The carboxylate composition of rhizosheath and root exudates from twelve species of grassland and crop legumes with special reference to the occurrence of citramalate

Daniel R. Kidd, Megan H. Ryan, Dorothee Hahne, Rebecca E. Haling, Hans Lambers, Graeme A. Sandral, Richard J. Simpson, Gregory R. Cawthray

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Abstract

Aims: Low-molecular-weight organic anions (carboxylates) influence rhizosphere processes and may enhance plant phosphorus acquisition. We examined the root exudate profile of a range of pasture and grain legumes and focused on the little-investigated carboxylate, citramalate. Methods: Twelve species of pasture legumes and herbs, including four Lotus spp. and two crop legumes, Cicer arietinum and Lupinus albus, were grown in a glasshouse for six weeks. The composition and amounts of carboxylates were measured in rhizosheath soil as well as in root exudates from roots washed free of their rhizosheath. Results: Citrate and malate were found in the rhizosheath of all species. However, citramalate was present in the rhizosheath of only Lotus species (10–82% of total exuded carboxylates). Cicer arietinum had the largest amount of carboxylates in its rhizosheath and fastest rate of carboxylate exudation into the trap solution. Conclusions: Citrate and malate were found in the rhizosheath of all species in this study, but citramalate was only found in the root exudates and rhizosheath of Lotus spp. Further investigation into the role of citramalate in Lotus spp. is merited.

Original languageEnglish
Pages (from-to)1-15
Number of pages15
JournalPlant and Soil
Volume424
Issue number1-2
Early online date2 Jan 2018
DOIs
Publication statusPublished - 1 Mar 2018

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Lotus
root exudates
legumes
grasslands
grassland
crop
forage legumes
malates
Cicer arietinum
crops
citrates
pasture
exudation
Lupinus albus
anions
herb
rhizosphere
anion
herbs
traps

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@article{da01ae9d86f44b1d980db16a21dfd72b,
title = "The carboxylate composition of rhizosheath and root exudates from twelve species of grassland and crop legumes with special reference to the occurrence of citramalate",
abstract = "Aims: Low-molecular-weight organic anions (carboxylates) influence rhizosphere processes and may enhance plant phosphorus acquisition. We examined the root exudate profile of a range of pasture and grain legumes and focused on the little-investigated carboxylate, citramalate. Methods: Twelve species of pasture legumes and herbs, including four Lotus spp. and two crop legumes, Cicer arietinum and Lupinus albus, were grown in a glasshouse for six weeks. The composition and amounts of carboxylates were measured in rhizosheath soil as well as in root exudates from roots washed free of their rhizosheath. Results: Citrate and malate were found in the rhizosheath of all species. However, citramalate was present in the rhizosheath of only Lotus species (10–82{\%} of total exuded carboxylates). Cicer arietinum had the largest amount of carboxylates in its rhizosheath and fastest rate of carboxylate exudation into the trap solution. Conclusions: Citrate and malate were found in the rhizosheath of all species in this study, but citramalate was only found in the root exudates and rhizosheath of Lotus spp. Further investigation into the role of citramalate in Lotus spp. is merited.",
keywords = "Citrate, Exudation, Lotus, Organic acids, Phosphorus, Rhizosheath",
author = "Kidd, {Daniel R.} and Ryan, {Megan H.} and Dorothee Hahne and Haling, {Rebecca E.} and Hans Lambers and Sandral, {Graeme A.} and Simpson, {Richard J.} and Cawthray, {Gregory R.}",
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language = "English",
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journal = "Plant and Soil: An International Journal on Plant-Soil Relationships",
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}

The carboxylate composition of rhizosheath and root exudates from twelve species of grassland and crop legumes with special reference to the occurrence of citramalate. / Kidd, Daniel R.; Ryan, Megan H.; Hahne, Dorothee; Haling, Rebecca E.; Lambers, Hans; Sandral, Graeme A.; Simpson, Richard J.; Cawthray, Gregory R.

In: Plant and Soil, Vol. 424, No. 1-2, 01.03.2018, p. 1-15.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The carboxylate composition of rhizosheath and root exudates from twelve species of grassland and crop legumes with special reference to the occurrence of citramalate

AU - Kidd, Daniel R.

AU - Ryan, Megan H.

AU - Hahne, Dorothee

AU - Haling, Rebecca E.

AU - Lambers, Hans

AU - Sandral, Graeme A.

AU - Simpson, Richard J.

AU - Cawthray, Gregory R.

PY - 2018/3/1

Y1 - 2018/3/1

N2 - Aims: Low-molecular-weight organic anions (carboxylates) influence rhizosphere processes and may enhance plant phosphorus acquisition. We examined the root exudate profile of a range of pasture and grain legumes and focused on the little-investigated carboxylate, citramalate. Methods: Twelve species of pasture legumes and herbs, including four Lotus spp. and two crop legumes, Cicer arietinum and Lupinus albus, were grown in a glasshouse for six weeks. The composition and amounts of carboxylates were measured in rhizosheath soil as well as in root exudates from roots washed free of their rhizosheath. Results: Citrate and malate were found in the rhizosheath of all species. However, citramalate was present in the rhizosheath of only Lotus species (10–82% of total exuded carboxylates). Cicer arietinum had the largest amount of carboxylates in its rhizosheath and fastest rate of carboxylate exudation into the trap solution. Conclusions: Citrate and malate were found in the rhizosheath of all species in this study, but citramalate was only found in the root exudates and rhizosheath of Lotus spp. Further investigation into the role of citramalate in Lotus spp. is merited.

AB - Aims: Low-molecular-weight organic anions (carboxylates) influence rhizosphere processes and may enhance plant phosphorus acquisition. We examined the root exudate profile of a range of pasture and grain legumes and focused on the little-investigated carboxylate, citramalate. Methods: Twelve species of pasture legumes and herbs, including four Lotus spp. and two crop legumes, Cicer arietinum and Lupinus albus, were grown in a glasshouse for six weeks. The composition and amounts of carboxylates were measured in rhizosheath soil as well as in root exudates from roots washed free of their rhizosheath. Results: Citrate and malate were found in the rhizosheath of all species. However, citramalate was present in the rhizosheath of only Lotus species (10–82% of total exuded carboxylates). Cicer arietinum had the largest amount of carboxylates in its rhizosheath and fastest rate of carboxylate exudation into the trap solution. Conclusions: Citrate and malate were found in the rhizosheath of all species in this study, but citramalate was only found in the root exudates and rhizosheath of Lotus spp. Further investigation into the role of citramalate in Lotus spp. is merited.

KW - Citrate

KW - Exudation

KW - Lotus

KW - Organic acids

KW - Phosphorus

KW - Rhizosheath

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DO - 10.1007/s11104-017-3534-0

M3 - Article

VL - 424

SP - 1

EP - 15

JO - Plant and Soil: An International Journal on Plant-Soil Relationships

JF - Plant and Soil: An International Journal on Plant-Soil Relationships

SN - 0032-079X

IS - 1-2

ER -