Plant growth-promoting rhizobacteria

Podile, Appa Rao; Kishore, G. Krishna

doi:10.1007/1-4020-4538-7_6

Cited by 86 publications

(90 citation statements)

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“…Phosphorus solubilization is one of the important mechanisms through which PSRB isolates promote plant growth, but this is not only the way of plant growth promotion. There are several other mechanisms like direct stimulation, production of gibberellins, cytokinin, ACC deaminase, volatile compounds that are reported previously (Podile and Kishor 2006) which was not characterized in the present study. It was assumed that one or many of these traits may be involved in the plant growth promoting activity by isolate PSRB19.…”

Section: *Solubilization Index = Total Diameter (Colony + Halo Zone)/contrasting

confidence: 67%

Isolation and characterization of phosphate solubilizing rhizobacteria to improve plant health of tomato

2008

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In the present study, 43 isolates of Phosphate solubilizing rhizobacteria (PSRB) were isolated from 37 rhizospheric soil samples of tomato collected from tomato growing regions of Karnataka. Among the 43 isolates, 33 were found to be positive for solubilizing both inorganic and organic forms of phosphorous. The isolates were analyzed for their ability to colonize roots of tomato and to increase the seed quality parameters under laboratory conditions. On the basis of above criteria, 16 isolates were selected for further studies. Organic acids from PSRB isolates were analyzed and phytase zymogram for two isolates viz., PSRB21 and 31 was prepared. Under greenhouse conditions, all selected isolates showed increased shoot length, root length, fresh weight, dry weight and phosphorous content of tomato seedlings to various extent with respect to control. Analysis of pH and available phosphorous in rhizosphere soil samples of 30 dayold-seedlings revealed that the available phosphorous content was high in rhizospheric soil samples of plants raised from seeds bacterized with PSRB isolates over control. Even though all selected PSRB's were able to increase the plant growth, only few of them showed protection against fusarium wilt and none of them against early blight.

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Section: *Solubilization Index = Total Diameter (Colony + Halo Zone)/contrasting

confidence: 67%

Isolation and characterization of phosphate solubilizing rhizobacteria to improve plant health of tomato

2008

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“…Even in phosphorus rich soils, most of this element is in insoluble form and only a small proportion (~0.1%) is available to plants (Stevenson and Cole 1999). Additionally, a large percentage of the phosphate fertilizers applied to soils reprecipitate into insoluble forms thus increasing the P requirement of the crop (Podile and Kishore 2006).…”

Section: Introductionmentioning

confidence: 99%

Phosphate-solubilizing peanut associated bacteria: screening for plant growth-promoting activities

et al. 2009

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In the present study, attempts were made to identify the potential of bacterial strains for promoting Arachis hypogaea L. growth. Four hundred and thirty three bacteria were isolated from rhizosphere, phyllosphere and plant tissues from peanuts cultivated in the producing area of Cordoba, Argentina. From this collection, 37 epiphytic isolates and 73 endophytic isolates were selected on the basis of tricalcium phosphate solubilizing activity. These isolates were further tested for other plant growth-promoting attributes and some of them evaluated to examine the effect of inoculation on peanut growth. Siderophore production was observed in a high percentage of the isolates, especially in the root nodule endophytes. Antibiosis was evaluated against the phytopathogen fungus Sclerotinia minor and S. Sclerotiorum. Endophytes from nodules showed the highest levels of fungal growth inhibition. A low number of isolates was able to produce auxin like molecules and inoculation of peanut seedlings with these bacteria showed variability on seed germination enhancement. Isolate J49, identified to belong to genus Pantoea, was the most promising bacterium because it increases peanut plant biomass in inoculation experiments. Peanut soils in the province of Cordoba harbor bacteria with major plant growth promotion properties which represent a potential source of new strains that could be used as biological inoculants in agriculture.

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“…The root colonising microorganisms could be free living, parasitic or saprophytic. An important group of these microbial communities that exerts beneficial effects on plant growth upon root colonisation were first defined by Kloepper and Schroth (1978) and termed them as plant growth promoting rhizobacteria (PGPR) (Podile and Kishore, 2006).…”

Section: Introductionmentioning

confidence: 99%

Characterisation of a psychrotolerant plant growth promotingPseudomonas sp. strain PGERs17 (MTCC 9000) isolated from North Western Indian Himalayas

Mishra

Selvakumar

et al. 2008

Ann. Microbiol.

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A psychrotolerant, Gram negative, rod shaped, plant growth promoting bacterium (PGPB) was isolated from high altitude of North Western Indian Himalayas. The identity of the bacterium was confirmed by morphological, biochemical and sequencing of the 16S rRNA gene. The sequence analysis revealed maximum similarity with Pseudomonas vancouverensis. It exhibited tolerance to a wide pH range (5-12; optimum 7.0) and salt concentrations up to 5% (w/v). The isolate produced 8.33 and 1.38 g/ml of IAA at 15 °C and 4 °C respectively, on the third day after incubation. It solubilised 42.3, 66.3 and 74.1 g/ml of tricalcium phosphate at 4, 15 and 28 °C respectively after seven days of incubation. The strain also possessed HCN and siderophore production abilities at 4 °C. It exhibited inhibitory activity against several phytopathogenic fungi in three different bioassays. The maximum relative growth inhibition was recorded against Sclerotium rolfsii and Rhizoctonia solani (100%), followed by Pythium sp. (73.1%) and Fusarium oxysporum (19.7%), in volatile compound assays. Seed bacterization with the isolate enhanced the germination of wheat seedlings grown at 18 ± 1 °C by 20.3%. Bacterized seeds also recorded 30.2 and 27.5% higher root and shoot length respectively, compared to uninoculated controls.

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Plant growth-promoting rhizobacteria

Cited by 86 publications

References 0 publications

Isolation and characterization of phosphate solubilizing rhizobacteria to improve plant health of tomato

Isolation and characterization of phosphate solubilizing rhizobacteria to improve plant health of tomato

Phosphate-solubilizing peanut associated bacteria: screening for plant growth-promoting activities

Characterisation of a psychrotolerant plant growth promotingPseudomonas sp. strain PGERs17 (MTCC 9000) isolated from North Western Indian Himalayas

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