Data/hora: 13/06/2024 07:06:37

Provedor de dados: | 58
País: | Brazil
Título: | Population densities and genetic diversity of actinomycetes associated to the rhizosphere of Theobroma cacao
Autores: | Barreto,Tâmara R.; Silva,Augusto C.M. da; Soares,Ana Cristina F.; Souza,Jorge T. de.
Data: | 2008-09-01
Ano: | 2008
Palavras-chave: | Cacao; RpoB sequence analyses; Streptomyces spp.
Resumo: | In spite of the acknowledged importance of growth-promoting bacteria, only a reduced number of studies were conducted with these microorganisms on Theobroma cacao. The objectives of this work were to study the population densities and genetic diversity of actinomycetes associated with the rhizosphere of cacao as a first step in their application in plant growth promotion and biological control. The populations densities of actinomycetes in soil and cacao roots were similar, with mean values of 1,0 x 10(6) CFU/g and 9,6 x 10(5) CFU/g, respectively. All isolates selected and used in this study were identified through sequencing analyses of a fragment of the rpoB gene that encodes the β-subunit of the RNA polymerase as species of the genus Streptomyces. In vitro cellulolytic, xilanolytic and chitinolytic activity, indolacetic acid production and phosphate solubilization activities were observed in most of the isolates tested. The data obtained in this study demonstrate that actinomycetes account for a higher percentage of the total population of culturable bacteria in soil than on cacao roots. Additionally, actinomycetes from the cacao rhizosphere are genetically diverse and have potential applications as agents of growth promotion.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822008000300010
Editor: | Sociedade Brasileira de Microbiologia
Relação: | 10.1590/S1517-83822008000300010
Formato: | text/html
Fonte: | Brazilian Journal of Microbiology  v.39 n.3 2008
Fonte: | info:eu-repo/semantics/openAccess