Phytostimulatory effect of indole-3-acetic acid by Enterobacter cloacae SN19 isolated from Teramnus labialis (L. f.) Spreng rhizosphere

Bose, Anjali; Kher, Mafatlal M.; Nataraj, M.; Keharia, Haresh

doi:10.1016/j.bcab.2016.03.005

Cited by 12 publications

(12 citation statements)

References 47 publications

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“…The results were in accordance with those reported by Vaikuntapu et al . Rhizobacterial isolates exhibiting multiple PGP activities have been reported to considerably enhance the growth of different crop plants .…”

Section: Discussionsupporting

confidence: 93%

Population densities of indigenous Acidobacteria change in the presence of plant growth promoting rhizobacteria (PGPR) in rhizosphere

et al. 2017

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Rhizosphere microbial community has diverse metabolic capabilities and plays a crucial role in maintaining plant health. Oligotrophic plant growth promoting rhizobacteria (PGPR), along with difficult-to-culture microbial fractions, might be involved synergistically in microbe-microbe and plant-microbe interactions in the rhizosphere. Among the difficult-to-culture microbial fractions, Acidobacteria constitutes the most dominant phylum thriving in rhizospheric soils. We selected effective PGPR for tomato and black gram and studied their effect on population densities of acidobacterial members. Three facultatively oligotrophic PGPR were identified through 16S rRNA gene sequencing as Sphingobacterium sp. (P3), Variovorax sp. (P4), and Roseomonas sp. (A2); the latter being a new report of PGPR. In presence of selected PGPR strains, the changes in population densities of Acidobacteria were monitored in metagenomic DNA extracted from bulk and rhizospheric soils of tomato and black gram using real time qPCR. A gradual increase in equivalent cell numbers of Acidobacteria members was observed over time along with a simultaneous increase in plant growth promotion by test PGPR. We report characterization of three effective PGPR strains and their effects on indigenous, underexplored difficult-to-culture phylum-Acidobacteria. We suggest that putative interactions between these two bacterial groups thriving in rhizospheric soils could be beneficial for plant growth.

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Section: Discussionsupporting

confidence: 93%

Population densities of indigenous Acidobacteria change in the presence of plant growth promoting rhizobacteria (PGPR) in rhizosphere

et al. 2017

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“…Regarding IAA production, this bacterium showed a higher level of IAA when compared to previous reports on IAA production by Enterobacter (Inui-Kishi et al 2012;Ghosh et al 2015;Bose et al 2016). IAA production by Enterobacter sp.…”

Section: Discussionmentioning

confidence: 39%

“…In a similar previous study, Enterobacter spp.-i.e. Enterobacter asburiae (Abraham and Silambarasan 2015), Enterobacter cancerogenus (Jha et al 2012), and Enterobacter cloacae (Abraham and Silambarasan 2015;Bose et al 2016)support plant growth and is considered to be a plant growth promoting bacteria. Furthermore, Enterobacter sp.…”

Section: Discussionmentioning

confidence: 99%

“…E. cloacae SN19 produced IAA after 6 h of incubation (about 25 mg l -1 ) and this increased to about 190 mg l -1 after the first day. The maximum IAA (382.2 mg l -1 ) was reached after 3 days of incubation (Bose et al 2016). In addition, Inui-Kishi et al (2012) studied IAA production at different incubation times in four plant growth-promoting rhizobacteria.…”

Section: Discussionmentioning

confidence: 99%

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High-yield production of indole-3-acetic acid by Enterobacter sp. DMKU-RP206, a rice phyllosphere bacterium that possesses plant growth-promoting traits

2017

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sp. DMKU-RP206 was isolated from rice leaves in Thailand and identified by the 16S rRNA gene and multilocus sequence (, , and genes) analysis. The bacterium was assessed on plant growth-promoting traits including indole-3-acetic acid (IAA) production. Phosphate solubilization, ammonia production, and antagonism to fungal plant pathogens, as well as siderophore production, were shown by this bacterium. However, only IAA production was focused on. The production of IAA by sp. DMKU-RP206 was optimized by statistical methods. A Box-Behnken design was used for the investigation of interactions among the basic influencing factors and for the optimization of IAA production. The results showed that l-tryptophan had a significant importance in terms of IAA production. sp. DMKU-RP206 produced a higher amount of IAA than previously reported for the genus. 0.85% of lactose as a carbon source, 1.3% of yeast extract as a nitrogen source, 1.1% of l-tryptophan as a precursor, 0.4% of NaCl, an initial pH of 5.8, an incubation temperature at 30 °C, and a shaking speed of 200 rpm were found to be the optimum conditions for IAA production. In addition, IAA production was performed to scale up IAA production, and the highest amount, 5561.7 mg l, was obtained. This study reported a 13.4-fold improvement in IAA production by sp. DMKU-RP206.

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“…CzDA medium was supplemented with methyl red as an indicator for acid production, changing in colour from yellowish orange to pink (acid). This simple and rapid technique, modified from Bose et al [16], was used to screen for the fungal isolates that were the most promising in producing citric acid. An index to measure the capacity of fungal isolates to produce citric acid was formulated using as variables the colony diameter after two days and colour-change (pink) diameter surrounding the colony:…”

Section: Methodsmentioning

confidence: 99%

Isolation of citric acid-producing Aspergillus niger from soil and organic wastes

Zakry

Syahidah

Malahubban

et al. 2020

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Introduction of new Aspergillus niger strains that are more productive than those currently in use is one of the important steps in promoting more effective commercial citric acid production. The present study was conducted to isolate and characterise indigenous A. niger from selected soil and organic wastes such as soil with buried bamboo, soil with bamboo on the surface, soil under cattle grazing, mango orchard soil, rotting plum fruit and rotting bread. Morphological identification of A. niger was based on the length and width of the conidiophores, vesicles, phialides, and spores. Citric acid-producing Aspergillus isolates were screened based on the citric acid production index. The present study found that the highest fungal spore counts (3.35±0.15 x 107 spores/g sample) were obtained from soil under cattle grazing, as were the highest A. niger counts (7.25±0.05 x 106 spores/g sample). The lowest total fungal counts came from rotting plum fruit (4.70±0.10 x 105 spores/g sample). A total of 14 isolates were collected, with five (NSA03, NSA06, NSA09, NSA12, and NSA14) showing morphological similarities with the reference isolate, A. niger Tiegh. All isolates were able to produce citric acid, but with varying efficiencies according to their citric acid production indices. The soil under cattle grazing area found to be the best site for sampling and isolation for citric acid-producing A. niger by using Czapek-Dox as a medium of isolation.

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Phytostimulatory effect of indole-3-acetic acid by Enterobacter cloacae SN19 isolated from Teramnus labialis (L. f.) Spreng rhizosphere

Cited by 12 publications

References 47 publications

Population densities of indigenous Acidobacteria change in the presence of plant growth promoting rhizobacteria (PGPR) in rhizosphere

Population densities of indigenous Acidobacteria change in the presence of plant growth promoting rhizobacteria (PGPR) in rhizosphere

High-yield production of indole-3-acetic acid by Enterobacter sp. DMKU-RP206, a rice phyllosphere bacterium that possesses plant growth-promoting traits

Isolation of citric acid-producing Aspergillus niger from soil and organic wastes

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