An indoleacetic acid-producing<i>Ochrobactrum</i>sp. MGJ11 counteracts cadmium effect on soybean by promoting plant growth

Yu, Xiumei; Li, Y.; Cui, Yongliang; Liu, R.; Chen, Q.; Gu, Yunfu; Zhao, Ke; Xiang, Quanju; Xu, Kaiwei; Zhang, X.

doi:10.1111/jam.13379

Cited by 25 publications

(21 citation statements)

References 57 publications

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“…The production of IAA by strain YH1 is higher (>100 μg ml −1 ) than most rhizobial stains previously reported and can be considered as an IAA-overproducer (Chiboub et al, 2016; Yu et al, 2017). It is observed that negative impact of metal accumulation inside plant tissues could be mitigated by the application of IAA (Nadeem et al, 2015).…”

Section: Discussionmentioning

confidence: 73%

Inoculation of Sinorhizobium saheli YH1 Leads to Reduced Metal Uptake for Leucaena leucocephala Grown in Mine Tailings and Metal-Polluted Soils

Kang

Cui

et al. 2018

Front. Microbiol.

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Metalliferous mine tailings have a negative impact on the soil environment near mining areas and render cultivable lands infertile. Phytoremediation involving the synergism of legume and rhizobia provides a useful technique in tackling this issue with cost-effective, environmentally friendly, and easy-to-use features under adverse soil conditions. Leucaena leucocephala has been found to build symbiotic relationships with native rhizobia in the iron-vanadium-titanium oxide (V-Ti magnetite) mine tailing soil. Rhizobia YH1, isolated from the root nodules of L. leucocephala, was classified as Sinorhizobium saheli according to similarity and phylogenetic analyses of 16S rRNA, housekeeping and nitrogen fixation genes. Besides nitrogen fixation, S. saheli YH1 also showed capabilities to produce indole-acetic acid (IAA) (166.77 ± 2.03 mg l−1) and solubilize phosphate (104.41 ± 7.48 mg l−1). Pot culture experiments showed that strain YH1 increased the biomass, plant height and root length of L. leucocephala by 67.2, 39.5 and 27.2% respectively. There was also an average increase in plant N (10.0%), P (112.2%) and K (25.0%) contents compared to inoculation-free control. The inoculation of YH1 not only reduced the uptake of all metals by L. leucocephala in the mine tailings, but also resulted in decreased uptake of Cd by up to 79.9% and Mn by up to 67.6% for plants grown in soils contaminated with Cd/Mn. It was concluded that S. saheli YH1 possessed multiple beneficial effects on L. leucocephala grown in metalliferous soils. Our findings highlight the role of S. saheli YH1 in improving plant health of L. leucocephala by reducing metal uptake by plants grown in heavy metal-polluted soils. We also suggest the idea of using L. leucocephala-S. saheli association for phytoremediation and revegetation of V-Ti mine tailings and soils polluted with Cd or Mn.

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Section: Discussionmentioning

confidence: 73%

Inoculation of Sinorhizobium saheli YH1 Leads to Reduced Metal Uptake for Leucaena leucocephala Grown in Mine Tailings and Metal-Polluted Soils

Kang

Cui

et al. 2018

Front. Microbiol.

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“…Previous research demonstrated that reduction in root diameter may enable relatively higher growth rates and rapid resource acquisition through expansion of the root system coupled with lower investment in dry biomass [15]. These results suggest that induction of greater root length may be related to the production of IAA and/or other yet unknown metabolites produced by PGPB [16]. The benefits of inoculation on root length and plant growth may possibly involve the proximity of the site of interaction between PGPB and plant tissues [17].…”

Section: Discussionmentioning

confidence: 94%

Gluconacetobacter diazotrophicus Changes The Molecular Mechanisms of Root Development in Oryza sativa L. Growing Under Water Stress

Silva

Filgueiras

Santos

et al. 2020

IJMS

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Background: Inoculation with Gluconacetobacter diazotrophicus has shown to influence root development in red rice plants, and more recently, the induced systemic tolerance (IST) response to drought was also demonstrated. The goal of this study was to evaluate the inoculation effect of G. diazotrophicus strain Pal5 on the amelioration of drought stress and root development in red rice (Oryza sativa L.). Methods: The experimental treatments consist of red rice plants inoculated with and without strain Pal5 in presence and absence of water restriction. Physiological, biochemical, and molecular analyses of plant roots were carried out, along with measurements of growth and biochemical components. Results: The plants showed a positive response to the bacterial inoculation, with root growth promotion and induction of tolerance to drought. An increase in the root area and higher levels of osmoprotectant solutes were observed in roots. Bacterial inoculation increased the drought tolerance and positively regulated certain root development genes against the water deficit in plants. Conclusion: G. diazotrophicus Pal5 strain inoculation favored red rice plants by promoting various root growth and developmental mechanisms against drought stress, enabling root development and improving biochemical composition.

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“…; Yu et al . ). In this study, the SOD activity of the inoculated soybeans was significantly higher ( P < 0·05, n = 3) than that of the control plants in Cd‐contaminated soil, suggesting that the Cd 2+ ‐removing R. pusense KG2 improved soybean plant tolerance against Cd.…”

Section: Discussionmentioning

confidence: 97%

“…However, it is unknown whether these Cd 2+immobilized micro-organisms can decrease the soil Cd availability for plants or not. Previous studies showed that some PGPR, such as IAA-producing bacteria, have been used to lower the Cd uptake of plants in Cd-contaminated soil (Yu et al 2017). A Cd-tolerant PGPR rhizobium increased the Cd concentration in the root of Lolium multiflorum Lam by enhancing the Cd availability and plant biomass but decreased the Cd concentration in the root and shoot of G. max (L.) (Guo and Chi 2014), suggesting that the same PGPR has a diverse effect on the different plants.…”

Section: Discussionmentioning

confidence: 99%

“…As an enzymatic scavenger of ROS, SOD provides a defence system for aerobic organisms against environmental stress (Alscher et al 2002). It is found that the rhizosphere inoculation of plant growth-promoting bacteria can increase the SOD activity of plants under heavy metal stress (Fatnassi et al 2015;Yu et al 2017). In this study, the SOD activity of the inoculated soybeans was significantly higher (P < 0Á05, n = 3) than that of the control plants in Cd-contaminated soil, suggesting that the Cd 2+ -removing R. pusense KG2 improved soybean plant tolerance against Cd.…”

Section: Discussionmentioning

confidence: 99%

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The potential of cadmium ion-immobilized Rhizobium pusense KG2 to prevent soybean root from absorbing cadmium in cadmium-contaminated soil

Cui

et al. 2019

J Appl Microbiol

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Aims Because the effect of Cd2+‐immobilized microbe on Cd uptake of plants in Cd‐contaminated soil remains underexplored, this study focuses on the effect of Cd2+‐immobilized rhizobia on Cd uptake of soybean. Methods and Results Strain KG2 from soybean nodule was identified as Rhizobium pusense KG2 by phylogenetic analysis. Rhizobium pusense KG2 showed the 120 mg l−1 of minimal lethal concentration for Cd2+. In 50 and 100 mg l−1 of Cd2+ liquid, approximately 2 × 1010 cells removed 56·71 and 22·11% of Cd2+, respectively. In pot soil containing 50 and 100 mg kg−1 of Cd2+, strain KG2 caused a 45·9 and 35·3% decrease in soybean root Cd content, respectively. Meanwhile, KG2 improved the root and shoot length, nitrogen content and biomass of soybean plants and superoxide dismutase activity. Conclusions The Cd2+‐immobilized rhizobia could inhibit soybean plants to absorb Cd2+ from soil, promote plant growth and improve plant's tolerance against Cd. This study is the first time to report that R. pusense is an effective nodulating rhizobium of legume. Significance and Impact of the Study Some Cd2+‐immobilized microbe lowering Cd uptake of plant and promoting plant growth should be considered as an effective strategy for producing safety crops in the Cd‐contaminated agricultural soil.

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An indoleacetic acid-producingOchrobactrumsp. MGJ11 counteracts cadmium effect on soybean by promoting plant growth

Cited by 25 publications

References 57 publications

Inoculation of Sinorhizobium saheli YH1 Leads to Reduced Metal Uptake for Leucaena leucocephala Grown in Mine Tailings and Metal-Polluted Soils

Inoculation of Sinorhizobium saheli YH1 Leads to Reduced Metal Uptake for Leucaena leucocephala Grown in Mine Tailings and Metal-Polluted Soils

Gluconacetobacter diazotrophicus Changes The Molecular Mechanisms of Root Development in Oryza sativa L. Growing Under Water Stress

The potential of cadmium ion-immobilized Rhizobium pusense KG2 to prevent soybean root from absorbing cadmium in cadmium-contaminated soil

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