Plant roots release phospholipid surfactants that modify the physical and chemical properties of soil

D. B. Read, A. Glyn Bengough, Peter J. Gregory, John W. Crawford, D. Robinson, C. M. Scrimgeour, Iain M. Young, K. Zhang, Xiaoxian Zhang

Research output: Contribution to journalArticle

  • 111 Citations

Abstract

•Plant root mucilages contain powerful surfactants that will alter the interaction of soil solids with water and ions, and the rates of microbial processes.
•The lipid composition of maize, lupin and wheat root mucilages was analysed by thin layer chromatography and gas chromatography-mass spectrometry. A commercially available phosphatidylcholine (lecithin), chemically similar to the phospholipid surfactants identified in the mucilages, was then used to evaluate its effects on selected soil properties.
•The lipids found in the mucilages were principally phosphatidylcholines, composed mainly of saturated fatty acids, in contrast to the lipids extracted from root tissues. In soil at low tension, lecithin reduced the water content at any particular tension by as much as 10 and 50% in soil and acid-washed sand, respectively. Lecithin decreased the amount of phosphate adsorption in soil and increased the phosphate concentration in solution by 10%. The surfactant also reduced net rates of ammonium consumption and nitrate production in soil.
•These experiments provide the first evidence we are aware of that plant-released surfactants will significantly modify the biophysical environment of the rhizosphere.
Original languageEnglish
Pages (from-to)315-326
Number of pages12
JournalNew Phytologist
Volume157
Issue number2
DOIs
StatePublished - Feb 2003

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surfactants
phosphatidylcholines
soil
Plant Roots
Surface-Active Agents
Phospholipids
Soil
mucilages
Lecithins
Lipids
phospholipids
phosphates
lipids
Phosphatidylcholines
Phosphates
Water
Lupinus
soil chemical properties
lipid composition
thin layer chromatography

Cite this

Read, D. B., Bengough, A. G., Gregory, P. J., Crawford, J. W., Robinson, D., Scrimgeour, C. M., ... Zhang, X. (2003). Plant roots release phospholipid surfactants that modify the physical and chemical properties of soil. New Phytologist, 157(2), 315-326. DOI: 10.1046/j.1469-8137.2003.00665.x

Read, D. B.; Bengough, A. Glyn; Gregory, Peter J.; Crawford, John W.; Robinson, D.; Scrimgeour, C. M.; Young, Iain M.; Zhang, K.; Zhang, Xiaoxian / Plant roots release phospholipid surfactants that modify the physical and chemical properties of soil.

In: New Phytologist, Vol. 157, No. 2, 02.2003, p. 315-326.

Research output: Contribution to journalArticle

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abstract = "•Plant root mucilages contain powerful surfactants that will alter the interaction of soil solids with water and ions, and the rates of microbial processes.•The lipid composition of maize, lupin and wheat root mucilages was analysed by thin layer chromatography and gas chromatography-mass spectrometry. A commercially available phosphatidylcholine (lecithin), chemically similar to the phospholipid surfactants identified in the mucilages, was then used to evaluate its effects on selected soil properties.•The lipids found in the mucilages were principally phosphatidylcholines, composed mainly of saturated fatty acids, in contrast to the lipids extracted from root tissues. In soil at low tension, lecithin reduced the water content at any particular tension by as much as 10 and 50% in soil and acid-washed sand, respectively. Lecithin decreased the amount of phosphate adsorption in soil and increased the phosphate concentration in solution by 10%. The surfactant also reduced net rates of ammonium consumption and nitrate production in soil.•These experiments provide the first evidence we are aware of that plant-released surfactants will significantly modify the biophysical environment of the rhizosphere.",
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Read, DB, Bengough, AG, Gregory, PJ, Crawford, JW, Robinson, D, Scrimgeour, CM, Young, IM, Zhang, K & Zhang, X 2003, 'Plant roots release phospholipid surfactants that modify the physical and chemical properties of soil' New Phytologist, vol 157, no. 2, pp. 315-326. DOI: 10.1046/j.1469-8137.2003.00665.x

Plant roots release phospholipid surfactants that modify the physical and chemical properties of soil. / Read, D. B.; Bengough, A. Glyn; Gregory, Peter J.; Crawford, John W.; Robinson, D.; Scrimgeour, C. M.; Young, Iain M.; Zhang, K.; Zhang, Xiaoxian.

In: New Phytologist, Vol. 157, No. 2, 02.2003, p. 315-326.

Research output: Contribution to journalArticle

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T1 - Plant roots release phospholipid surfactants that modify the physical and chemical properties of soil

AU - Read,D. B.

AU - Bengough,A. Glyn

AU - Gregory,Peter J.

AU - Crawford,John W.

AU - Robinson,D.

AU - Scrimgeour,C. M.

AU - Young,Iain M.

AU - Zhang,K.

AU - Zhang,Xiaoxian

PY - 2003/2

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N2 - •Plant root mucilages contain powerful surfactants that will alter the interaction of soil solids with water and ions, and the rates of microbial processes.•The lipid composition of maize, lupin and wheat root mucilages was analysed by thin layer chromatography and gas chromatography-mass spectrometry. A commercially available phosphatidylcholine (lecithin), chemically similar to the phospholipid surfactants identified in the mucilages, was then used to evaluate its effects on selected soil properties.•The lipids found in the mucilages were principally phosphatidylcholines, composed mainly of saturated fatty acids, in contrast to the lipids extracted from root tissues. In soil at low tension, lecithin reduced the water content at any particular tension by as much as 10 and 50% in soil and acid-washed sand, respectively. Lecithin decreased the amount of phosphate adsorption in soil and increased the phosphate concentration in solution by 10%. The surfactant also reduced net rates of ammonium consumption and nitrate production in soil.•These experiments provide the first evidence we are aware of that plant-released surfactants will significantly modify the biophysical environment of the rhizosphere.

AB - •Plant root mucilages contain powerful surfactants that will alter the interaction of soil solids with water and ions, and the rates of microbial processes.•The lipid composition of maize, lupin and wheat root mucilages was analysed by thin layer chromatography and gas chromatography-mass spectrometry. A commercially available phosphatidylcholine (lecithin), chemically similar to the phospholipid surfactants identified in the mucilages, was then used to evaluate its effects on selected soil properties.•The lipids found in the mucilages were principally phosphatidylcholines, composed mainly of saturated fatty acids, in contrast to the lipids extracted from root tissues. In soil at low tension, lecithin reduced the water content at any particular tension by as much as 10 and 50% in soil and acid-washed sand, respectively. Lecithin decreased the amount of phosphate adsorption in soil and increased the phosphate concentration in solution by 10%. The surfactant also reduced net rates of ammonium consumption and nitrate production in soil.•These experiments provide the first evidence we are aware of that plant-released surfactants will significantly modify the biophysical environment of the rhizosphere.

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Read DB, Bengough AG, Gregory PJ, Crawford JW, Robinson D, Scrimgeour CM et al. Plant roots release phospholipid surfactants that modify the physical and chemical properties of soil. New Phytologist. 2003 Feb;157(2):315-326. Available from, DOI: 10.1046/j.1469-8137.2003.00665.x