characterization of streptomycetes with potential to promote plant growth and biocontrol caracterização de estreptomicetos com potencial para promoção de crescimento de plantas e biocontrole

Clicks: 304
ID: 171994
2008
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Abstract
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.
Estudos com estreptomicetos em programas de biocontrole e promoção de crescimento de plantas são alternativas tecnológicas de produção sustentáveis ao ambiente. O presente trabalho teve como objetivo caracterizar seis isolados de estreptomicetos quanto à produção de enzimas extracelulares, ácido indolacético e sideróforos, capacidade de solubilização de fosfatos, colonização radicular e de crescimento em diferentes níveis de pH e salinidade. Para detectar a produção das enzimas extracelulares, os isolados foram cultivados em meio de cultura contendo os substratos dessas enzimas, como única fonte de carbono. Para determinar a capacidade de colonizar o sistema radicular, sementes de tomate foram cultivadas em meio ágar-água 0,6% e inoculadas com os estreptomicetos. O crescimento em diferentes níveis de salinidade e pH foram avaliados em meio de cultura AGS, com os níveis de NaCl 1%, 1,5%, 2%, 2,5% e 3% e níveis de pH ajustados em 5,0, 5,5, 6,0, 6,5 e 7,0. Todos os isolados produziram as enzimas amilase, catalase e lípase, assim como o ácido indolacético. Todos os isolados apresentaram atividade celulolítica e quitinolítica, com exceção do AC-92. Somente o AC-26 não demonstrou atividade xilanolítica. Os isolados AC-147, AC-95 e AC-29 foram os maiores produtores de sideróforos. Os isolados AC-26 e AC-29 não demonstraram a capacidade in vitro de solubilizar fosfatos. Todos os isolados colonizaram as raízes das plântulas de tomateiro e AC-92 apresentou crescimento em todos os índices de salinidade e pH avaliados. Os estreptomicetos testados neste estudo foram considerados potenciais agentes de biocontrole de doenças e promoção do crescimento de plantas.
Reference Key
sousa2008scientiacharacterization Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Carla da Silva Sousa;Ana Cristina Fermino Soares;Marlon da Silva Garrido
Journal journal of the iranian chemical society
Year 2008
DOI
10.1590/S0103-90162008000100007
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000100007
Keywords
extracellular enzymes actinomycetes

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