Azospirillum affects Eh and potential denitrification in a soil

Pidello, A.; Menendez, L.; Lensi, R.

doi:10.1007/bf02390224

Cited by 8 publications

(4 citation statements)

References 12 publications

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“…Denitrification is another major process in the nitrogen cycle which is largely controlled by redox conditions. Pidello et al (1993) showed that rhizosphere bacteria such as Azospirillum brasilense increased the soil redox potential, compared with the control (not inoculated) soil and consequently decreased by several-fold the denitrifying activity of the soil. Pidello (2003) showed for another rhizosphere bacterium, Pseudomonas fluorescens, that strains varying in pyoverdine production affected the soil redox potential differently.…”

Section: Underlying Processesmentioning

confidence: 98%

Rhizosphere: biophysics, biogeochemistry and ecological relevance

Bengough²,

et al. 2009

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Life on Earth is sustained by a small volume of soil surrounding roots, called the rhizosphere. The soil is where most of the biodiversity on Earth exists, and the rhizosphere probably represents the most dynamic habitat on Earth; and certainly is the most important zone in terms of defining the quality and quantity of the Human terrestrial food resource. Despite its central importance to all life, we know very little about rhizosphere functioning, and have an extraordinary ignorance about how best we can manipulate it to our advantage. A major issue in research on rhizosphere processes is the intimate connection between the biology, physics and chemistry of the system which exhibits astonishing spatial and temporal heterogeneities. This review considers the unique biophysical and biogeochemical properties of the rhizosphere and draws some connections between them. Particular emphasis is put on how underlying processes affect rhizosphere ecology, to generate highly heterogeneous microenvironments. Rhizosphere ecology is driven by a combination of the physical architecture of the soil matrix, coupled with the spatial and temporal distribution of rhizodeposits, protons, gases, and the role of roots as sinks for water and nutrients. Consequences for plant growth and whole-system ecology are considered. The first sections address the physical architecture and soil strength of the rhizosphere, drawing their relationship with key functions such as the movement and storage of elements and water as well as the ability of roots to explore the soil and the definition of diverse habitats for soil microorganisms. The distribution of water and its accessibility in the rhizosphere is considered in detail, with a special emphasis on spatial and temporal dynamics and heterogeneities. The physical architecture and water content play a key role in determining the biogeochemical ambience of the rhizosphere, via their effect on partial pressures of O 2 and CO 2 , and thereby on redox potential and pH of the rhizosphere, respectively. We address the Plant Soil

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Section: Underlying Processesmentioning

confidence: 98%

Rhizosphere: biophysics, biogeochemistry and ecological relevance

Bengough²,

et al. 2009

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“…The similar results between the inoculation of the strains associated with the N fertilizations of 30 kg ha -1 and 160 kg ha -1 reflect the effect of growth promotion caused by the PGPB, involving a set of mechanisms besides the production of phytohormones, such as biological control of phytopathogens, BNF and solubilization of phosphates (Bashan & Levanony, 1990;Pidello et al, 1993). In addition, the inoculation of PGPB associated with low N doses has shown greater efficiency for the plant-bacteria system, in comparison to isolated inoculation, while the application of high N doses reduces such efficiency due to the plant response to the stimulation in the absorption of the nutrient, limiting the biological process (Bárbaro et al, 2008).…”

Section: Resultsmentioning

confidence: 67%

Maize response to inoculation with strains of plant growth-promoting bactéria

Dartora

Guimarães

Menezes

et al. 2016

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThe aim of this study was to evaluate the response of maize to inoculation with strains of plant growth-promoting bacteria (PGPB) in two cultivation years. The experiment was set in a randomized block design with four replicates in two cultivation years (2012/13 and 2013/14). The treatments consisted of PGPB inoculation: control (without N and without inoculation); 30 kg of N ha -1 at sowing (N1); 160 kg of N ha -1 (N1 + 130 kg of N ha -1 as top-dressing); N1 + A. brasilense, Ab-V5; N1 + A. brasilense, HM053; N1 + Azospirillum sp. L26; N1 + Azospirillum sp. L27; N1 + Enhydrobacter sp. 4331; N1 + Rhizobium sp. 8121. Basal stem diameter, plant height, leaf area, shoot dry matter and yield were evaluated. The strain of Rhizobium sp. 8121and the isolate Azospirillum sp. L26 associated with 30 kg of N ha -1 at sowing promoted yields equivalent to that of the N fertilization of 160 kg ha -1 , demonstrating the potential to be used in the inoculation of maize seeds.Resposta do milho à inoculação de estirpes de bactérias promotoras do crescimento de plantas R E S U M O Neste trabalho objetivou-se avaliar a resposta do milho à inoculação de estirpes de bactérias promotoras do crescimento de plantas (BPCP's) em dois anos de cultivo. O experimento foi conduzido em delineamento experimental de blocos ao acaso com quatro repetições em dois anos de cultivo (2012/13 e 2013/14). Os tratamentos foram constituídos pela inoculação de BPCP's: controle (sem N e sem inoculação); 30 kg ha -1 N na semeadura (N1); 160 kg ha -1 N (N1 + 130 kg ha -1 N em cobertura); N1 + A. brasilense, Ab-V5; N1 + A. brasilense, HM053; N1 + Azospirillum sp., L26; N1 + Azospirillum sp., L27; N1 + Enhydrobacter sp. 4331; N1 + Rhizobium sp. 8121. Diâmetro basal do colmo, altura da planta, área foliar, massa seca da parte aérea e produtividade foram avaliados. A estirpe de Rhizobium sp. 8121 e o isolado de Azospirillum sp. L26 associados à adubação com 30 kg ha -1 N na semeadura proporcionaram produtividades equivalentes à adubação com 160 kg ha -1 N demonstrando potencial para serem utilizadas na inoculação de sementes de milho.

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“…In microcosms of soil inoculated with A. brasilense, the values of apparent reduction potential (Eh´) remained lower than in uninoculated control soils, even though these values were higher than 400 mV in both systems, which shows that in the studied systems aerobiosis conditions predominated (Pidello et al, 1993). The values of apparent reduction potential corrected for pH=7 (Eh´7) in inoculated systems were also lower, which proves that the reduction observed is due to differences in electroactive compounds associated with the presence of Azospirillum and not to a proton concentration effect (Glinski & Stepniewski, 1983).…”

Section: Effect On Redox and Acid-base Intensitymentioning

confidence: 79%

“…As well as having the potential to fix N 2 , they can produce siderophores, bacteriocins, and plant growth hormones (Bashan & de-Bashan, 2010;Jain et al, 2010). They can also increase ion absorption (e.g., K + and NO 3 -, avoid plant hydric stress, and modify soil redox potential (Bagheri, 2011;Bashan, 1999;Hungria et al, 2010;Pidello et al, 1993). Azospirillum also showed that it can assimilate NO 3 -in aerobiosis, reduce NO 3 -to NO 2 -in anaerobiosis, and produce polyphenol oxidase (Bashan, 1999;Hartmann & Baldani, 2006).…”

Section: Introductionmentioning

confidence: 99%

Advances in Selected Plant Physiology Aspects

Dichio¹

2012

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Born in 1971, Dr. Giuseppe Montanaro obtained his PhD in Crop Systems, Forestry and Environmental Sciences in 2006 from the University of Basilicata (IT) where he is currently employed within the Fruit Tree Section. His main research focus is on (I) fruit quality with a particular focus on Ca accumulation mechanisms in fruit (II) water relations and photosystem II efficiency. He shall continue to make contributions to this topic in the light of the expected increasing frequency and severity of drought and other consequences of a changing climate. This will also involve developing easy-to-use techniques at the orchard scale (III) Soil fertility remediation. He is actively pursuing new technologies to boost the accumulation of carbon in the soil, not just to increase carbon inputs through biomass increases and organic waste amendments.

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Azospirillum affects Eh and potential denitrification in a soil

Cited by 8 publications

References 12 publications

Rhizosphere: biophysics, biogeochemistry and ecological relevance

Rhizosphere: biophysics, biogeochemistry and ecological relevance

Maize response to inoculation with strains of plant growth-promoting bactéria

Advances in Selected Plant Physiology Aspects

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