Potential of Bacterial Endophytes as Plant Growth Promoting Factors

Chaturvedi, Himani; Singh, Vinod; Gupta, Govind

doi:10.4172/2157-7471.1000376

Cited by 62 publications

(40 citation statements)

References 50 publications

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“…Based on observation of morphology of the bacterial colony, five different types of bacterial colonies were detected in the soil samples. The microbial plates that contains a minimum of 30–300 bacterial colonies were only considered and counted 23 , 24 . From the experimental data, no significant difference in the CFU was observed among all the soil samples tested from different locations.…”

Section: Resultsmentioning

confidence: 99%

“…MH sites, which are in a similar geographical region as the AP sites also had high soil pH and EC which in turn showed high mahanine content in MK leaf. The soil microbiota also plays a crucial role in plant defense system and directly correlated with plant secondary metabolite formation 23 . Soil microbial analysis of this study revealed that more the value of log CFU of bacteria, greater was the concentration of mahanine in MK leaves.…”

Section: Discussionmentioning

confidence: 99%

“…After incubation the microbial colonies were counted using colony counter. The plates containing 30-300 microbial population were taken for the CFU (Colony Forming Unit) calculation 23 .…”

Section: Soil Microbial Analysismentioning

confidence: 99%

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Variation in biosynthesis of an effective anticancer secondary metabolite, mahanine in Murraya koenigii, conditional on soil physicochemistry and weather suitability

Kandimalla

Das

Barge

et al. 2020

Sci Rep

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Murraya koenigii (MK) leaf being a rich source of bioactive secondary metabolites has received inordinate attention in drug development research. Formation of secondary plant metabolite(s) in medicinal plants depends on several factors and in this study the cause of variation in bioavailability and content of a vital bioactive phytochemical, mahanine in the MK leaves from different geographical locations of varying soil properties and weather parameters was determined. Accordingly, MK leaves and soil samples around the plant base in quintuplicate from each site across five states of India at similar time point were collected. Mahanine content was determined and compared among samples from different regions. The quantitative analysis data comprised that MK-leaves of southern part of India contains highest amount of mahanine, which is 16.9 times higher than that of MK-leaves of north-eastern part of India (which measured as the lowest). The results suggested that pH, conductivity and bacterial populations of the soil samples were positively correlated with mahanine content in the MK-leaves. For examples, the average soil pH of the southern India sites was in basic range (8.8 ± 0.6); whereas that of the north-east India sites was in slightly acidic ranges (6.1 ± 0.5) and mean soil conductivity value for the north east India soils was 78.3 ± 16.3 µS/cm against mean value of 432.4 ± 204.5 µs/cm for south India soils. In conclusion, this study proclaims that higher level of bioactive phytochemical, mahanine in MK leaves depending upon geographical location, weather suitability and soil’s physiochemical and microbial parameters of its cultivation sites.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Variation in biosynthesis of an effective anticancer secondary metabolite, mahanine in Murraya koenigii, conditional on soil physicochemistry and weather suitability

Kandimalla

Das

Barge

et al. 2020

Sci Rep

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“…Donn et al, (2015) in a cross-year analysis of the soil microbiome in an intensive wheat cropping system, revealed a microbiota dominated by Proteobacteria, Actinobacteria and Bacteroidetes. Romero et al, (2014) and Chaturvedi and Singh (2016) reported that the most common genera of endophytes are Pseudomonas, Burkholderia, Stenotrophomonas, Micrococcus, Pantoea, Microbacterium, and Bacillus. The results noted a prevalence of Rhizobia strains, which was also observed by Romero et al, (2014).…”

Section: Discussionmentioning

confidence: 99%

Interactions between endophytic bacteria and their effects on poaceae growth performance in different inoculation and fertilization conditions

Chaves¹,

Guimarães²,

Vendruscolo³

et al. 2019

Aust J Crop Sci

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Plant growth-promoting bacteria (PGPB) are a broad group of microorganisms that offer a huge, unexplored potential. We assessed the genetic diversity of endophytic bacteria that were isolated from corn and wheat plants in 3 different types of soils: A1 (Red Argisol), A2 (Red Latosol) and A3 (Red Nitossol). Endophytic bacteria were isolated from seedlings using 7 solid culture media and were further analyzed by 16S gene sequencing. IAA (Indole-3-acetic acid) production and PSI (Phosphorus solubilization index) bacteria capacity were tested in a randomly scheme in triplicate. In vitro association was assayed with 6 randomly selected endophytic strains. The experiment design was arranged in a randomly scheme with 10 replications. In vivo assays were performed to evaluate plant growth promotion using a low-fertility soil in different inoculation and/or fertilization conditions. The experiment design was arranged in a factorial 3x4 scheme in triplicate. The following characteristics were evaluated in both experiments in triplicate: plant biomass, total nitrogen content (TN) and endophytic population. As results, a total of 136 isolates were collected, and from these isolates, 41 strains were sequenced and classified into 4 major phylogenetic categories. There was a 38-fold variation between the highest (Ensifer adhaerens) and the lowest (Agrobacterium larrymoorei) IAA producer, and only 14% of strains were high phosphate solubilizers. In vitro assays identified both positively (Burkholderia ambifaria) and negatively (Pantoea ananatis) associative strains. In vivo assays showed that plant genotype can limit or induce the endophytic microbiota and that plant microbiota are highly influenced by soil fertility.

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“…Endophytic bacterial diversity has been reported for several plant species (Miliute et al 2015;Santoyo et al 2016). The most common isolated bacterial genera are Bacillus, Burkholderia, Microbacterium, Micrococcus, Pantoea, Pseudomonas and Stenotrophomonas (Hallmann et al 1997;Chaturvedi et al 2016). Among the 13 endophytic bacteria that presented antibacterial activity and greater enzyme production, three isolated bacteria belonged to the B. subtilis species and two species to Pseudomonas spp.…”

Section: Discussionmentioning

confidence: 99%

Biotechnological applications of the medicinal plant Pseudobrickellia brasiliensis and its isolated endophytic bacteria

Cardoso

Campos

Santos

et al. 2020

J. Appl. Microbiol.

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Aim This study aimed to isolate Pseudobrickellia brasiliensis endophytic bacteria and evaluate the production of hydrolytic enzymes and antibiotics by these bacterial strains. The study also measured the antibacterial activity of P. brasiliensis. Methods and Results Thirteen endophytic bacteria strains were isolated from stem and leaf fragments of P. brasiliensis. Extracellular enzyme production by the isolated endophytic bacteria was evaluated in an agar plate‐based assay. The highest protease production was achieved by Bacillus subtilis P4 in alkaline medium. Antimicrobial activity of endophytic bacteria and P. brasiliensis extracts was investigated using microbroth dilution. An MIC value of 1000 μg ml−1 against Pseudomonas aeruginosa was found for B. subtilis P3, B. subtilis P5, Pseudomonas sp. P8 and Pseudomonas sp. P12. Leaf extract of P. brasiliensis showed the highest antibacterial activity against P. aeruginosa, with an MIC value of 0·781 mg ml−1. Conclusions Pseudobrickellia brasiliensis is a source of bacterial endophytes, which can produce antibacterial compounds and enzymes. This work also demonstrated the antibacterial potential of P. brasiliensis. Significance and Impact of the Study This is the first study that revealed the antibacterial activity of P. brasiliensis and bioactive metabolite production by P. brasiliensis endophytic bacteria.

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Potential of Bacterial Endophytes as Plant Growth Promoting Factors

Cited by 62 publications

References 50 publications

Variation in biosynthesis of an effective anticancer secondary metabolite, mahanine in Murraya koenigii, conditional on soil physicochemistry and weather suitability

Variation in biosynthesis of an effective anticancer secondary metabolite, mahanine in Murraya koenigii, conditional on soil physicochemistry and weather suitability

Interactions between endophytic bacteria and their effects on poaceae growth performance in different inoculation and fertilization conditions

Biotechnological applications of the medicinal plant Pseudobrickellia brasiliensis and its isolated endophytic bacteria

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