Micromonospora metallophores: A plant growth promotion trait useful for bacterial-assisted phytoremediation?

Ortúzar, Maite; Trujillo, Martha E.; Román‐Ponce, Brenda; Carro, Lorena

doi:10.1016/j.scitotenv.2020.139850

Cited by 23 publications

(26 citation statements)

References 51 publications

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“…The plant experiments showed that B. pseudomuscari C6 not only promoted oat growth but also reduced the entry of copper ions into oat seedlings by 90%. It was consistent with the previous report that endophyte Micromonospora could promote Arabidopsis growth under the stress of multiple heavy metals (Ortuzar et al, 2020). The inhibition of Cu 2+ into oat seedling by B. pseudomuscari C6 was much higher than that (19%-41%) reported for B. subtilis to reduce the entry of Cu 2+ into lettuce (Wang, Dong, et al, 2020).…”

Section: Discussionsupporting

confidence: 92%

The capability of Bacillus pseudomycoides from soil to remove Cu(II) in water and prevent it from entering plants

Zhao

et al. 2022

Journal of Applied Microbiology

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Aims:Copper ion is widespread in wastewater and threatens the condition and human health. Micro-organisms have unique advantages to remove heavy-metal ions from water, but are rarely reported in the removal of copper ion. This aims to develop micro-organisms that can remove copper ion in water, characterize their properties and analyse their potential application in practice. Methods and Results:Sewage sludge was used as the source to isolate wild bacteria that can remove copper ion in water. The most efficient strain was screened out from 23 obtained isolates, identified as Bacillus pseudomycoides and coded as C6.The properties of C6 in the removal of copper ion in water were investigated in the aspects of reaction conditions, reaction groups, reaction dynamic and the application in oat planting. The reaction at pH 7 within 10 min yielded the highest removal rate of copper ion, 83%. The presence of lead ion in the reaction system could promote the removal rate of copper ion. Carboxyl groups and amidogen of C6 biomass were mainly involved in the removal of copper ion. The removal of copper ion was in accord with single-layer adsorption and Langmuir adsorption isotherm model. In application, C6 biomass reduced the copper content in the oat seedlings grown in copper ion containing water by more than seven times. Conclusions: B. pseudomycoides C6 can efficiently remove copper ion in water andinhibit it from entering plants. Significance and Impact of Study:This is the first time to report the capability of B. pseudomycoides to remove copper ion in water, which is also more efficient than the currently reported chemical and biological methods.

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Section: Discussionsupporting

confidence: 92%

The capability of Bacillus pseudomycoides from soil to remove Cu(II) in water and prevent it from entering plants

Zhao

et al. 2022

Journal of Applied Microbiology

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“…Bacillales consisted of Bacillus genus , which produces spores for survival under saline stress conditions 56 , 57 , is also capable of producing rhizosheath made up of EPS around plant roots and confer salinity resistance by excluding Na + ions from plant roots 55 . Another saline groundwater irrigation specific order detected was Micromonosporales represented by Micromonospora genus, which is known to perform complex polysaccharide degradation 58 , mobilize nutrients for the plant through metallophores 59 and perform plant growth promotion through aminocyclopropane-1-carboxylic acid (ACC) deaminase activity 60 . The Micromonospora is also reported to contain genes related to osmotic stress tolerance ( betC and proU ) and plant growth promotion (indole-3-glycerol phosphate synthase) 61 .…”

Section: Discussionmentioning

confidence: 99%

Salinity of irrigation water selects distinct bacterial communities associated with date palm (Phoenix dactylifera L.) root

Shamim

Loganathachetti

Chandran

et al. 2022

Sci Rep

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Saline water irrigation has been used in date palm (Phoenix dactylifera L.) agriculture as an alternative to non-saline water due to water scarcity in hyper-arid environments. However, the knowledge pertaining to saline water irrigation impact on the root-associated bacterial communities of arid agroecosystems is scarce. In this study, we investigated the effect of irrigation sources (non-saline freshwater vs saline groundwater) on date palm root-associated bacterial communities using 16S rDNA metabarcoding. The bacterial richness, Shannon diversity and evenness didn’t differ significantly between the irrigation sources. Soil electrical conductivity (EC) and irrigation water pH were negatively related to Shannon diversity and evenness respectively, while soil organic matter displayed a positive correlation with Shannon diversity. 40.5% of total Operational Taxonomic Units were unique to non-saline freshwater irrigation, while 26% were unique to saline groundwater irrigation. The multivariate analyses displayed strong structuring of bacterial communities according to irrigation sources, and both soil EC and irrigation water pH were the major factors affecting bacterial communities. The genera Bacillus, Micromonospora and Mycobacterium were dominated while saline water irrigation whereas contrasting pattern was observed for Rhizobium, Streptomyces and Acidibacter. Taken together, we suggest that date-palm roots select specific bacterial taxa under saline groundwater irrigation, which possibly help in alleviating salinity stress and promote growth of the host plant.

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“…Thus, the ability of M. chalcea CMU55-4 to produce siderophores may help this strain to enter and live inside plant cells. Metallophores producing Micromonospora strains were recently reported to promote the growth of Arabidopsis thaliana under heavy metal condition by playing roles in metal acquisition, iron metabolism and resistance to toxic compounds ( Ortúzar et al, 2020 ). Genes mutually found in Ortúzar et al (2020) and this study are ferric hydroxamate ABC transporter (FhuB, FhuC, FhuD), siderophore desferrioxamine E (DesA, DesB, DesC, DesD), and siderophore aerobactin (FhuB, FhuC, FhuD).…”

Section: Discussionmentioning

confidence: 99%

Bryophytes Harbor Cultivable Actinobacteria With Plant Growth Promoting Potential

et al. 2020

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This study was designed to investigate the cultivable actinobacteria associated with bryophytes and their plant growth promoting ability. Thirteen actinobacteria were isolated and tested for their ability to promote growth of plant in vitro and in planta . All isolates were able to produce IAA and siderophores. Six isolates were identified as members of the genus Micromonospora . Five isolates belonged to the genus Streptomyces and one each of Microbispora and Mycobacterium . Micromonospora sp. CMU55-4 was inoculated to rare moss [ Physcomitrium sphaericum (C. Ludw.) Fürnr.] and could increase the amount of carotenoid, fresh weight, and dry weight of this moss. In addition, this strain promoted capsule production, and rescued P. sphaericum ’s gametophytes during acclimatization to land. Strain CMU55-4 was identified as Micromonospora chalcea based on whole genome sequence analysis. Its plant growth promoting potential was further characterized through genome mining. The draft genome size was 6.6 Mb (73% GC). The genome contained 5,933 coding sequences. Functional annotation predicted encoded genes essential for siderophore production, phosphate solubilization that enable bacteria to survive under nutrient limited environment. Glycine-betaine accumulation and trehalose biosynthesis also aid plants under drought stress. M. chalcea CMU55-4 also exhibited genes for various carbohydrate metabolic pathways indicating those for efficient utilization of carbohydrates inside plant cells. Additionally, predictive genes for heat shock proteins, cold shock proteins, and oxidative stress such as glutathione biosynthesis were identified. In conclusion, our results demonstrate that bryophytes harbor plant growth promoting actinobacteria. A representative isolate, M. chalcea CMU55-4 promotes the growth of P. sphaericum moss and contains protein coding sequences related to plant growth promoting activities in its genome.

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Micromonospora metallophores: A plant growth promotion trait useful for bacterial-assisted phytoremediation?

Cited by 23 publications

References 51 publications

The capability of Bacillus pseudomycoides from soil to remove Cu(II) in water and prevent it from entering plants

The capability of Bacillus pseudomycoides from soil to remove Cu(II) in water and prevent it from entering plants

Salinity of irrigation water selects distinct bacterial communities associated with date palm (Phoenix dactylifera L.) root

Bryophytes Harbor Cultivable Actinobacteria With Plant Growth Promoting Potential

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