Indole-3-acetic acid production by Streptomyces sp. isolated from some Thai medicinal plant rhizosphere soils

Khamna, Sutthinan; Yokota, Akira; Peberdy, John F.; Lumyong, Saisamorn

doi:10.5053/ejobios.2010.4.0.4

Cited by 203 publications

(164 citation statements)

References 29 publications

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“…However, a noticeable decrease in IAA production was observed at higher concentrations of L-tryptophan (3, 4 and 5 mg mL À1 ). These results concur with the earlier observations Khamna et al (2010) indicating that L-tryptophan at higher concentration exerts negative effects on IAA production. On the other side, some recent studies found strong linear correlation between the bacterial IAA production and L-tryptophan concentrations in the growth media (Legault et al, 2011;Patil, 2011).…”

Section: Plant Growth Promoting Traits Of P Myrsinacearum Rc6bsupporting

confidence: 83%

Phytoextraction of heavy metal polluted soils using Sedum plumbizincicola inoculated with metal mobilizing Phyllobacterium myrsinacearum RC6b

et al. 2013

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h i g h l i g h t sIsolated Phyllobacterium myrsinacearum RC6b effectively mobilized metals in soils. RC6b inoculation enhanced growth and Cd and Zn uptake of Sedum plumbizincicola. Possible mechanisms are plant beneficial activities and soil metal mobilization. RC6b is a good candidate for microbially assisted phytoremediation. a r t i c l e i n f o t r a c tThe aim of this study was to investigate the effects of metal mobilizing plant-growth beneficial bacterium Phyllobacterium myrsinacearum RC6b on plant growth and Cd, Zn and Pb uptake by Sedum plumbizincicola under laboratory conditions. Among a collection of metal-resistant bacteria, P. myrsinacearum RC6b was specifically chosen as a most favorable metal mobilizer based on its capability of mobilizing high concentrations of Cd, Zn and Pb in soils. P. myrsinacearum RC6b exhibited a high degree of resistance to Cd (350 mg L À1 ), Zn (1000 mg L À1 ) and Pb (1200 mg L À1 ). Furthermore, P. myrsinacearum RC6b showed multiple plant growth beneficial features including the production of 1-aminocyclopropane-1-carboxylic acid deaminase, indole-3-acetic acid, siderophore and solubilization of insoluble phosphate. Inoculation of P. myrsinacearum RC6b significantly increased S. plumbizincicola growth and organ metal concentrations except Pb, which concentration was lower in root and stem of inoculated plants. The results suggest that the metal mobilizing P. myrsinacearum RC6b could be used as an effective inoculant for the improvement of phytoremediation in multi-metal polluted soils.

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Section: Plant Growth Promoting Traits Of P Myrsinacearum Rc6bsupporting

confidence: 83%

Phytoextraction of heavy metal polluted soils using Sedum plumbizincicola inoculated with metal mobilizing Phyllobacterium myrsinacearum RC6b

et al. 2013

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“…Similar studies carried out by other researchers' also show that Streptomyces spp. are predominant in the rhizosphere [36,37]. Previous research works have shown the number and diversity of the genus Streptomyces in the rhizospheric soils is in relation to the type and amount of exudates, and plant species [38].…”

Section: Discussionmentioning

confidence: 99%

Phylogenetic Characterization of Culturable Antibiotic Producing Streptomyces from Rhizospheric Soils

Babalola¹

2014

Mol Biol

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Streptomyces spp. were isolated from rhizospheric soils collected from Ngaka Modiri Molema District, North West Province, South Africa. Ten of these bacterial isolates were found to exhibit broad spectrum antimicrobial activity against test organisms with varying degree of activity. The cultural characteristics of the bacterial isolates were consistent with that of the members of the genus Streptomyces. Molecular identification of the potent bacterial isolates was carried out by amplifying the 16S rDNA gene; this gave the expected size of 1.5 kb and was sequenced. Further computational analysis including BLAST search and phylogenetic analysis were performed to correlate the bacterial isolates with other species of the genera in the database library. The computational analysis of the amplified 16S rDNA gene confirmed that the bacterial isolates are members of the genus Streptomyces with 89-100% sequence similarity. The phylogenetic analysis showed that the 10 bacterial isolates were divided into 3 major clusters with varying bootstrap values. The strain NWU195 formed a distinct phyletic line in the Streptomyces 16S rDNA gene tree suggesting a new strain. The 16S rDNA sequences of the bacterial isolates was submitted to the GenBank under the accession numbers JX284398-JX284407. The 16S rDNA gene sequence analysis is a significant tool for phylogenetic analysis of Streptomyces spp.

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“…Hence, isolation of new Streptomyces from natural resources and characterization of their secondary metabolites is valuable [10][11][12][13][14] . In the present study, we have isolated 32 actinomycetes from rhizosphere soils of Shikaripura by serial dilution followed by plating on SCN agar.…”

Section: Discussionmentioning

confidence: 99%

Antibacterial Activity of Three Streptomyces Species Isolated From Soils of Shikaripura, Karnataka, India

Dileep¹,

Junaid²,

Rakesh³

et al. 2013

J Biol Sci Opin

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The present study was conducted to determine antibacterial efficacy of actinomycetes isolated from rhizosphere soils of Shikaripura, Karnataka, India. A total of 32 actinomycetes were recovered on Starch casein nitrate agar. Primary screening by cross streak method revealed marked antibacterial activity in case of three isolates viz., SRDP-S-03, SRDP-S-05 and SRDP-S-30. These isolates were grown in Starch casein nitrate broth and the culture filtrates were extracted using ethyl acetate. Secondary screening for antibacterial activity of ethyl acetate extract was performed by agar well diffusion assay. The extracts have shown marked inhibition of Gram positive bacteria when compared to Gram negative bacteria.Microscopic characteristics and other characteristics assisted identification of three actinomycete isolates as members of Streptomyces. Further studies on characterization of isolates and purification of bioactive compounds from ethyl acetate extracts are under progress.

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Indole-3-acetic acid production by Streptomyces sp. isolated from some Thai medicinal plant rhizosphere soils

Cited by 203 publications

References 29 publications

Phytoextraction of heavy metal polluted soils using Sedum plumbizincicola inoculated with metal mobilizing Phyllobacterium myrsinacearum RC6b

Phytoextraction of heavy metal polluted soils using Sedum plumbizincicola inoculated with metal mobilizing Phyllobacterium myrsinacearum RC6b

Phylogenetic Characterization of Culturable Antibiotic Producing Streptomyces from Rhizospheric Soils

Antibacterial Activity of Three Streptomyces Species Isolated From Soils of Shikaripura, Karnataka, India

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