Root-Induced Changes in the Availability of Nutrients in the Rhizosphere

Neumann, G.; Römheld, Volker; Waisel, Y.; Eshel, Amram; Kafkafi, U.

doi:10.1201/9780203909423.ch36

Cited by 103 publications

(58 citation statements)

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“…However, the results need to be interpreted with some caution since also indirect effects of the inoculant cannot be excluded: that is, Ögüt et al (2011) reported stimulation of proton extrusion by the roots of the host plant after inoculation with certain strains of Bacillus sp. Also, stimulation of root hair development induced by the inoculants (Dobbelaere et al 1999) would increase the root surface area that is available for ammonium‐induced rhizosphere acidification (Neumann and Römheld 2002) and thereby might intensify the acidification potential of the roots. Moreover improved recruitment of other plant beneficial micro‐organisms after FZB42 inoculation has been repeatedly reported in other studies (Eltlbany et al 2019; Kröber et al 2014; Thonar et al 2016; Yusran et al 2007).…”

Section: Discussionmentioning

confidence: 99%

Acquisition of rock phosphate by combined application of ammonium fertilizers and Bacillus amyloliquefaciens FZB42 in maize as affected by soil pH

Mpanga

Ludewig

Dapaah

et al. 2020

J. Appl. Microbiol.

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Aims The use of plant growth‐promoting micro‐organisms (PGPMs) to improve plant‐nutrient acquisition has a long history but reproducibility remains a challenge. Recent findings suggest an important role of suitable inoculant‐fertilizer combinations for the expression of PGPM‐effects, particularly with respect to nitrogen (N) supply. In face of the well‐documented N form effects on rhizosphere pH, this study addressed the impact of ammonium‐assisted PGPM‐interactions on the acquisition of sparingly soluble calcium‐phosphates as affected by soil pH. Methods and Results The effects of stabilized ammonium fertilization combined with the PGPM inoculant Bacillus amyloliquefaciens FZB42 on the acquisition of rock phosphate in maize were examined on two soils (moderately acidic‐pH 5·6 and alkaline‐pH 7·8). On the two contrasting soils, FZB42 improved the P status and promoted plant growth by different mechanisms. On the acidic soil, a combination of ammonium‐fertilization with FZB42 increased P‐acquisition by Rock P solubilization via rhizosphere acidification but P‐supply in the noninoculated control was already sufficient to meet the plant demands. By contrast, on the alkaline soil, plant growth‐promotion was associated with FZB42‐induced root growth stimulation. Conclusion The results suggest a significant impact of soil pH on performance and the mode of action of PGPM inoculants, to be considered for practical applications. Significance and Impact of the Study The study advanced existing knowledge on PGPM‐assisted P solubilization as affected by different soil properties. The results suggest perspectives for management options to be considered for efficient use of PGPMs in terms of selecting application strategies with compatible PGPM‐fertilizer combinations, depending on soil pH conditions.

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Section: Discussionmentioning

confidence: 99%

Acquisition of rock phosphate by combined application of ammonium fertilizers and Bacillus amyloliquefaciens FZB42 in maize as affected by soil pH

Mpanga

Ludewig

Dapaah

et al. 2020

J. Appl. Microbiol.

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“…While available nutrients are rapidly depleted, their restoration in rhizosphere soil depends on their relative mobilities through soil solution transport. Nutrients that show poor mobility, such as phosphorus, potassium, and ammonium, undergo local depletions in the rhizosphere, whereas more mobile nutrients, such as nitrate and calcium, can be restored (Neumann and Romheld, 2002). The pH of the rhizosphere can differ up to 2–3 units from bulk soil as a direct result of biological activity, which can likewise impact the relative solubilities of essential nutrients—for example, phosphorus is found most abundantly in soil in insoluble inorganic forms that can be solubilized through the actions of plants and microbes (Neumann and Romheld, 2002).…”

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confidence: 99%

Amino acids in the rhizosphere: From plants to microbes

Moe

2013

American J of Botany

297

157

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Often referred to as the "building blocks of proteins", the 20 canonical proteinogenic amino acids are ubiquitous in biological systems as the functional units in proteins. Sometimes overlooked are their varying additional roles that include serving as metabolic intermediaries, playing structural roles in bioactive natural products, acting as cosubstrates in enzymatic transformations, and as key regulators of cellular physiology. Amino acids can also serve as biological sources of both carbon and nitrogen and are found in the rhizosphere as a result of lysis or cellular efflux from plants and microbes and proteolysis of existing peptides. While both plants and microbes apparently prefer to take up nitrogen in its inorganic form, their ability to take up and use amino acids may confer a selective advantage in certain environments where organic nitrogen is abundant. Further, certain amino acids (e.g., glutamate and proline) and their betaines (e.g., glycine betaine) serve as compatible solutes necessary for osmoregulation in plants and microbes and can undergo rapid cellular flux. This ability is of particular importance in an ecological niche such as the rhizosphere, which is prone to significant variations in solute concentrations. Amino acids are also shown to alter key phenotypes related to plant root growth and microbial colonization, symbiotic interactions, and pathogenesis in the rhizosphere. This review will focus on the sources, transport mechanisms, and potential roles of the 20 canonical proteinogenic amino acids in the rhizosphere.

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“…At alkalinity, calcium phosphate solubility is limited, resulting in calcareous (Morel et Fardeau, 1989), but this variation may happens also in winter, where an increase in the relative volume of the liquid phase leading to a decrease in the electrolyte concentration, and thereby affecting the intensity of exchange processes, and at the end the H + ion content decreases which make increases the pH. In summer, the opposite phenomenon occurs, leading to an elevation in the soil pH (Morel et Fardeau, 1989), the latter phenomenon was found in the actual study, where the soil acidification was linked to the release of H+, inducing however an increase in the available phosphorus and consequently rises the uptake of P by plants, this is explained by the fact that acidification causes the dissolution of phosphate minerals (Hinsinger, 2001;Neumann et Romheld, 2002). Fertilizers also have an influence on soil pH (Morel et Pellerin, 2000), in this study the application of different doses of phosphorus have made a significant difference between the average pH during the pre-planting period.…”

Section: Discussionmentioning

confidence: 71%

Combined Effect of Three Pesticides (Zoom, Topik and Ortiva) and Phosphorus Fertilization on Some Physicochemical Parameters of Soil

Ketif¹,

Djamaï²,

Abdennour³

et al. 2014

JAS

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The purpose of this study was to verify the effect of three pesticides (Zoom, Topik and Ortiva) on some physicochemical parameters of soil. To do this, phosphate fertilizer was applied before planting and pesticides were sprayed pre-and post-emergence of Durum wheat. Particle size analysis showed that the soil was characterized by a clay texture and the value of residual humidity does not exceed 8%. The study of pH showed a remarkable seasonal variability; it was in the vicinity of neutrality at the beginning of culture (7.22) to the vicinity of acidity after crop harvest (5.78), thus the change in pH water was due to the phenomenon of dilution. The electrical conductivity proved that the soil was not saline. The content of soil organic matter was experiencing significant seasonal variation. After applying different doses of phosphate fertilizers, soil phosphorus varied remarkably with the seasons, which can be affected by adsorption, precipitation, heading stage, and the presence of clay cation Fe, Al and Ca. It was also noticed an increase in the content of soil available phosphorus during the tillering stage, which is due to the phenomenon of desorption and dissolution. The existence of traces of pesticides indicates that the Topik molecules are more resistant to degradation.

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Root-Induced Changes in the Availability of Nutrients in the Rhizosphere

Cited by 103 publications

References 0 publications

Acquisition of rock phosphate by combined application of ammonium fertilizers and Bacillus amyloliquefaciens FZB42 in maize as affected by soil pH

Acquisition of rock phosphate by combined application of ammonium fertilizers and Bacillus amyloliquefaciens FZB42 in maize as affected by soil pH

Amino acids in the rhizosphere: From plants to microbes

Combined Effect of Three Pesticides (Zoom, Topik and Ortiva) and Phosphorus Fertilization on Some Physicochemical Parameters of Soil

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