Root exudate effects on the bacterial communities, CO2 evolution, nitrogen transformations and ATP content of rhizosphere and bulk soils

Landi, L.; Valori, F.; Ascher, Judith; Renella, Giancarlo; Falchini, L.; Nannipieri, Paolo

doi:10.1016/j.soilbio.2005.05.021

Cited by 156 publications

(80 citation statements)

References 27 publications

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“…Future studies should simulate the rhizosphere effect by adding specific flavonoids occurring in root exudates, for example, by using the approach by Landi et al (2006), who showed that both oxalic and glucose changed the DGGE profiles of soil bacterial communities in the 0-2-mm soil layer of the model root system. However, extrapolation of these results to in situ conditions is not straightforward, as these laboratory studies represent model systems under optimal conditions that rarely occur in real soils.…”

Section: Impact On Soil Bacteriamentioning

confidence: 99%

Plant-borne flavonoids released into the rhizosphere: impact on soil bio-activities related to plant nutrition. A review

et al. 2012

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Plants produce and release in the surrounding soil, the so-called rhizosphere, a vast variety of secondary metabolites. Among them, flavonoids are the most studied, mainly for their role in the establishment of rhizobiumlegume symbiosis; on the other hand, some studies highlight that they are also important in the plant strategies to acquire nutrients from the soil, for example, by acting on its chemistry. The scope of this review is to give a quick overview on the types and amounts of plant-released flavonoids in order to focus on their effects on soil activities that in turn can influence nutrient availability and so plant mineral nutrition; emphasis is given to the different nutrient cycles, soil enzyme, and soil bacteria activities, and their influence on soil macrofauna and roots of other plants. Finally, the possible outcome of the climate change on these processes is discussed.

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Section: Impact On Soil Bacteriamentioning

confidence: 99%

Plant-borne flavonoids released into the rhizosphere: impact on soil bio-activities related to plant nutrition. A review

et al. 2012

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“…Despite these limitations, studies based on substrate utilization patterns have suggested that carbohydrates and organic acids might be the most discriminating compounds between communities sampled from the rhizosphere of different plants (Grayston et al, 1998) or between communities sampled at different root distances or root stages (Baudoin et al, 2001). In addition to these metabolic profiling methods, a few other studies assessed the effect of complex mixtures of root exudates (Kozdroj and van Elsas, 2000;Rangel-Castro et al, 2005) and of specific compounds, like glucose or oxalic acid (Landi et al, 2006) on the structure of bacterial communities. In this latter study, the addition of both glucose and oxalic acid to the soil caused shifts in the structure of bacterial communities, and the changes were higher in oxalic acid-treated soils than in glucose-treated soils.…”

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Spatio-temporal dynamics of bacterial communities associated with two plant species differing in organic acid secretion: A one-year microcosm study on lupin and wheat

Weisskopf

Bayon

Köhler

et al. 2008

Soil Biology and Biochemistry

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a b s t r a c tPlants are generally assumed to influence the surrounding soil microflora through rhizodeposition. However, the role of rhizodeposits, and especially organic acids, in structuring the bacterial communities is still poorly understood. In this study, we asked the question whether plants differing in organic acid secretion have a different impact on the soil bacterial communities, and if this is the case, to which extent this impact is due to different organic acid concentrations in the rhizosphere. To investigate this question, we compared white lupin and wheat. The former is a high organic acid-secreting species, while the latter secretes only low amounts of carboxylates. We grew the plants in large microcosms including root-free control compartments for one year (replanted every second month) and analyzed the spatio-temporal changes in soil ATP concentrations, as well as in diversity and structure of bacterial communities (using DNA-and RNA-based DGGE) along a root-soil gradient after two, six and twelve month's cultivation. Our results showed: i) that white lupin and wheat differed in their impact on soil ATP concentrations and on the structure of root bacterial communities; ii) that cultivation time was a key factor in explaining the observed differences in all the parameters studied; and iii) that the amounts of organic acids accounted for a significant proportion (15%) of the variability within root active communities. These results indicate that plants influence their associated bacterial communities in a species-specific way and that for communities living in the direct vicinity of roots (rhizoplane-endorhizosphere), a significant part of this influence can be attributed to root-secreted organic acids.

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“…No entanto, esses valores foram menores que os observados em solos contaminados com óleo diesel na Finlândia (Palmroth et al, 2005) A qualidade e a quantidade de exsudados radiculares, bem como a morfologia radicular, variam entre as espécies vegetais, e isso tem grande influência sobre as propriedades microbiológicas da rizosfera (Binet et al, 2000b;Landi et al, 2006), as quais podem afetar a taxa de degradação dos compostos contaminantes no solo. Portanto, a ocorrência de plantas em solos de áreas contaminadas pode contribuir para a eficiência da descontaminação (Merkl et al, 2004).…”

Section: Seqüenciamento Do Gene Rrna 16s De Bactérias Degradadoras Deunclassified

Comunidades microbianas, atividade enzimática e fungos micorrízicos em solo rizosférico de "Landfarming" de resíduos petroquímicos

Nakatani

Siqueira

Soares³

et al. 2008

Rev. Bras. Ciênc. Solo

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RESUMOAs raízes das plantas podem estimular a microbiota do solo, a qual pode contribuir para o aumento da eficiência do processo de remediação. Assim, avaliar a magnitude dos efeitos das raízes sobre a microbiota do solo é de grande interesse e de relevância prática e ecológica. Neste trabalho, avaliaram-se a densidade microbiana, a atividade enzimática, a estrutura da comunidade bacteriana e a presença de fungos micorrízicos arbusculares (FMAs) na rizosfera de plantas de ocorrência espontânea em solo de sistema de "landfarming" de resíduos petroquímicos. Avaliaram-se também solos rizosféricos de cinco plantas e solocontrole sem planta por meio de contagens de microrganismos em placas, eletroforese em gel com gradiente desnaturante (DGGE) de fragmentos do gene rRNA 16S, seqüenciamento genético, atividades enzimáticas, percentagem de colonização radicular e contagem e identificação de esporos de FMAs. As plantas estimularam a densidade microbiana total e da população de degradadores de antraceno, com contagens médias de 1,5 x 10 6 e 2,2 x 10 6 UFC g -1 no solo seco, respectivamente, enquanto, no solo sem planta, essas contagens foram de 5,7 x 10 5 e 2,9 x 10 5 UFC g -1 no solo seco para os respectivos grupos microbianos. As espécies de maior efeito foram Bidens pilosa e Eclipta alba. Entretanto, esses efeitos estimulantes não foram verificados para a atividade enzimática do solo. A colonização micorrízica das raízes (em torno de 40 %) e a densidade de esporos nos solos rizosféricos foram elevadas (entre 900 e 4.800 esporos por 50 cm 3 de solo), sendo maior na Brachiaria decumbens. Foram identificadas quatro espécies de FMAs: Acaulospora morrowiae, Glomus intraradices, Paraglomus occultum e Archaeospora trappei. Com exceção de G. intraradices, essas espécies não foram

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Root exudate effects on the bacterial communities, CO2 evolution, nitrogen transformations and ATP content of rhizosphere and bulk soils

Cited by 156 publications

References 27 publications

Plant-borne flavonoids released into the rhizosphere: impact on soil bio-activities related to plant nutrition. A review

Plant-borne flavonoids released into the rhizosphere: impact on soil bio-activities related to plant nutrition. A review

Spatio-temporal dynamics of bacterial communities associated with two plant species differing in organic acid secretion: A one-year microcosm study on lupin and wheat

Comunidades microbianas, atividade enzimática e fungos micorrízicos em solo rizosférico de "Landfarming" de resíduos petroquímicos

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