Journal ArticleDOI
Influence of sorption on the biological utilization of two simple carbon substrates
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In this article, the utilization of glucose and citrate either with or without being mixed with one of four commonlyoccurring soil mineral phases was assessed using both bacterial cultures and soil incubations.Abstract:
The utilization of glucose and citrate either with or without being mixed with one of four commonly-occurring soil mineral phases was assessed using both bacterial cultures and soil incubations. Citrate and glucose, both 14 C-labelled, were added separately to bacterial cultures. In each case they were rapidly degraded with >60% recovered as CO 2 . In the presence of soil the respired proportion declined especially for glucose. The presence of mineral phases (illite–mica, kaolinite, mixed soil clay or ferric hydroxide) had little observable affect on the utilization of glucose in either bacterial cultures or soil. However, ferric hydroxide did induce an alteration in the way 14 C was partitioned within the microbial cells. In contrast, citrate degradation was greatly reduced over short periods (6–22 h) in the presence of the three clay materials and almost completely inhibited by the presence of ferric hydroxide. The importance of substrate sorption in the context of carbon utilization in the rhizosphere is discussed.read more
Citations
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Journal ArticleDOI
Organic acids in the rhizosphere: a critical review
TL;DR: In this article, a review of the role of organic acids in rhizosphere processes is presented, which includes information on organic acid levels in plants (concentrations, compartmentalisation, spatial aspects, synthesis), plant efflux (passive versus active transport, theoretical versus experimental considerations), soil reactions (soil solution concentrations, sorption) and microbial considerations (mineralization).
Journal ArticleDOI
Bioavailability of soil inorganic P in the rhizosphere as affected by root-induced chemical changes: A review
TL;DR: In this paper, the authors give an overview of those chemical processes that are directly induced by plant roots and which can affect the concentration of P in the soil solution and, ultimately, the bioavailability of soil inorganic P to plants.
Journal ArticleDOI
Is soil carbon mostly root carbon? Mechanisms for a specific stabilisation
TL;DR: In this article, the authors discuss the main SOM stabilisation mechanisms with respect to their ability to specifically protect root-derived organic matter (SOM) and show that rootC has a longer residence time in soil than shootC.
Journal ArticleDOI
The role of DOM sorption to mineral surfaces in the preservation of organic matter in soils.
Klaus Kaiser,Georg Guggenberger +1 more
TL;DR: In this paper, the authors investigated the role of dissolved organic matter (DOM) in the preservation of organic matter in marine sediments and found that DOM sorption contributes considerably to the accumulation and preservation of OM in soil.
Journal ArticleDOI
Controls of bioavailability and biodegradability of dissolved organic matter in soils
Bernd Marschner,Karsten Kalbitz +1 more
TL;DR: In this article, the controlling factors for DOM biodegradability can be divided into three groups, namely, intrinsic DOM quality parameters, soil and solution parameters and external factors, and the major obstacle for a better understanding of the controlled properties of DOM is the lack of a standardised methodology or at least systematic comparisons between the large number of methods used to assess DOM bioregradability.
References
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Book
The Mineral Nutrition of Higher Plants
M. H. Martin,H. Marschner +1 more
TL;DR: This chapter discusses the relationship between Mineral Nutrition and Plant Diseases and Pests, and the Soil-Root Interface (Rhizosphere) in Relation to Mineral Nutrition.
Book
Mineral Nutrition of Higher Plants
TL;DR: In this article, the authors discuss the relationship between mineral nutrition and plant diseases and pests, and diagnose deficiency and toxicity of mineral nutrients in leaves and other aerial parts of a plant.
Journal ArticleDOI
Substrate flow in the rhizosphere
James M. Lynch,J. M. Whipps +1 more
TL;DR: The major source of substrates for microbial activity in the ectorhizosphere and on the rhizoplane are rhizodeposition products, which are composed of exudates, lysates, mucilage, secretions and dead cell material, as well as gases including respiratory CO2 as discussed by the authors.
Journal ArticleDOI
Aluminum Tolerance in Wheat (Triticum aestivum L.) (II. Aluminum-Stimulated Excretion of Malic Acid from Root Apices)
TL;DR: There was a consistent correlation of Al tolerance with high rates of malic acid excretion stimulated by Al in a population of seedlings segregating for Al tolerance, consistent with the hypothesis that the Alt1 locus in wheat encodes an Al tolerance mechanism based on Al-stimulated excretion ofmalic acid.
Journal ArticleDOI
Solubilization of rock phosphate by rape I. Evaluation of the role of the nutrient uptake pattern.
TL;DR: In this paper, local rhizosphere acidification by rape as a reaction to P-starvation was visualized by means of an agar plate technique, and local differences in cation-anion uptake and organic acid exudation along intact roots of rape were observed for plants grown on nutrient solution with or without added P.
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The role of DOM sorption to mineral surfaces in the preservation of organic matter in soils.
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