Interface sol-racine—I

Guckert, Armand; Breisch, H.; Reisinger, O.

doi:10.1016/0038-0717(75)90061-9

Cited by 55 publications

(3 citation statements)

References 12 publications

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“…Al, Cd, Zn, Cu), protecting the root meristem (Morel et al 1986;Mench et al 1987). In addition, mucilage enhances soil aggregate stability which in the longterm promotes soil aeration, root growth and reduces soil erosion (Guckert et al 1975;Morel et al 1990;Czarnes et al 2000). Mucilage also possesses a high intrinsic affinity for water and when fully hydrated, has a water content 100,000 times greater than its dry weight (McCully and Boyer 1997) and expands to form a viscous droplet covering the root tip.…”

Section: Mucilagementioning

confidence: 97%

Carbon flow in the rhizosphere: carbon trading at the soil–root interface

Jones

Nguyen²,

Finlay³

2009

Plant Soil

1,352

769

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The loss of organic and inorganic carbon from roots into soil underpins nearly all the major changes that occur in the rhizosphere. In this review we explore the mechanistic basis of organic carbon and nitrogen flow in the rhizosphere. It is clear that C and N flow in the rhizosphere is extremely complex, being highly plant and environment dependent and varying both spatially and temporally along the root. Consequently, the amount and type of rhizodeposits (e.g. exudates, border cells, mucilage) remains highly context specific. This has severely limited our capacity to quantify and model the amount of rhizodeposition in ecosystem processes such as C sequestration and nutrient acquisition. It is now evident that C and N flow at the soil-root interface is bidirectional with C and N being lost from roots and taken up from the soil simultaneously. Here we present four alternative hypotheses to explain why high and low molecular weight organic compounds are actively cycled in the rhizosphere. These include:(1) indirect, fortuitous root exudate recapture as part of the root's C and N distribution network, (2) direct re-uptake to enhance the plant's C efficiency and to reduce rhizosphere microbial growth and pathogen attack, (3) direct uptake to recapture organic nutrients released from soil organic matter, and (4) for interroot and root-microbial signal exchange. Due to severe flaws in the interpretation of commonly used isotopic labelling techniques, there is still great uncertainty surrounding the importance of these individual fluxes in the rhizosphere. Due to the importance of rhizodeposition in regulating ecosystem functioning, it is critical that future research focuses on resolving the quantitative importance of the different C and N fluxes operating in the rhizosphere and the ways in which these vary spatially and temporally.

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Section: Mucilagementioning

confidence: 97%

Carbon flow in the rhizosphere: carbon trading at the soil–root interface

Jones

Nguyen²,

Finlay³

2009

Plant Soil

1,352

769

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“…Root and bacterial mucilages may create a sheath around roots and affect soil structure by diffusing in the pore space upon hydration and binding soil particles (Watt et al 1993(Watt et al , 1994Czarnes et al 2000). In the presence of biological exudates or their analogues soil structure stability often increases (Tisdall et al 1978;Cheshire 1979;Amellal et al 1998;Guckert et al 1975;Tisdall and Oades 1982) and soil water holding capacity is higher (Chenu and Guèrif 1991;Carminati and Vetterlein 2013). The main compounds found in mucilages are polysaccharidic gums and their chemical composition plays an important role in soil binding properties; soil strength (Czarnes et al 2000) or aggregate stability (Traorè et al 2000), for instance, are improved by xanthan (Czarnes et al 2000) and polygalacturonic acid (PGA) (Traorè et al 2000;Czarnes et al 2000) more than bydextran (Czarnes et al 2000).…”

Section: Introductionmentioning

confidence: 99%

Mucilage from fruits/seeds of chia (Salvia hispanica L.) improves soil aggregate stability

et al. 2018

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Background and aims Myxodiaspores have been shown to enhance soil-seed contact and improve soil stability. We aim to demonstrate the effect of myxodiaspory on the stability of soil aggregates and gain insight on the nature of bonds. Methods Mucilage extracted from chia (Salvia hispanica L.) fruits after hydration was mixed with three soils (sandyloam, loam, clay loam), incubated and tested at different times up to 30 days. We measured aggerate stability by wet sieving and the dynamics of soil CO 2 evolution. SEM imaging and 13 CPMAS spectroscopy of mucilage were performed in order to infer mechanisms of soil stabilization. ResultsThe incorporation of mucilage resulted in a dose-and soil-dependent rise in aggregate stability.The dose of 2% mucilage overcame textural effects on soil aggregate stability by providing a 2.3-fold stability increase in the loam and clay-loam and a 4.9-fold increase in the sandy-loam compared to control. The effect persisted after 30 days in spite of C losses due to soil respiration. Mechanisms of soil bonding analogous to xanthan can be inferred from SEM imaging and 13 C-CPMAS, since the mucilage was identified as a biopolymer containing 93.39% carbohydrates and 22.02% uronic acids. Conclusions We demonstrate that mucilage extruded by hydrated diaspores strongly increases soil aggregate stability. This represents a potentially important ecosystem service provided by myxodiasporous crops during germination. Our findings confirm potential applications of mucilage from myxodiaspores as natural soil stabilizers.

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“…This conclusion, however, is apparently contradicted by the appearance of expanded mucilage in micrographs of the root-soil interface (e.g. Greaves and Darbyshire 1972, Guckert et al 1975, Vermeer and McCully 1982, Foster et al 1983. A possible reason for this discrepancy is that the high value for y^^ of the mucilage determined by Guinel and McCully (1986) may be wrong: there is difficulty in making accurate determinations of the freezing point of gels.…”

Section: Introductionmentioning

confidence: 99%

The expansion of maize root‐cap mucilage during hydration. 3. Changes in water potential and water content

McCully

Boyer

1997

Physiologia Plantarum

127

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1997. The expansion of maize root-cap mucilage during hydration. 3. Changes in water potential and water content. -Physiol. Plant. 99; 169-177.Root-cap mucilage from aerial nodal roots of maize has been found to have water potential values of -11 MPa or lower when air dried. The value approaches 0 MPa within 2 min of hydration in distilled water. In this time the expanding gel absorbs only about 0.3% of the water content of fully expanded mucilage. It is concluded that the root-cap mucilage per se has almost no capacity to retain water in the rhizosphere. Any function that it may play in the slowing of root desiccation would be indirect. For example, mucilage might decrease pore size between and within soil aggregates by pulling the particles together in a cycle of nocturnal efflux of water from the root surface, and diumal drying during transpiration.

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Interface sol-racine—I

Cited by 55 publications

References 12 publications

Carbon flow in the rhizosphere: carbon trading at the soil–root interface

Carbon flow in the rhizosphere: carbon trading at the soil–root interface

Mucilage from fruits/seeds of chia (Salvia hispanica L.) improves soil aggregate stability

The expansion of maize root‐cap mucilage during hydration. 3. Changes in water potential and water content

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