Population densities and genetic diversity of actinomycetes associated to the rhizosphere of Theobroma cacao

Barreto, Tâmara R.; Silva, Augusto C.M. da; Soares, Ana Cristina Fermino; Souza, Jorge Teodoro de

doi:10.1590/s1517-83822008000300010

Cited by 31 publications

(11 citation statements)

References 24 publications

(30 reference statements)

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“…Variation observed in total population density of bacterial Variation observed in total population density of bacterial community with sugarcane was also obtained in other studies on bacteria associated with other host plants ( Kuklinsky-Sobral et al, 2004;Barreto et al, 2008). Preferential colonization of endophytic and epiphytic bacteria in the root zone, regardless of type of sugarcane variety, reflected the presence of greater amount of nutrients located in the rhizosphere and rhizoplane, compared with the leaves (Table 1), because these nutrients are responsible for higher bacterial growth and development (Cocking, 2003;Medeiros et al, 2006).…”

Section: Discussionsupporting

confidence: 78%

Bacteria associated with sugarcane in Northeastern Brazil

Silva¹,

Freire²,

Kuklinsky-Sobral³

et al. 2016

Afr. J. Microbiol. Res.

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Sugarcane has a high demand in nitrogen, increasing costs and causing damages to the environment. It is necessary to find alternatives to reduce nitrogen fertilizers use. Diazotrophic bacteria have capacity to promote growth in grass with potential to fix N 2 and solubilize inorganic phosphate. This study aimed to evaluate bacterial community associated with different sugarcane varieties in Northeastern Brazil, select bacteria with plant growth-promoting characteristics, and identify endophytic and epiphytic bacterial lineages in sugarcane. Endophytic bacteria of leaves and roots and epiphytic bacteria of rhizoplane were isolated from three sugarcane commercial varieties and selected for their capacity to fix N 2 and solubilize inorganic phosphate. Bacterial strains from different morphological groups were isolated and a sample of 27 strains with potential for the simultaneous development of these characteristics were selected and identified. The bacterial community that interacted with sugarcane was more associated with rhizoplane and roots regions than with leaves, and had a high potential to fix N 2 and solubilize inorganic phosphate. Bacterial lineages were mainly from genera Pantoea sp. and Burkholderia sp., but there were also genera Enterobacter sp., Klebsiella sp. and Pseudomonas sp. and two lineages at the species level: Pantoea stewartii and Burkholderia cenocepacia.

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Section: Discussionsupporting

confidence: 78%

Bacteria associated with sugarcane in Northeastern Brazil

Silva¹,

Freire²,

Kuklinsky-Sobral³

et al. 2016

Afr. J. Microbiol. Res.

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“…MCR9 y MCR26 según Duncan, lo cual demuestra que tienen una actividad mineralizadora de fosfato similar, mientras que la cepa fósforo, siendo un aporte signifi cativo de este trabajo. Según Barreto et al (2008) los actinomicetos son un grupo de procariotes conocidos por intervenir en el ciclaje de nutrientes del suelo, de ahí que presenten la actividad de solubilización del fósforo inorgánico.…”

Section: Mineralización De Fosfatos Mediante La Detección De Fosfomonunclassified

Actinomicetos mineralizadores de fosfato involucrados en la interacción radical de Glomus sp. - trébol blanco.

et al. 2011

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RESUMENActinomicetos mineralizadores de fosfato involucrados en la interacción radical de Glomus sp. -trébol blanco. El objetivo de este trabajo fue determinar la capacidad de los actinomicetos para mineralizar fósforo orgánico y su interacción rizosférica con micorrizas en Trifolium repens L. (trébol blanco). En enero de 2009, en el laboratorio de la Unidad de Investigaciones Agropecuarias (UNIDIA) de la Pontifi cia Universidad Javeriana, Bogotá, Colombia, se cuantifi có la actividad fosfatasa de Streptomyces sp. (cepa MCR9), Streptomyces sp. (cepa MCR26) y Thermobifi da sp. (cepa MCR24) con la técnica del p-nitrofenil fosfato. Thermobifi da sp. (cepa MCR24) presentó la menor actividad. La inoculación de solo actinomicetos presentó valores mayores de fósforo inorgánico en suelo, mientras que la concentración de fósforo a nivel foliar fue mayor cuando había co-inoculación actinomiceto-Glomus sp., a excepción de la cepa Thermobifi da sp. (cepa MCR24). La co-inoculación con los actinomicetos y Glomus sp. estimuló la producción de biomasa y el porcentaje de colonización. Se determinó la capacidad para mineralizar fósforo orgánico por los actinomicetos al asociarse con Glomus sp. de forma sinérgica y benéfi ca tanto para la planta como para la micorriza. Se realizó el análisis de la varianza y prueba de "t" ALS (P<0,05) para comparar los promedios entre los tratamientos. Se determinó el grado de relación entre el porcentaje de micorrización y el peso seco de las plantas mediante "r" Coefi ciente de Correlación, donde las plantas con los microorganismos presentaron una micorrización mayor del 70%. ABSTRACTPhosphate-mineralizing Actinomycetes involved in root interaction of Glomus sp.-white clover. The objective of this work was to determine the capacity of actinomicetes for organic phosphorus mineralization and their rhyzospere interaction with mycorrhiza of Trifolium repens L. (white clover). In January 2009, at the laboratory of the Unidad de Investigaciones Agropecuarias (UNIDIA) of the Pontifi cia Universidad Javeriana, Bogotá, Colombia, the phosphatase activity of Streptomyces sp. (strain MCR9), Streptomyces sp. (strain MCR26) and Thermobifi da sp. (strain MCR24) were determined using the p-nitrofenil phosphate technique. Thermobifi da sp. (strain MCR24) showed the lowest activity. Inoculation of actinomycetes alone resulted in higher values of inorganic soil P, while leaf P content was higher when coinoculation of actinomycete-Glomus sp. occurred, with the exception of the strain Thermobifi da sp. (strain MCR24). Coinoculation with actynomicetes and Glomus sp. stimulated biomass production and colonization percent. Actynomicetes are sinergistic with Glomus sp., resulting in benefi ts for the plant and the mycorrhiza. Analysis of variance and "t" tests ALS (P<0,05) were conducted to compare the treatments. The relation between the degree of mycorrhization plant dry weight was determined by the "r" correlation coeffi cient, and plants associated with microorganisms was higher than 70%.

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“…Nearly 20 % of the actinomycetes including Streptomyces and Micromonospora possess profound phosphate-solubilizing potential (Barreto et al 2008;El-Tarabily et al 2008;Hamdali et al 2008b). Actinomycetes as P solubilizer have received greater attention for two reasons: (1) ability to produce agro-active metabolites, for example, phytohormones, siderophores, and antibiotics, etc.…”

Section: Role Of Actinobacteria In Rock Phosphate Solubilizationmentioning

confidence: 99%

Role of Phosphate-Solubilizing Actinomycetes in Plant Growth Promotion: Current Perspective

Saif

Khan

Zaidi

et al. 2014

Phosphate Solubilizing Microorganisms

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Phosphorus (P), an essential plant nutrient, is a nonrenewable resource whose availability depends exclusively on mined rock phosphates. Deficiency of P in soil results in reduction in food production since all plants require an adequate supply of P for its growth and development. Even though synthetic phosphatic fertilizer has played some major roles in enhancing crop production, its excessive use has also dark sides to it where it has been found to damage the environment, destruct soil fertility, and, via food chain, seriously affect the human health. Considering the nuisance of overuse of P, there is an urgent demand by the agriculture practitioners to find nonhazardous strategy that can overcome/reduce the use of agrochemicals in agricultural practices and, hence, may preserve the very integrity of soil ecosystems. In this context, actinobacteria, a group of Grampositive bacteria, ubiquitous in soils, are likely to play some important roles in supplying soluble P to plants by solubilizing/mineralizing complex P resources of soils. Additionally, the extracellular metabolites produced by actinomycetes may inhibit phytopathogens and, sometimes such metabolic compounds may also act as plant growth regulators. These qualities, among others, make actinobacteria an ideal candidate for developing as microbial inoculants for ultimate use in agriculture production system. The potential roles of actinomycetes as phosphate solubilizers in enhancing crop production are discussed.

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Population densities and genetic diversity of actinomycetes associated to the rhizosphere of Theobroma cacao

Cited by 31 publications

References 24 publications

Bacteria associated with sugarcane in Northeastern Brazil

Bacteria associated with sugarcane in Northeastern Brazil

Actinomicetos mineralizadores de fosfato involucrados en la interacción radical de Glomus sp. - trébol blanco.

Role of Phosphate-Solubilizing Actinomycetes in Plant Growth Promotion: Current Perspective

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