“…Research progress in this area has broad applications beyond sustainable agriculture. For example, a future role for biological seed treatments in bioremediation has been demonstrated with seed applied microorganisms facilitating improved uptake of heavy metals from soil (Ma et al 2011 ; Aboudrar et al 2013 ). While the critical role of rhizosphere microbial communities in plant production is well recognised, there is growing potential to manipulate these rhizosphere communities to provide further solutions for nature conservation, development of bio-energy crops and mitigation of climate change (Philippot et al 2013 ).…”
Section: Discussionmentioning
confidence: 99%
“… Improved yield under semi-arid conditions Cowpea Charcoal:broth mix F Minaxi et al ( 2012 ) Bacillus pumilus , Micrococcus spp. Increased uptake of nickel from soil Alpine penny-cress (hyperaccumulator) Methylcellulose suspension L Aboudrar et al ( 2013 ) Trichoderma hazianum Alleviation of salinity stress Wheat, rice Bio-priming L Rawat et al ( 2011 , 2012 ) Alleviation of disease pressure and abiotic stress—osmotic, salinity, temperature Tomato Conidia coated onto cellulose and encapsulated with tapioca dextran L Mastouri et al ( 2010 ) Penicillium radicum , Penicillium bilaii Improved access to soil P Wheat, medic, lentil Aqueous spore suspension L, GH Wakelin et al ( 2007 ) Penicillium bilaii a Improved access to soil P Wheat, canola, corn Various proprietary formulations, seed treatment applied close to time of sowing F Monsanto BioAg ( 2016 ) L laboratory (including controlled growth chamber), GH glasshouse, F field trials a Available as commercial products Fig. 1 Properties of methods commonly used for microbial inoculation of seed …”
There is increasing interest in the use of beneficial microorganisms as alternatives to chemical pesticides and synthetic fertilisers in agricultural production. Application of beneficial microorganisms to seeds is an efficient mechanism for placement of microbial inocula into soil where they will be well positioned to colonise seedling roots and protect against soil-borne diseases and pests. However, despite the long history of inoculation of legume seeds with Rhizobia spp. and clear laboratory demonstration of the ability of a wide range of other beneficial microorganisms to improve crop performance, there are still very few commercially available microbial seed inoculants. Seed inoculation techniques used for research purposes are often not feasible at a commercial scale and there are significant technical challenges in maintaining viable microbial inocula on seed throughout commercial seed treatment processes and storage. Further research is needed before the benefits of a wide range of environmentally sensitive potential seed inoculants can be captured for use in agriculture, ecosystem restoration and bioremediation. There is no single solution to the challenge of improving the ability of seed inoculants to establish and function consistently in the field. Development of novel formulations that maintain the viability of both inoculant and seed during storage will result from multidisciplinary research in microbial and seed physiology and adjuvant chemistry.
“…Research progress in this area has broad applications beyond sustainable agriculture. For example, a future role for biological seed treatments in bioremediation has been demonstrated with seed applied microorganisms facilitating improved uptake of heavy metals from soil (Ma et al 2011 ; Aboudrar et al 2013 ). While the critical role of rhizosphere microbial communities in plant production is well recognised, there is growing potential to manipulate these rhizosphere communities to provide further solutions for nature conservation, development of bio-energy crops and mitigation of climate change (Philippot et al 2013 ).…”
Section: Discussionmentioning
confidence: 99%
“… Improved yield under semi-arid conditions Cowpea Charcoal:broth mix F Minaxi et al ( 2012 ) Bacillus pumilus , Micrococcus spp. Increased uptake of nickel from soil Alpine penny-cress (hyperaccumulator) Methylcellulose suspension L Aboudrar et al ( 2013 ) Trichoderma hazianum Alleviation of salinity stress Wheat, rice Bio-priming L Rawat et al ( 2011 , 2012 ) Alleviation of disease pressure and abiotic stress—osmotic, salinity, temperature Tomato Conidia coated onto cellulose and encapsulated with tapioca dextran L Mastouri et al ( 2010 ) Penicillium radicum , Penicillium bilaii Improved access to soil P Wheat, medic, lentil Aqueous spore suspension L, GH Wakelin et al ( 2007 ) Penicillium bilaii a Improved access to soil P Wheat, canola, corn Various proprietary formulations, seed treatment applied close to time of sowing F Monsanto BioAg ( 2016 ) L laboratory (including controlled growth chamber), GH glasshouse, F field trials a Available as commercial products Fig. 1 Properties of methods commonly used for microbial inoculation of seed …”
There is increasing interest in the use of beneficial microorganisms as alternatives to chemical pesticides and synthetic fertilisers in agricultural production. Application of beneficial microorganisms to seeds is an efficient mechanism for placement of microbial inocula into soil where they will be well positioned to colonise seedling roots and protect against soil-borne diseases and pests. However, despite the long history of inoculation of legume seeds with Rhizobia spp. and clear laboratory demonstration of the ability of a wide range of other beneficial microorganisms to improve crop performance, there are still very few commercially available microbial seed inoculants. Seed inoculation techniques used for research purposes are often not feasible at a commercial scale and there are significant technical challenges in maintaining viable microbial inocula on seed throughout commercial seed treatment processes and storage. Further research is needed before the benefits of a wide range of environmentally sensitive potential seed inoculants can be captured for use in agriculture, ecosystem restoration and bioremediation. There is no single solution to the challenge of improving the ability of seed inoculants to establish and function consistently in the field. Development of novel formulations that maintain the viability of both inoculant and seed during storage will result from multidisciplinary research in microbial and seed physiology and adjuvant chemistry.
“…These strains were found to exhibit different multiple heavy metal resistance characteristics to Ni, Cd, Co, Zn and Cr [30]. Aboudrar et al [31] also confirmed that, the NiRB strains could reduce the soil bioavailability of Ni and also induce promoting effects on the growth of plant. So, they stated that NiRB strains could serve as an effective metal-immobilizing and growth-promoting bioinoculant for plants in Ni-stressed soils [31].…”
BackgroundPollution due to the heavy metals is a problem that may have negative consequences on the hydrosphere. One of the best procedures in removing the toxic metals from the environment is using metal resistant bacteria.ResultsIn the present study eight nickel resistant bacteria were isolated from industrial wastewaters. Three of them were selected as the most resistant based on their Maximum tolerable concentration (8, 16 and 24 mM Ni2+). Their identification was done according to morphological, biochemical characteristics and 16SrDNA gene sequencing and they were identified as Cupriavidus sp ATHA3, Klebsiella oxytoca ATHA6 and Methylobacterium sp ATHA7. The accession numbers assigned to ATHA3, ATHA6 and ATHA7 strains are JX120152, JX196648 and JX457333 respectively. The Growth rate of the most resistant isolate, Klebsiella oxytoca strain ATHA6, in the presence of Ni2+ and the reduction in Ni2+ concentration was revealed that K oxytoca ATHA6 could decrease 83 mg/mL of nickel from the medium after 3 days.ConclusionIt can be concluded that the identified Ni resistant bacteria could be valuable for the bioremediation of Ni polluted waste water and sewage.
“…Moreover, S. alfredii , a kind of Cd/Zn hyperaccumulating plant, can tolerate higher metal concentrations with the assistance of bacteria [ 17 ]. The Ni-resistant rhizosphere bacteria could serve as an effective metal-immobilizing and growth-promoting bioinoculant for N. caerulescens [ 18 ]. Thus, the present study focused on the rhizosphere bacteria from C. hupingshanesis , and the special subjects are as follows: (1) Se-resistant bacteria were isolated from the rhizosphere of C. hupingshanesis ; (2) one of them was choose to investigate the selenite metabolic process.…”
A novel selenium- (Se-) hyperaccumulating plant, Cardamine hupingshanesis, accumulating Se as a form of SeCys2, was discovered in Enshi, Hubei, China, which could not be explained by present selenocysteine methyltransferase (SMT) theory. However, it is interesting to investigate if rhizosphere bacteria play some roles during SeCys2 accumulation. Here, one Se-tolerant rhizosphere strain, Microbacterium oxydans, was isolated from C. hupingshanesis. Phylogenetic analysis and 16S rRNA gene sequences determined the strain as a kind of Gram positive bacillus and belonged to the family Brevibacterium frigoritolerans. Furthermore, Se tolerance test indicated the strain could grow in extreme high Se level of 15.0 mg Se L−1. When exposed to 1.5 mg Se L−1, SeCys2 was the predominant Se species in the bacteria, consistent with the Se species in C. hupingshanesis. This coincidence might reveal that this strain played some positive effect in SeCys2 accumulation of C. hupingshanesis. Moreover, when exposed to 1.5 mg Se L−1 or 15.0 mg Se L−1, As absorption diminished in the logarithmic phase. In contrast, As absorption increased when exposed to 7.5 mg Se L−1, indicating As metabolism processes could be affected by Se on this strain. The present study provided a sight on the role of rhizosphere bacteria during Se accumulation for Se-hyperaccumulating plant.
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