsmentioning

confidence: 98%

Nanoporous zeolite and its effect on the immobilization of trace elements in soils from scrap landfills under aided phytostabilization

et al. 2022

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The rising prerequisite for developing novel green remediation methods for trace‐element‐contaminated lands is allied to the necessity to really mend the soil environs. The effectiveness of zeolite‐aided phytostabilization (AP) of soil contaminated with trace elements (TEs), from a scrap yard, using Lolium perenne as the plant for testing, was determined and discussed. The variability and activity of the rhizospheric bacterial community were also examined. The initial soil used in the AP experiment was characterized by especially high total contents of Zn, Pb, Cu and Cd. The TE total contents in roots and aboveground parts of L. perenne as well as in the phytostabilized soil materials were analyzed with flame atomic absorption spectrometry. The study revealed that the addition of natural zeolite into TE‐contaminated soil increased the relative plant biomass as well as the soil pH value as compared to the phytostabilized non‐amended series, whereas the total contents (with respect to an absolute value) of Zn, Pb, Cu and Cd were generally higher in roots than in the aboveground parts of L. perenne. In particular, the incorporation of zeolite to the soil contributed most significantly to the considerable relative decrease in the total contents of Cu, Pb, Cd and Zn in the soil, as well as the content of bioavailable and leachable speciations of Cd, Cu, Zn and Pb extracted from the soil using CaCl2 solution as compared to the non‐amended series. In the phytostabilized zeolite‐amended soil, the overall bacterial diversity decreased but the presence of zeolite favoured the growth of microorganisms belonging to Gammaproteobacteria, Planctomycetia, and Thermomicrobia, in particular, the genera Mycobacterium, Williamsia, and Prochlorococcus.

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Section: Resultsmentioning

confidence: 98%

Nanoporous zeolite and its effect on the immobilization of trace elements in soils from scrap landfills under aided phytostabilization

et al. 2022

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“…According to available reports, etr1‐1 and ein3‐3 are more resistant to excess Li (Fu et al, 2014 ) than WT Arabidopsis . The application of ACC deaminase‐producing bacteria inhibits metal uptake by plants (Sun et al, 2022 ), indicating that the deactivation of ethylene biosynthesis/signalling can be beneficial for plants under metal toxicity. Conversely, Li et al ( 2015 ) showed that activation of ethylene synthesis under excess Fe plays an important role in Arabidopsis Fe tolerance.…”

Section: Discussionmentioning

confidence: 99%

“…According to available reports, etr1-1 and ein3-3 are more resistant to excess Li (Fu et al, 2014) than WT Arabidopsis. The application of ACC deaminase-producing bacteria inhibits metal uptake by plants (Sun et al, 2022), indicating that the deactivation of ethylene biosynthesis/signalling can be beneficial for plants under metal toxicity. Conversely, Li et al (2015) showed that activation of Ethylene was shown to activate IRT1 transcription under Fe deficiency (García et al, 2015;Lingam et al, 2011;Lucena et al, 2006;Waters et al, 2007) and to contribute to the regulation of IRT1 expression along the root axis (Ivanov et al, 2014).…”

Section: Siderophore Production By the Endophytic Fungusmentioning

confidence: 99%

Endophytic yeast protect plants against metal toxicity by inhibiting plant metal uptake through an ethylene‐dependent mechanism

Domka

Jędrzejczyk

Ważny

et al. 2022

Plant Cell & Environment

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Toxic metal pollution requires significant adjustments in plant metabolism. Here, we show that the plant microbiota plays an important role in this process. The endophytic Sporobolomyces ruberrimus isolated from a serpentine population of Arabidopsis arenosa protected plants against excess metals. Coculture with its native host and Arabidopsis thaliana inhibited Fe and Ni uptake. It had no effect on host Zn and Cd uptake. Fe uptake inhibition was confirmed in wheat and rape. Our investigations show that, for the metal inhibitory effect, the interference of microorganisms in plant ethylene homeostasis is necessary. Application of an ethylene synthesis inhibitor, as well as loss‐of‐function mutations in canonical ethylene signalling genes, prevented metal uptake inhibition by the fungus. Coculture with S. ruberrimus significantly changed the expression of Fe homeostasis genes: IRT1, OPT3, OPT6, bHLH38 and bHLH39 in wild‐type (WT) A. thaliana. The expression pattern of these genes in WT plants and in the ethylene signalling defective mutants significantly differed and coincided with the plant accumulation phenotype. Most notably, down‐regulation of the expression of IRT1 solely in WT was necessary for the inhibition of metal uptake in plants. This study shows that microorganisms optimize plant Fe and Ni uptake by fine‐tuning plant metal homeostasis.

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“…Ethylene regulates multiple plant traits related to stress responses, but the same stress response beneficial to plants may make it harmful: several metal ion transporters, such as Fe 2+ and Zn 2+ , can be induced by ethylene, which confers the increased accumulation of heavy metals ( Ravanbakhsh et al, 2019 ). It is increasingly aware that the levels of ethylene in plants can be steered by microorganisms that degrade or increase the levels of this hormone ( Ravanbakhsh et al, 2019 ; Sun et al, 2022 ). It is well documented that ACC deaminase-producing bacteria can change plant physiology, which is similar to the mutants defective in ethylene signal transduction pathways ( Santoyo et al, 2016 ).…”

Section: Discussionmentioning

confidence: 99%

“…The ACC deaminase-producing bacteria can enhance the tolerance of plants to various stresses, such as drought, salt, and waterlogging, by inhibiting overproduction of ethylene ( Ali and Kim, 2018 ; Gupta and Pandey, 2019 ; Orozco-Mosqueda et al, 2019 ; Danish et al, 2021 ). The ACC deaminase-producing bacteria have also been reported to mediate the production of ethylene and thus alleviate Cd stress by inhibiting the expression of Fe acquisition-related genes, such as HMA3 and Nramp5 ( Sun et al, 2022 ). In this study, under Cd stress, a large number of DEG in the roots of rice seedlings treated with MCS15 were enriched to the “ethylene synthesis” and “metal ion transport” pathways, indicating that MCS15 may help to reduce the Cd toxicity in rice plants through these pathways.…”

Section: Discussionmentioning

confidence: 99%

A Glucuronic Acid-Producing Endophyte Pseudomonas sp. MCS15 Reduces Cadmium Uptake in Rice by Inhibition of Ethylene Biosynthesis

et al. 2022

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Dynamic regulation of phytohormone levels is pivotal for plant adaptation to harmful conditions. It is increasingly evidenced that endophytic bacteria can regulate plant hormone levels to help their hosts counteract adverse effects imposed by abiotic and biotic stresses, but the mechanisms underlying the endophyte-induced stress resistance of plants remain largely elusive. In this study, a glucuronic acid-producing endophyte Pseudomonas sp. MCS15 alleviated cadmium (Cd) toxicity in rice plants. Inoculation with MCS15 significantly inhibited the expression of ethylene biosynthetic genes including OsACO3, OsACO4, OsACO5, OsACS2, and OsACS5 and thus reduced the content of ethylene in rice roots. In addition, the expression of iron uptake-related genes including OsIRT1, OsIRT2, OsNAS1, OsNAS2 and OsYSL15 was significantly downregulated in the MCS15-inoculated roots under Cd stress. Similarly, glucuronic acid treatment also remarkably inhibited root uptake of Cd and reduced the production of ethylene. However, treatment with 1-aminocyclopropyl carboxylic acid (ACC), a precursor of ethylene, almost abolished the MCS15 or glucuronic acid-induced inhibition of Cd accumulation in rice plants. Conversely, treatment with aminoethoxyvinyl glycine (AVG), an inhibitor of ethylene biosynthesis, markedly reduced the Cd accumulation in plants. Taken together, our results revealed that the endophytic bacteria MCS15-secreted glucuronic acid inhibited the biosynthesis of ethylene and thus weakened iron uptake-related systems in rice roots, which contributed to preventing the Cd accumulation.

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Lowered Cd toxicity, uptake and expression of metal transporter genes in maize plant by ACC deaminase-producing bacteria Achromobacter sp.

Cited by 37 publications

References 54 publications

Nanoporous zeolite and its effect on the immobilization of trace elements in soils from scrap landfills under aided phytostabilization

Nanoporous zeolite and its effect on the immobilization of trace elements in soils from scrap landfills under aided phytostabilization

Endophytic yeast protect plants against metal toxicity by inhibiting plant metal uptake through an ethylene‐dependent mechanism

A Glucuronic Acid-Producing Endophyte Pseudomonas sp. MCS15 Reduces Cadmium Uptake in Rice by Inhibition of Ethylene Biosynthesis

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