Application of plant growth-promoting endophytes (PGPE) isolated from Solanum nigrum L. for phytoextraction of Cd-polluted soils

Chen, Liang; Luo, Shenglian; Xiao, Xiao; Guo, Hanjun; Chen, Jueliang; Wan, Yong; Li, Bo; Xu, Ting; Xi, Qiang; Rao, Chan; Liu, Chengbin; Zeng, Guangming

doi:10.1016/j.apsoil.2010.10.003

Cited by 170 publications

(64 citation statements)

References 52 publications

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“…The presence of genes conferring heavy-metal resistance in microbes provides a selective advantage for survival in contaminated environments (42). In addition, phytohormones produced by microbes also play an important role in strengthening plant growth in applications such as phytoremediation (4). We assumed that the beneficial contributions of these bacteria to the plants in a metal-contaminated environment would be due either to the presence of metal resistance determinants or to plant-growth-promoting factors.…”

Section: Discussionmentioning

confidence: 99%

Genome Sequence and Mutational Analysis of Plant-Growth-Promoting Bacterium Agrobacterium tumefaciens CCNWGS0286 Isolated from a Zinc-Lead Mine Tailing

Hao

Xie

Johnstone

et al. 2012

Appl Environ Microbiol

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The plant-growth-promoting bacterium Agrobacterium tumefaciens CCNWGS0286, isolated from the nodules of Robinia pseudoacacia growing in zinc-lead mine tailings, both displayed high metal resistance and enhanced the growth of Robinia plants in a metal-contaminated environment. Our goal was to determine whether bacterial metal resistance or the capacity to produce phytohormones had a larger impact on the growth of host plants under zinc stress. Eight zinc-sensitive mutants and one zinc-sensitive mutant with reduced indole-3-acetic acid (IAA) production were obtained by transposon mutagenesis. Analysis of the genome sequence and of transcription via reverse transcriptase PCR (RT-PCR) combined with transposon gene disruptions revealed that ZntA-4200 and the transcriptional regulator ZntR1 played important roles in the zinc homeostasis of A. tumefaciens CCNWGS0286. In addition, interruption of a putative oligoketide cyclase/lipid transport protein reduced IAA synthesis and also showed reduced zinc and cadmium resistance but had no influence on copper resistance. In greenhouse studies, R. pseudoacacia inoculated with A. tumefaciens CCNWGS0286 displayed a significant increase in biomass production over that without inoculation, even in a zinc-contaminated environment. Interestingly, the differences in plant biomass improvement among A. tumefaciens CCNWGS0286, A. tumefaciens C58, and zinc-sensitive mutants 12-2 (zntA::Tn5) and 15-6 (low IAA production) revealed that phytohormones, rather than genes encoding zinc resistance determinants, were the dominant factor in enhancing plant growth in contaminated soil. P lant-growth-promoting bacteria (PGPB) play a key role in host plant adaptation to metal-contaminated environments through triggering physiological changes in plant cell metabolism so that growing plants can tolerate high concentrations of transition or heavy metals (7,26). PGPB have been isolated from various plants in heavy-metal-contaminated environments (3, 47-49). They were able to enhance plant growth, make plants more tolerant to heavy and transition metals, and thus accelerate phytoremediation by mechanisms including nitrogen fixation, nitrogen and phosphorus metabolism, and the production of siderophores, organic acids, 1-aminocyclopropane-1-carboxylate deaminase (ACC), and phytohormones such as indole-3-acetic acid (IAA), cytokinins, acetoin, and 2,3-butanediol (21, 41, 54). It was reported previously that the existence of high concentrations of metals selected for more metal resistant PGPB to resist these adverse environmental conditions (20,26). However, it is often not known which trait of the PGPB, e.g., tolerance to heavy and transition metals, phytohormones, or a combination of the two, plays the dominant role in the survival of a given plant in a metal-contaminated environment.Agrobacterium tumefaciens is a soilborne alphaproteobacterium belonging to the family Rhizobiaceae whose ability to induce crown gall tumors on dicotyledonous plants makes it of great concern worldwide. Recently, many nonpath...

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Section: Discussionmentioning

confidence: 99%

Genome Sequence and Mutational Analysis of Plant-Growth-Promoting Bacterium Agrobacterium tumefaciens CCNWGS0286 Isolated from a Zinc-Lead Mine Tailing

Hao

Xie

Johnstone

et al. 2012

Appl Environ Microbiol

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“…These endophytic bacterial isolates belonged to four different genera Bacillus, Pantoea, Serratia and Enterobacter. These strains previously reported as endophytes in different plant species like Bacillus aerius from Spharanthus indicus [22], Pantoea agglomerans from citrus [23], Serratia nematodiphila from Solanum nigrum [24], Enterobacter sp. from Curcuma longa L [25].…”

Section: Discussionmentioning

confidence: 99%

CULTURABLE ENDOPHYTIC BACTERIA FROM HALOTOLERANT Salvadora persica L.: SCREENING, ISOLATION AND PLANT GROWTH PROMOTING TRAITS

Abbas¹,

Patel²

2018

BIOP

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“…Similar to PGPR, plant growth-promoting endophytes (PGPE) can also assist their host plants in improving plant growth and increase heavy metal availability to the plant through several mechanisms including the production of plant growth-promoting substances such as IAA, ACC deaminase, siderophores, and organic acids, or by phosphate solubilization (Saravanan et al, 2007;Ryan et al, 2008;Long et al, 2011). Besides, many endophytes are also capable of living outside plant tissue and have similar or more plant growth-promoting activity than rhizosphere bacteria (Chen et al, 2010b). Research has uncovered the role of endophytic bacteria in phytoextraction of Cd.…”

Section: Article In Pressmentioning

confidence: 99%

Soil Biogeochemistry, Plant Physiology, and Phytoremediation of Cadmium-Contaminated Soils

Yang

et al. 2015

Advances in Agronomy

168

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Application of plant growth-promoting endophytes (PGPE) isolated from Solanum nigrum L. for phytoextraction of Cd-polluted soils

Cited by 170 publications

References 52 publications

Genome Sequence and Mutational Analysis of Plant-Growth-Promoting Bacterium Agrobacterium tumefaciens CCNWGS0286 Isolated from a Zinc-Lead Mine Tailing

Genome Sequence and Mutational Analysis of Plant-Growth-Promoting Bacterium Agrobacterium tumefaciens CCNWGS0286 Isolated from a Zinc-Lead Mine Tailing

CULTURABLE ENDOPHYTIC BACTERIA FROM HALOTOLERANT Salvadora persica L.: SCREENING, ISOLATION AND PLANT GROWTH PROMOTING TRAITS

Soil Biogeochemistry, Plant Physiology, and Phytoremediation of Cadmium-Contaminated Soils

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