The effect of natural seed coatings of Capsella bursa-pastoris L. Medik. (shepherd’s purse) on soil-water retention, stability and hydraulic conductivity

Deng, Wenni; Hallett, Paul D.; Jeng, Dong‐Sheng; Squire, G. R.; Toorop, Peter E.; Iannetta, Pietro P. M.

doi:10.1007/s11104-014-2281-8

Cited by 32 publications

(40 citation statements)

References 37 publications

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“…Similar observations were made by Deng et al [2014], who investigated the effect of mucilage exuded from the seed coating of Capsella bursa-pastoris L. Medik. on the water retention curve of a sandy clay loam.…”

Section: Introductionsupporting

confidence: 77%

Water percolation through the root-soil interface

Benard

Kroener

Vontobel

et al. 2016

Advances in Water Resources

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Section: Introductionsupporting

confidence: 77%

Water percolation through the root-soil interface

Benard

Kroener

Vontobel

et al. 2016

Advances in Water Resources

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“…Kroener et al (2014) showed that for mucilage from chia seeds the effect of water adsorption was dominant, as the water content of soils mixed with mucilage was higher than in soils without mucilage. A similar result was obtained for mucilage from other seed coatings (Deng et al, 2015) and for an extracellular polymeric substance (EPS) analog (xanthan) (Rosenzweig et al, 2012).…”

supporting

confidence: 75%

Water for Carbon, Carbon for Water

Carminati

Kroener

Ahmed

et al. 2016

Vadose Zone Journal

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Core Ideas Mucilage exuded by roots modifies the hydraulic properties of the rhizosphere. In turn, the rhizosphere hydraulic properties affect transpiration and photosynthesis. These water–carbon feedbacks in the rhizosphere help plant performance in dry soils. Plant roots exude approximately 10% of the carbon assimilated through photosynthesis into the soil, a process referred to as rhizodeposition. Here, we show that the mucilaginous fraction of the rhizodeposits, referred to as mucilage, plays a crucial role on soil–plant water relation and it has the potential to increase plant drought tolerance. Mucilage is a gel that can absorb large volumes of water, altering the physical properties of the rhizosphere and maintaining the rhizosphere wet and conductive when the soil dries. It is hypothesized that mucilage acts as a hydraulic bridge between roots and the soil, facilitating root water uptake and maintaining transpiration in dry soils. By employing a simplified model of root water uptake coupled with mucilage dynamics, we found that in a sandy soil the benefit of mucilage in maintaining root water uptake commenced to manifest when the soil matric potential dropped below approximately −0.8 MPa. This critical matric potential varied with transpiration rate, root length, and exudation rate. Below the critical potential, mucilage maintained photosynthesis and resulted in a net gain of carbon. In summary, rhizodeposition modifies the physical soil environment and has an impact on transpiration and photosynthesis. In other words: water for carbon, but also carbon for water.

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“…Although exudation clearly represents a significant carbon cost to the plant, exudates are involved in engineering the rhizosphere by dispersion and gelling of soil (Naveed et al 2017;Barré and Hallett 2009;Tarchitzky and Chen 2002;Deng et al 2015), modulation of water and nutrient availabilities (Wang et al 2008;Ahmed et al 2014;Deng et al 2015), and attraction of rhizobacteria (Bais et al 2006). To our knowledge this is the first time that plant exudates have been demonstrated to ease soil compression and thus offer the potential for increased root elongation in soil.…”

Section: Discussionmentioning

confidence: 99%

“…(Chia) or Capsella sp. (Deng et al 2015). Major chemical components of root exudates, such as polygalacturonic acid (Czarnes et al 2000), or biological exudates like xanthan produced by bacteria or scleroglucan produced by fungi, have also been used (Peng et al 2011;Carminati and Vetterlein 2013;Carminati et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Plant exudates improve the mechanical conditions for root penetration through compacted soils

et al. 2017

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Background and aim Plant exudates greatly affect the physical behaviour of soil, but measurements of the impact of exudates on compression characteristics are missing. Our aim is to provide these data and explore how plant exudates may enhance the restructuring of compacted soils following cycles of wetting and drying. Methods Two soils were amended with Chia (Salvia hispanica) seed exudate at 5 concentrations, compacted in cores to 200 kPa stress (equivalent to tractor stress), equilibrated to −50 kPa matric potential, and then compacted to 600 kPa (equivalent to axial root stress) followed by 3 cycles of wetting and drying and recompression to 600 kPa at −50 kPa matric potential. Penetration resistance (PR), compression index (C C ) and pore characteristics were measured at various steps.

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The effect of natural seed coatings of Capsella bursa-pastoris L. Medik. (shepherd’s purse) on soil-water retention, stability and hydraulic conductivity

Cited by 32 publications

References 37 publications

Water percolation through the root-soil interface

Water percolation through the root-soil interface

Water for Carbon, Carbon for Water

Plant exudates improve the mechanical conditions for root penetration through compacted soils

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