Enhanced biodegradation of crude oil in soil by a developed bacterial consortium and indigenous plant growth promoting bacteria

The present work was aimed at investigating the effects of a four strains consortium—Azospirillum brasilense, Gluconacetobacter diazotrophicus, Herbaspirillum seropedicae, and Burkholderia ambifaria—on crops of Allium cepa L. and its soil health. The bacterial consortium was inoculated on seeds of two different onion varieties; inoculated seeds and control ones (treated with autoclaved inoculum) were sown in open-field and followed until harvest. Plant growth development parameters, as well as soil physico-chemical and molecular profiles (DNA extraction and 16S community sequencing on the Mi-Seq Illumina platform), were investigated. The results showed a positive influence of bacterial application on plant growth, with increased plant height (+18%), total chlorophylls (+42%), crop yields (+13%), and bulbs dry matter (+3%) than the control. The differences between control and treated experimental conditions were also underlined in the bulb extracts in terms of total phenolic contents (+25%) and antioxidant activities (+20%). Soil fertility and microbial community structure and diversity were also positively affected by the bacterial inoculum. At harvest, the soil with the presence of the bacterial consortium showed an increase of total organic carbon, organic matter, and available P and higher concentrations of nutrients than control. The ecological indexes calculated on the molecular profiles showed that community diversity was positively affected by the bacterial treatment. The present work allowed to remark the effective use of plant growth-promoting bacteria as a valid fertilization strategy to improve yield in productive landscapes, whilst safeguarding soil biodiversity.

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Indigenous plant growth-promoting bacteria enhance plant growth, biomass, and nutrient uptake in degraded forest plants

3 Biotech ◽

10.1007/s13205-018-1179-1 ◽

2018 ◽

Vol 8 (3) ◽

Cited By ~ 3

Author(s):

Parthasarathy Radhapriya ◽

Andimuthu Ramachandran ◽

Perumal Palani

Keyword(s):

Plant Growth ◽

Nutrient Uptake ◽

Plant Growth Promoting Bacteria ◽

Degraded Forest ◽

Indigenous Plant ◽

Plant Growth Promoting ◽

Growth Promoting ◽

Forest Plants

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Allium cepa L. Inoculation with a Consortium of Plant Growth-Promoting Bacteria: Effects on Plants, Soil, and the Autochthonous Microbial Community

Microorganisms ◽

10.3390/microorganisms9030639 ◽

2021 ◽

Vol 9 (3) ◽

pp. 639

Author(s):

Marika Pellegrini ◽

Daniela M. Spera ◽

Claudia Ercole ◽

Maddalena Del Gallo

Keyword(s):

Microbial Community ◽

Plant Growth ◽

Allium Cepa ◽

Bacterial Consortium ◽

Total Phenolic ◽

Plant Growth Promoting Bacteria ◽

Allium Cepa L ◽

Plant Growth Promoting ◽

Growth Promoting ◽

Molecular Profiles

The present work was aimed at investigating the effects of a four bacterial strain consortium—Azospirillum brasilense, Gluconacetobacter diazotrophicus, Herbaspirillum seropedicae, and Burkholderia ambifaria—on Allium cepa L. and on soil health. The bacterial consortium was inoculated on seeds of two different onion varieties; inoculated and Control seeds (treated with autoclaved inoculum) were sown in an open-field and followed until harvest. Plant growth development parameters, as well as soil physico–chemical and molecular profiles (DNA extraction and 16S community sequencing on the Mi-Seq Illumina platform), were investigated. The results showed a positive influence of bacterial application on plant growth, with increased plant height (+18%), total chlorophylls (+42%), crop yields (+13%), and bulb dry matter (+3%) with respect to the Control. The differences between Control and treatments were also underlined in the bulb extracts in terms of total phenolic contents (+25%) and antioxidant activities (+20%). Soil fertility and microbial community structure and diversity were also positively affected by the bacterial inoculum. At harvest, the soil with the presence of the bacterial consortium showed an increase in total organic carbon, organic matter, and available phosphorus, as well as higher concentrations of nutrients than the Control. The ecological indexes calculated from the molecular profiles showed that community diversity was positively affected by the bacterial treatment. The present work showed the effective use of plant growth-promoting bacteria as a valid fertilization strategy to improve yield in productive landscapes whilst safeguarding soil biodiversity.

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Bacterial Consortium for Improved Maize (Zea mays L.) Production

Microorganisms ◽

10.3390/microorganisms7110519 ◽

2019 ◽

Vol 7 (11) ◽

pp. 519 ◽

Cited By ~ 6

Author(s):

Oluwaseyi Samuel Olanrewaju ◽

Olubukola Oluranti Babalola

Keyword(s):

Plant Growth ◽

Growth Parameters ◽

Block Design ◽

Bacterial Consortium ◽

Microbial Consortia ◽

Plant Growth Promoting Bacteria ◽

Promoting Effect ◽

Maize Seeds ◽

Plant Growth Promoting ◽

Growth Promoting

The ever-increasing human population is a major concern for food security. Maize is the third largest most important food crop. The major problems of cultivation arise from urbanization and land pollution. This reduces the amount of land available for agriculture. The use of chemicals in agriculture is not environmentally friendly. Thus, plant growth-promoting bacteria (PGPB) have been proposed as alternatives. This study aims to test the growth-promoting effect of maize inoculated with six indigenous PGPB isolates. These isolates were assayed for various biochemical and plant growth-promoting activities. They were also assayed for biocontrol activities. Based on the results, six isolates viz A1, A18, A29, NWU4, NWU14, and NWU198 were used to inoculate maize seeds. The inoculated seeds were tried out on the field. A randomized block design was used. PGPB used were in single, consortia of two, and three organisms. The length of the leaves, roots, and stem, plant height, numbers of leaves, and weight of 100 seeds were taken at the fourth and eighth weeks after planting. Microbial consortia increased growth parameters compared to single inoculant treatments. Thus, they can be of advantage in the eradication of low yield. They can also serve as reliable alternatives to chemical fertilizers.

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Isolation and identification of plant growth-promoting bacteria associated with tall fescue

Proceedings of the New Zealand Grassland Association ◽

10.33584/jnzg.2009.71.2751 ◽

2009 ◽

pp. 211-216 ◽

Cited By ~ 5

Author(s):

J. Monk ◽

E. Gerard ◽

S. Young ◽

K. Widdup ◽

M. O'Callaghan

Keyword(s):

New Zealand ◽

Plant Growth ◽

Tall Fescue ◽

Festuca Arundinacea ◽

Plant Growth Promoting Bacteria ◽

Beneficial Bacteria ◽

Isolation And Identification ◽

Naturally Occurring ◽

Plant Growth Promoting ◽

Growth Promoting

Tall fescue (Festuca arundinacea) is a useful alternative to ryegrass in New Zealand pasture but it is slow to establish. Naturally occurring beneficial bacteria in the rhizosphere can improve plant growth and health through a variety of direct and indirect mechanisms. Keywords: rhizosphere, endorhiza, auxin, siderophore, P-solubilisation

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