Characterization of Bacteria in the Rhizosphere Soils of<i>Polygonum Pubescens</i>and Their Potential in Promoting Growth and Cd, Pb, Zn Uptake by<i>Brassica napus</i>

Yuan, Jing; Yan, Jun; He, Huaidong; Da-yuan, Yang; Xiao, Li; Zhong, Ting; Yuan, Ming; Cai, Xiaoyu; Li, Shu Bin

doi:10.1080/15226514.2013.773283

Cited by 129 publications

(16 citation statements)

References 35 publications

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“…In many cases, the effects of plant–microbe interactions on growth and metal uptake has been shown to be species- and soil-specific ( Sheng et al, 2008 ; Becerra-Castro et al, 2012 ; Cabello-Conejo et al, 2014 ), but interesting results have also been obtained by inoculating Ni-resistant PGPR isolated from the rhizosphere of Alyssum serpyllifolium and Astragalus incanus on the growth and Ni accumulation of Ricinus communis , Heliantus annus , and Brassica juncea , grown in single and multiple metal-contaminated soils ( Ma et al, 2011a , b , 2015a ; Jing et al, 2014 ). Cd- and Pb-mobilizing rhizospheric bacteria also enhanced the uptake of metals in tomato plants ( Jiang et al, 2008 ) and Zn-mobilizing bacteria, isolated from serpentine soils, promoted Zn, Cu, and Ni accumulation in R. communis ( Rajkumar and Freitas, 2008 ).…”

Section: Introductionmentioning

confidence: 99%

Combined endophytic inoculants enhance nickel phytoextraction from serpentine soil in the hyperaccumulator Noccaea caerulescens

et al. 2015

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This study assesses the effects of specific bacterial endophytes on the phytoextraction capacity of the Ni-hyperaccumulator Noccaea caerulescens, spontaneously growing in a serpentine soil environment. Five metal-tolerant endophytes had already been selected for their high Ni tolerance (6 mM) and plant growth promoting ability. Here we demonstrate that individual bacterial inoculation is ineffective in enhancing Ni translocation and growth of N. caerulescens in serpentine soil, except for specific strains Ncr-1 and Ncr-8, belonging to the Arthrobacter and Microbacterium genera, which showed the highest indole acetic acid production and 1-aminocyclopropane-1-carboxylic acid-deaminase activity. Ncr-1 and Ncr-8 co-inoculation was even more efficient in promoting plant growth, soil Ni removal, and translocation of Ni, together with that of Fe, Co, and Cu. Bacteria of both strains densely colonized the root surfaces and intercellular spaces of leaf epidermal tissue. These two bacterial strains also turned out to stimulate root length, shoot biomass, and Ni uptake in Arabidopsis thaliana grown in MS agar medium supplemented with Ni. It is concluded that adaptation of N. caerulescens in highly Ni-contaminated serpentine soil can be enhanced by an integrated community of bacterial endophytes rather than by single strains; of the former, Arthrobacter and Microbacterium may be useful candidates for future phytoremediation trials in multiple metal-contaminated sites, with possible extension to non-hyperaccumulator plants.

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Section: Introductionmentioning

confidence: 99%

Combined endophytic inoculants enhance nickel phytoextraction from serpentine soil in the hyperaccumulator Noccaea caerulescens

et al. 2015

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“…Unfortunately, metal accumulating plants are not necessarily tolerant and may be subject to metal toxicity at high metal concentrations, leading to poor remediation efficiency (Ebbs and Kochian 1997). Inoculating hyperaccumulators with plant growth promoting bacteria (PGPB) has been demonstrated to promote growth in contaminated environments (de- Bashan, Hernandez, and Bashan 2012;Jing et al 2014), potentially offering a sustainable remediation technology for toxic metal contaminants. However, the effects of PGPB on plant growth promotion under high soil metal contamination are not always satisfactory and remediation efficiency is still relatively low (Zhuang et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Mixed planting with a leguminous plant outperforms bacteria in promoting growth of a metal remediating plant through histidine synthesis

Adediran

Ngwenya

Mosselmans

et al. 2015

International Journal of Phytoremediation

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The effectiveness of plant growth promoting bacteria (PGPB) in improving metal phytoremediation is still limited by stunted plant growth under high soil metal concentrations. Meanwhile, mixed planting with leguminous plants is known to improve yield in nutrient deficient soils but the use of a metal tolerant legume to enhance metal tolerance of a phytoremediator has not been explored. We compared the use of Pseudomonas brassicacearum, Rhizobium leguminosarum, and the metal tolerant leguminous plant Vicia sativa to promote the growth of Brassica juncea in soil contaminated with 400 mg Zn kg(-1), and used synchrotron based microfocus X-ray absorption spectroscopy to probe Zn speciation in plant roots. B. juncea grew better when planted with V. sativa than when inoculated with PGPB. By combining PGPB with mixed planting, B. juncea recovered full growth while also achieving soil remediation efficiency of >75%, the maximum ever demonstrated for B. juncea. μXANES analysis of V. sativa suggested possible root exudation of the Zn chelates histidine and cysteine were responsible for reducing Zn toxicity. We propose the exploration of a legume-assisted-phytoremediation system as a more effective alternative to PGPB for Zn bioremediation.

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“…CC30 significantly enhanced Cu uptake by sunflowers. Moreover, Jing et al (2014) reported that Enterobacter sp. JYX7 and Klebsiella sp.…”

Section: Resultsmentioning

confidence: 99%

Screening and Evaluation of the Bioremediation Potential of Cu/Zn-Resistant, Autochthonous Acinetobacter sp. FQ-44 from Sonchus oleraceus L.

et al. 2016

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The quest for new, promising and indigenous plant growth-promoting rhizobacteria and a deeper understanding of their relationship with plants are important considerations in the improvement of phytoremediation. This study focuses on the screening of plant beneficial Cu/Zn-resistant strains and assessment of their bioremediation potential (metal solubilization/tolerance/biosorption and effects on growth of Brassica napus seedlings) to identify suitable rhizobacteria and examine their roles in microbes-assisted phytoremediation. Sixty Cu/Zn-resistant rhizobacteria were initially isolated from Sonchus oleraceus grown at a multi-metal-polluted site in Shanghai, China. From these strains, 19 isolates that were all resistant to 300 mg⋅L-1 Cu as well as 300 mg⋅L-1 Zn, and could simultaneously grow on Dworkin–Foster salt minimal medium containing 1-aminocyclopropane-1-carboxylic acid were preliminarily selected. Of those 19 isolates, 10 isolates with superior plant growth-promoting properties (indole-3-acetic acid production, siderophore production, and insoluble phosphate solubilization) were secondly chosen and further evaluated to identify those with the highest bioremediation potential and capacity for bioaugmentation. Strain S44, identified as Acinetobacter sp. FQ-44 based on 16S rDNA sequencing, was specifically chosen as the most favorable strain owing to its strong capabilities to (1) promote the growth of rape seedlings (significantly increased root length, shoot length, and fresh weight by 92.60%, 31.00%, and 41.96%, respectively) under gnotobiotic conditions; (2) tolerate up to 1000 mg⋅L-1 Cu and 800 mg⋅L-1 Zn; (3) mobilize the highest concentrations of water-soluble Cu, Zn, Pb, and Fe (16.99, 0.98, 0.08, and 3.03 mg⋅L-1, respectively); and (4) adsorb the greatest quantities of Cu and Zn (7.53 and 6.61 mg⋅g-1 dry cell, respectively). Our findings suggest that Acinetobacter sp. FQ-44 could be exploited for bacteria-assisted phytoextraction. Moreover, the present study provides a comprehensive method for the screening of rhizobacteria for phytoremediation of multi-metal-polluted soils, especially those sewage sludge-amended soils contaminated with Cu/Zn.

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Characterization of Bacteria in the Rhizosphere Soils ofPolygonum Pubescensand Their Potential in Promoting Growth and Cd, Pb, Zn Uptake byBrassica napus

Cited by 129 publications

References 35 publications

Combined endophytic inoculants enhance nickel phytoextraction from serpentine soil in the hyperaccumulator Noccaea caerulescens

Combined endophytic inoculants enhance nickel phytoextraction from serpentine soil in the hyperaccumulator Noccaea caerulescens

Mixed planting with a leguminous plant outperforms bacteria in promoting growth of a metal remediating plant through histidine synthesis

Screening and Evaluation of the Bioremediation Potential of Cu/Zn-Resistant, Autochthonous Acinetobacter sp. FQ-44 from Sonchus oleraceus L.

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