Production of Indole Acetic Acid and Plant Growth Promotion by Rhizobacteria from a Less Studied Marine Ecosystem

2014 ◽  
Vol 11 (SE) ◽  
pp. 179-185 ◽  
Author(s):  
M. Jayaprakashvel ◽  
V. Kiran Kumar ◽  
Jainul Abideen ◽  
Swarnakala Swarnakala ◽  
M. Venkatramani ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Plant Growth ◽  
Plant Growth Promotion ◽  
Indole Acetic Acid ◽  
Growth Promotion ◽  
Marine Ecosystem

scholarly journals Characterization of streptomycetes with potential to promote plant growth and biocontrol

2008 ◽  
Vol 65 (1) ◽  
pp. 50-55 ◽  
Author(s):  
Carla da Silva Sousa ◽  
Ana Cristina Fermino Soares ◽  
Marlon da Silva Garrido
Keyword(s):  
Acetic Acid ◽  
Plant Growth ◽  
Plant Growth Promotion ◽  
Indole Acetic Acid ◽  
Extracellular Enzymes ◽  
Root Colonization ◽  
Phosphate Solubilization ◽  
Culture Media ◽  
Growth Promotion ◽  
Salinity Levels

Studies with streptomycetes in biocontrol programs and plant growth promotion are presented as technological alternatives for environmental sustainable production. This work has the objective of characterizing six isolates of streptomycetes aiming the production of extracellular enzymes, indole acetic acid, capacity for phosphate solubilization, root colonization and growth under different pH and salinity levels. For detection of enzyme activity the isolates were grown in culture media with the enzyme substrates as sole carbon source. The root colonization assay was performed on tomato seedlings grown on 0.6% water-agar medium. Growth under different pH and salinity levels was evaluated in AGS medium with 1%, 1.5%, 2%, 2.5%, and 3% NaCl, and pH levels adjusted to 5.0, 5.5, 6.0, 6.5, and 7.0. All isolates produced the enzymes amylase, catalase, and lipase, as well as indole acetic acid. With one exception (AC-92), all isolates presented cellulolytic and chitinolytic activity, and only AC-26 did not show xylanolytic activity. The isolates AC-147, AC-95, and AC-29 were the highest producers of siderophores. The isolates AC-26 and AC-29 did not show capacity for phosphate solubilization. All isolates colonized tomato roots in vitro, and AC-92 grew under all pH and salinity levels tested. The streptomycetes tested were considered as potential biocontrol and plant growth promotion agents.

scholarly journals Rhizospheric Fungi to Plant Growth Promotion: A Review

2021 ◽  
Vol 9 (1) ◽  
pp. 411
Author(s):  
João Manoel da Silva ◽  
Yamina Coentro Montaldo ◽  
Arthur Costa Pereira Santiago de Almeida ◽  
Viviane Araújo Dalbon ◽  
Juan Pablo Molina Acevedo ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Plant Growth ◽  
Growth Regulators ◽  
Indole Acetic Acid ◽  
Growth Promotion ◽  
Direct Influence ◽  
Biological Interactions ◽  
Ecological Role ◽  
And Control ◽  
Stimulation Of

The rhizosphere is the region that has direct influence from the roots. This is the place where most of the interactions between microorganisms and plants occur. Studies involving the ecology of microbial communities from the rhizosphere became more frequent after the first reports of biological interactions of microorganisms with plants that influence physically and chemically modify the soil surrounding. According to these hypotheses, the rhizosphere mycobiota provides the development of plants through various mechanisms, direct and indirect. Thus, the objective of this review was to explain the aspects that provide characterizing these microorganisms as beneficial to plants in view of their applicability to agro-ecosystems. Therefore, it is stated that rhizospheric fungi have the solubilization of phosphorus (P), assimilating this nutrient for plants, promoting growth through the production or stimulation of the production of growth regulators such as 3-indole acetic acid, and control of phytopathogenic agents such as other filamentous fungi, and also phytonemamatodes. Therefore, it is possible to observe the importance of the constant observance of the action of these microorganisms in terms of their ecological role due to the agro-ecosystem.

scholarly journals Plant Growth Promotion Rhizobacteria in Onion Production

2014 ◽  
Vol 63 (1) ◽  
pp. 83-88 ◽  
Author(s):  
JOSIP ČOLO ◽  
TIMEA I. HAJNAL-JAFARI ◽  
SIMONIDA ĐURIĆ ◽  
DRAGANA STAMENOV ◽  
SAUD HAMIDOVIĆ
Keyword(s):  
Acetic Acid ◽  
Bacillus Subtilis ◽  
Plant Growth ◽  
Pseudomonas Fluorescens ◽  
Indole Acetic Acid ◽  
Growth Promotion ◽  
Azotobacter Chroococcum ◽  
Growth And Yield ◽  
Rhizospheric Bacteria ◽  
Number Of Bacteria

The aim of the research was to examine the effect of rhizospheric bacteria Azotobacter chroococcum, Pseudomonas fluorescens (strains 1 and 2) and Bacillus subtilis on the growth and yield of onion and on the microorganisms in the rhizosphere of onion. The ability of microorganisms to produce indole-acetic acid (IAA), siderophores and to solubilize tricalcium phosphate (TCP) was also assessed. The experiment was conducted in field conditions, in chernozem type of soil. Bacillus subtilis was the best producer of IAA, whereas Pseudomonas fluorescens strains were better at producing siderophores and solubilizing phosphates. The longest seedling was observed with the application of Azotobacter chroococcum. The height of the plants sixty days after sowing was greater in all the inoculated variants than in the control. The highest onion yield was observed in Bacillus subtilis and Azotobacter chroococcum variants. The total number of bacteria and the number of Azotobacter chroococcum were larger in all the inoculated variants then in the control. The number of fungi decreased in most of the inoculated variants, whereas the number of actinomycetes decreased or remained the same.

Isolation of Plant Growth Promoting Bacteria from the Rhizosphere of Different Plants and Assessment of Their Plant Growth Promotion Potential

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Anam Yousaf ◽  
Hassan Ahmed Khan ◽  
Tayyaba Younas
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Antibacterial Activity ◽  
Acetic Acid ◽  
Plant Growth ◽  
Indole Acetic Acid ◽  
Phosphate Solubilization ◽  
Growth Promotion ◽  
Plant Growth Promoting Bacteria ◽  
Growth Promoting

Plant are benefitted in different aspects by symbiotic bacteria. Environmental conditions, Plantconditions and type of pathogens determine these important services for plants Objective: Theresearch was conducted to assess the plant growth enhancing effects of wheat and cabbagerhizobacteria on the growth of wheat plant Methods: For this purpose, total 49 bacteria were isolatedand characterized from the rhizosphere of wheat and cabbage plants. The isolates were assessed forplant growth promoting properties such as: indole acetic acid production, phosphate solubilization,antibacterial activity and heavy metal resistance. Indole acetic acid was found to be produced by 7isolates and phosphate solubilization was shown by 20 isolates. Antibacterial activity was determinedagainst four clinical isolates like Staphylococcus aureus, Klebsiella sp., Escherichia coli and Pseudomonasaeruginosa Results: Antibacterial activity against Staphylococcus aureus was shown by 38 isolates, 12isolates showed antibacterial activity against Escherichia coli and Klebsiella sp., whereas no isolate wasfound to be positive against Pseudomonas aeruginosa. Another plant growth enhancing trait (heavymetal resistance) was shown by 28 rhizobacteria. In order to evaluate the capability of isolates toenhance the plant growth, bio-inoculation assay was performed using wheat seeds Conclusions:Rhizobacterial inoculation increased the number of roots, shoots, leaves and roots and shoot length ofwheat plantlets as compared to un-inoculated control.

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