Characterization of streptomycetes with potential to promote plant growth and biocontrol

By C. S. M. Sousa, A. Soares, M. S. Garrido. 2008

95 citations recorded by the source corpus.

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.

Subfields: Plant Science

View Paper: https://www.semanticscholar.org/paper/4d9aa5ce2713350ccfb472f181c28fd838932860

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Citations in the corpus

Rhizospheric streptomycetes as potential biocontrol agents of Fusarium and Armillaria pine rot and as PGPR for Pinus taeda (2009, background): “Recently, it has been demonstrated that these microorganisms can promote plant growth (Sousa et al. 2008) and increase mycorrhizal root colonization, which is the main reason for their denomination as MHB (mycorrhiza helper bacteria) (Maier et al. 2004; Schrey et al. 2005).”
Solubilisation of inorganic phosphates by inoculant strains from tropical legumes (2011, background): “The majority of studies looking at phosphate-solubilising microrganisms involve studies with fungi and free-living bacteria in the soil (Sousa et al., 2008; Bojinova et al., 2008; Linu et al., 2009; Ali et al., 2010).”
Plant growth-promoting rhizobacteria (PGPR): emergence in agriculture (2011, background): “Numbers of reports (Gomes et al. 2000; Sousa et al. 2008) are available on the potential of actinomycetes as plant growth-promoting agent.”
Plant growth promoting rhizobacteria and their potential for biocontrol of phytopathogens (2016, background): “Numbers of reports (Gomes et al., 2000; Sousa et al., 2008; Köberl et al., 2013; Köberl, 2013) are available on the potential of actinomycetes as plant growth-promoting agent.”