scholarly journals Plant Growth Stimulation by Microbial Consortia

Agronomy ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 219
Author(s):  
Gustavo Santoyo ◽  
Paulina Guzmán-Guzmán ◽  
Fannie Isela Parra-Cota ◽  
Sergio de los Santos-Villalobos ◽  
Ma. del Carmen Orozco-Mosqueda ◽  
...  
Keyword(s):  
Plant Growth ◽  
Abiotic Stress Tolerance ◽  
Growth Stimulation ◽  
Microbial Consortia ◽  
Plant Growth Promoting Bacteria ◽  
Biotic And Abiotic Stress ◽  
Beneficial Effects ◽  
Plant Growth Stimulation ◽  
Plant Growth Promoting ◽  
Multiple Species

Plant-associated microorganisms play an important role in agricultural production. Although various studies have shown that single microorganisms can exert beneficial effects on plants, it is increasingly evident that when a microbial consortium—two or more interacting microorganisms—is involved, additive or synergistic results can be expected. This occurs, in part, due to the fact that multiple species can perform a variety of tasks in an ecosystem like the rhizosphere. Therefore, the beneficial mechanisms of plant growth stimulation (i.e., enhanced nutrient availability, phytohormone modulation, biocontrol, biotic and abiotic stress tolerance) exerted by different microbial players within the rhizosphere, such as plant-growth-promoting bacteria (PGPB) and fungi (such as Trichoderma and Mycorrhizae), are reviewed. In addition, their interaction and beneficial activity are highlighted when they act as part of a consortium, mainly as mixtures of different species of PGPB, PGPB–Mycorrhizae, and PGPB–Trichoderma, under normal and diverse stress conditions. Finally, we propose the expansion of the use of different microbial consortia, as well as an increase in research on different mixtures of microorganisms that facilitate the best and most consistent results in the field.

scholarly journals Isolation and selection of plant growth-promoting bacteria associated with sugarcane

2016 ◽  
Vol 46 (2) ◽  
pp. 149-158 ◽  
Author(s):  
Ariana Alves Rodrigues ◽  
Marcus Vinicius Forzani ◽  
Renan de Souza Soares ◽  
Sergio Tadeu Sibov ◽  
José Daniel Gonçalves Vieira
Keyword(s):  
Plant Growth ◽  
Growth Promotion ◽  
Vital Role ◽  
Plant Growth Promoting Bacteria ◽  
Biotic And Abiotic Stress ◽  
Phosphate Solubilizers ◽  
Chitinase A ◽  
Plant Growth Promoting ◽  
Promote Plant Growth ◽  
Growth Promoting

ABSTRACT Microorganisms play a vital role in maintaining soil fertility and plant health. They can act as biofertilizers and increase the resistance to biotic and abiotic stress. This study aimed at isolating and characterizing plant growth-promoting bacteria associated with sugarcane, as well as assessing their ability to promote plant growth. Endophytic bacteria from leaf, stem, root and rhizosphere were isolated from the RB 867515 commercial sugarcane variety and screened for indole acetic acid (IAA) production, ability to solubilize phosphate, fix nitrogen and produce hydrogen cyanide (HCN), ammonia and the enzymes pectinase, cellulase and chitinase. A total of 136 bacteria were isolated, with 83 of them presenting some plant growth mechanism: 47 % phosphate solubilizers, 26 % nitrogen fixers and 57 % producing IAA, 0.7 % HCN and chitinase, 45 % ammonia, 30 % cellulose and 8 % pectinase. The seven best isolates were tested for their ability to promote plant growth in maize. The isolates tested for plant growth promotion belong to the Enterobacteriaceae family and the Klebsiella, Enterobacter and Pantoea genera. Five isolates promoted plant growth in greenhouse experiments, showing potential as biofertilizers.

scholarly journals Plant-Growth-Promoting Bacteria Mitigating Soil Salinity Stress in Plants

2020 ◽  
Vol 10 (20) ◽  
pp. 7326
Author(s):  
Stefan Shilev
Keyword(s):  
Plant Growth ◽  
Salinity Stress ◽  
Soil Salinity ◽  
Soil Salinization ◽  
Plant Growth Promoting Bacteria ◽  
Plant Tolerance ◽  
Beneficial Effects ◽  
Negative Effect ◽  
Plant Growth Promoting ◽  
Growth Promoting

Soil deterioration has led to problems with the nutrition of the world’s population. As one of the most serious stressors, soil salinization has a negative effect on the quantity and quality of agricultural production, drawing attention to the need for environmentally friendly technologies to overcome the adverse effects. The use of plant-growth-promoting bacteria (PGPB) can be a key factor in reducing salinity stress in plants as they are already introduced in practice. Plants having halotolerant PGPB in their root surroundings improve in diverse morphological, physiological, and biochemical aspects due to their multiple plant-growth-promoting traits. These beneficial effects are related to the excretion of bacterial phytohormones and modulation of their expression, improvement of the availability of soil nutrients, and the release of organic compounds that modify plant rhizosphere and function as signaling molecules, thus contributing to the plant’s salinity tolerance. This review aims to elucidate mechanisms by which PGPB are able to increase plant tolerance under soil salinity.

scholarly journals Isolation of Bacteria from Rhizosphere, Phylloplane and Caulosphere of Brinjal (Solanum melongena L.)

2021 ◽  
Vol 8 (6) ◽  
pp. 15-19
Author(s):  
Jennifer Lolitha C. ◽  
Manjula A. C. ◽  
Prathibha K. Y. ◽  
Keshamma E.
Keyword(s):  
Plant Growth ◽  
Solanum Melongena ◽  
Growth Media ◽  
Plant Growth Promoting Bacteria ◽  
Vegetable Crops ◽  
Beneficial Effects ◽  
Moderate Growth ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Growth Of Bacteria

Rhizosphere, phylloplane and caulosphere is the region where a complex community of microbes, mainly bacteria and fungi are present. The microbe- plant interaction in these regions can be beneficial, neutral, variable, or deleterious for plant growth. The bacteria that exert beneficial effects on plant development are termed plant growth promoting bacteria. To isolate the bacteria from rhizosphere, phylloplane and caulosphere of brinjal (Solanum melongena L.). The seeds of 16 cultivars of brinjal (Solanum melongena L.) viz., Arka keshav, Arka shirish, Arka kusumaker, and IIHR accession numbers 389,386,387,377 Tc, BB44, 391, 433, 434, 427, 447, 448, 476 and 487 that were used in the initial screening experiment were obtained from the Department of Vegetable crops, IIHR, Hessaraghatta, Bangalore. Brinjal (Solanum melongena L.) plants of different varieties were collected from seven locations around Bangalore viz., Hessaraghatta, Yelahanka, Kengeri, Madi vala, Hebbal, Tirumalapura and Attibele were also screened for the presence of associative bacteria. Associative microorganisms isolated from the rhizosphere, phylloplane and shoot regions of brinjal (Solanum melongena L.), revealed the presence of three morphologically different colonies. 80% of 16 cultivars of the brinjal (Solanum melongena L.) screened showed the presence of associative bacterial colonies. In this study diazotrophic BBI were obtained from the rhizoplane, phylloplane and stem of 16 cultivars of brinjal (Solanum melongena L.) that were screened. The dominant pearl-colored colonies isolated from all varieties of brinjal plants that were screened was identified and showed maximum nitrogen fixing ability compared with that of the other colonies. The phylloplane of brinjal (Solanum melongena L.) plants from seven different locations around Bangalore showed the presence of the dominant pearl-colored colonies.  Moderate growth of bacteria was observed in root, stem and leaf bits sterilized up to 35 minutes. Even on surface sterilized roots which were homogenized and inoculated on growth media, dense growth of bacteria was observed there by establishing the presence of bacteria inside the root system. For the first time the presence of growth promoting bacteria on the rhizosphere and endorhizosphere of brinjal (Solanum Melongena L.) cultivars was established.

scholarly journals Colonization and beneficial effects on annual ryegrass by mixed inoculation with plant growth promoting bacteria

2017 ◽  
Vol 198 ◽  
pp. 47-55 ◽  
Author(s):  
Nádia L. Castanheira ◽  
Ana Catarina Dourado ◽  
Isabel Pais ◽  
José Semedo ◽  
Paula Scotti-Campos ◽  
...  
Keyword(s):  
Plant Growth ◽  
Plant Growth Promoting Bacteria ◽  
Annual Ryegrass ◽  
Beneficial Effects ◽  
Plant Growth Promoting ◽  
Growth Promoting

scholarly journals Establishing and Quantifying the Phosphate Solubilizing Potential of the Brinjal Bacterial Isolate

2021 ◽  
Vol 10 (11) ◽  
pp. 83-88
Author(s):  
C. Jenifer Lolita A. C. Manjula ◽  
E. Keshamma
Keyword(s):  
Plant Growth ◽  
Bacterial Isolate ◽  
Nitrogenase Activity ◽  
Solanum Melongena ◽  
Steady Increase ◽  
Plant Growth Promoting Bacteria ◽  
Phosphate Solubilizing Bacteria ◽  
Beneficial Effects ◽  
Plant Growth Promoting ◽  
Phosphate Solubilizing

Rhizosphere, phylloplane and caulosphere is the region where a complex community of microbes, mainly bacteria and fungi are present. The microbe plant interaction in these regions can be beneficial, neutral, variable, or deleterious for plant growth. The bacteria that exert beneficial effects on plant development are termed plant growth promoting bacteria. To quantify the amount of phosphate solubilizing bacteria from rhizosphere, phylloplane and caulosphere of brinjal (Solanum melongena L.). Materials and methods: Brinjal (Solanum melongena L.) plants of different varieties were collected from seven locations around Bangalore viz., Hessaraghatta, Yelahanka, Kengeri, Madi vala, Hebbal, Tirumalapura and Attibele were also screened for the presence of phosphate solubilizing bacteria. Nitrogenase activity was estimated by acetylene reduction assay and analyzed by gas chromatography. The amount of nitrogen fixed brinjal bacterial isolate was quantified by micro Kjeldhal method. The amount of nitrogen fixed by the BBI was equivalent to 23.5 nm of C2H2 reduced/tube/hour. The amount of nitrogen fixed by the BBI showed a steady increase upto three days (75 nm of C2H2 reduced/tube/hour) after which there was a decline in the amount of nitrogen fixed by the microbe. Phosphate solubilization by the bacteria isolated from brinjal is highly beneficial to the crop, as it would always make more phosphate available to the crop. This phosphate solubilizing potential could be harnessed to reduce the input of inorganic fertilizers. For the first time the presence of phosphate solubilizing bacteria on the rhizosphere and endorhizosphere of brinjal (Solanum Melongena L.) cultivars was established.

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

2019 ◽  
Vol 7 (11) ◽  
pp. 519 ◽  
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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