Root hairs and the acquisition of plant nutrients from soil

Jungk, A.

doi:10.1002/1522-2624(200104)164:2<121::aid-jpln121>3.0.co;2-6

Cited by 267 publications

(152 citation statements)

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“…[67] The deployment time for DGT is mostly 24 h. The uptake period during plant growth is usually several weeks, but the period during which they effectively acquire nutrients from a specific volume of soil can be much shorter, because of root growth and localised uptake along the root. [79,80] Third, the root geometry is different from that of the DGT device. Roots with a small radius can sustain a larger diffusion flux than thicker roots because of geometric considerations, but the effect of root radius on the (surface area based) diffusion flux is generally small.…”

Section: Dgt As Predictor Of Plant Availability?mentioning

confidence: 99%

“…It has indeed been shown that root hairs may play an important role in the uptake of phosphate, and that some plant species respond to low P availability by growing longer and denser root hairs. [79] Finally, plants alter the soil surrounding the roots ('rhizosphere'), which may affect the speciation of trace metals as well as of phosphate. For instance, the rhizosphere pH may be different from that in the bulk solution.…”

Section: Dgt As Predictor Of Plant Availability?mentioning

confidence: 99%

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Predicting availability of mineral elements to plants with the DGT technique: a review of experimental data and interpretation by modelling

et al. 2009

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Environmental context. Total concentrations of mineral elements in soil bear little relation to their availability for plants. The DGT (diffusive gradients in thin-films) technique has been found to be a good predictor of trace metal uptake and P deficiency, though not consistently in all studies for all elements. This review examines the fundamental basis for the relation between DGT fluxes and plant uptake and assesses under which conditions this relation may break down.Abstract. In the DGT technique, elements are accumulated on a binding gel after their diffusive transport through a hydrogel. In this paper, we explore in more detail why -and under which conditions -DGT correlates with plant uptake. The theoretical considerations are illustrated with experimental results for metal uptake and toxicity, and for phosphorus deficiency. Strong correlations between DGT and plant uptake are predicted if the diffusive transport of the element from soil to the plant roots is rate-limiting for its uptake. If uptake is not limited by diffusive transport, DGT-fluxes and plant uptake may still correlate provided that plant uptake is not saturated. However, competitive cations may affect the plant uptake under these conditions, whereas they have no effect on the DGT flux. Moreover, labile complexes are not expected to contribute to the plant uptake if diffusion is not limiting, but they are measured with DGT. Therefore, if plant uptake is not limited by diffusion, interpretation of the observed correlation in terms of the labile species measured by DGT is inappropriate.

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Section: Dgt As Predictor Of Plant Availability?mentioning

confidence: 99%

Section: Dgt As Predictor Of Plant Availability?mentioning

confidence: 99%

Predicting availability of mineral elements to plants with the DGT technique: a review of experimental data and interpretation by modelling

et al. 2009

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“…Root hairs can contribute up to 67% of the total root surface area (Nielsen et al, 2001). Root hairs are subcellular extensions of the root epidermis that contribute to the acquisition of immobile nutrients such as phosphorus (Jungk, 2001). Root hair production is stimulated by the deficiency of several nutrients, including iron, zinc, manganese, and phosphorus, but, at least in Arabidopsis, phosphorus has a greater effect than other nutrients on root hair density and length (Bates & Lynch, 1996;Ma et al, 2001).…”

Section: Método De Avaliação De Pêlos Radicais De Genótipos De Feijãomentioning

confidence: 99%

Method for evaluation of root hairs of common bean genotypes

Vieira

Jochua

Lynch

2007

Pesq. agropec. bras.

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-The objective of this work was to test a simple method for root hair evaluation of 21 common bean (Phaseolus vulgaris) genotypes, most of them used in breeding programs in Brazil. Hairs of basal and primary roots of 5-day old seedlings, produced on germination paper with no phosphorus addition, were visually evaluated by a rating scale after staining with 0.05% trypan blue. The method reveals variability among the genotypes, and the standard error of the mean is relatively low.

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“…They are also preferential exudation sites of compounds (carboxylates and plant siderophores), which can be released, especially in the early growth stages, when cell walls are being formed and when the cell conductivity of water and soluble substances is high (Michael, 2001). Depending on the environmental and genetic factors, root hairs vary in number, length and longevity (Jungk, 2001). According to Föhse & Jungk (1983), the development of root hairs is strongly influenced by the supply of mineral nutrients, especially P. The authors found that at high P concentrations, root hairs were absent or only rudimentary in rape, spinach and tomato plants, but increased in number and length at low concentrations.…”

Section: Introductionmentioning

confidence: 99%

Rhizosphere properties of maize genotypes with contrasting phosphorus efficiency

Brasil

Alves

Marriel

et al. 2011

Rev. Bras. Ciênc. Solo

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SUMMARYAn experiment was conducted in a growth chamber to evaluate characteristics of the rhizosphere of maize genotypes contrasting in P-use efficiency, by determining length and density of root hairs, the rhizosphere pH and the functional diversity of rhizosphere bacteria. A sample of a Red Oxisol was limed and fertilized with N, K and micronutrients. In the treatment with the highest P level, 174 mg kg -1 P was added. Each experimental unit corresponded to a PVC rhizobox filled with 2.2 dm -3 soil. The experiment was completely randomized with three replications in a 5 x 2 factorial design, corresponding to five genotypes (H1, H2 and H3 = P-efficient hybrids, H4 and H5 = P-inefficient hybrids) and two P levels (low = 3 mg dm -3 , high = 29 mg dm -3 ). It was found that 18 days after transplanting, the nodal roots of the hybrids H3 and H2 had the longest root hairs. In general, the pH in the rhizosphere of the different genotypes was higher than in non-rhizosphere soil, irrespective of the P level. The pH was higher in the rhizosphere of lateral than of nodal roots. At low P levels, the pH variation of the hybrids H2, H4 and H5 was greater in rhizospheric than in non-rhizospheric soil. The functional microbial activity in the rhizosphere of the hybrids H3 and H5 was highest. At low soil P levels, the indices of microbial functional diversity were also higher. The microbial metabolic profile in the rhizosphere of hybrids H1, H2, H3, and H5 remained unaltered when the plants were grown at low P. The variations in the rhizosphere properties could not be related to patterns of P-use efficiency in the tested genotypes.Index terms: P-acquisition, mechanisms, rizobox.

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Root hairs and the acquisition of plant nutrients from soil

Cited by 267 publications

References 0 publications

Predicting availability of mineral elements to plants with the DGT technique: a review of experimental data and interpretation by modelling

Predicting availability of mineral elements to plants with the DGT technique: a review of experimental data and interpretation by modelling

Method for evaluation of root hairs of common bean genotypes

Rhizosphere properties of maize genotypes with contrasting phosphorus efficiency

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