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Linking root structure to functionality: the impact of root system architecture on citrate enhanced phosphate uptake

Linking root structure to functionality: the impact of root system architecture on citrate enhanced phosphate uptake
Linking root structure to functionality: the impact of root system architecture on citrate enhanced phosphate uptake
Summary
• Root citrate exudation is thought to be important for phosphate solubilisation. Previous research has concluded that cluster-like roots benefit most from this exudation in terms of increased phosphate uptake, suggesting root structure plays an important role in citrate enhanced uptake (additional phosphate uptake due to citrate exudation).
• Time resolved computed tomography images of wheat root systems were used as the geometry for 3D citrate-phosphate solubilisation models. Citrate enhanced uptake was correlated with morphological measures of the root systems to determine which had the most benefit.
• A large variation of citrate enhanced uptake over 11 root structures was observed. Root surface area dominated absolute phosphate uptake but did not explain citrate enhanced uptake. Number of exuding root tips correlated well with citrate enhanced uptake. Root tips in close proximity could collectively exude high amounts of citrate, resulting in a delayed spike in citrate enhanced uptake.
• Root system architecture plays an important role in citrate enhanced uptake. Singular morphological measurements of the root systems cannot entirely explain variations in citrate enhanced uptake. Root systems with many tips would benefit greatly from citrate exudation. Quantifying citrate enhanced uptake experimentally is difficult as variations in root surface area would overwhelm citrate benefits.
Root system architecture, a-biotic stress, citrate, exudation, modelling, phosphorus
0028-646X
376-391
Mckay Fletcher, Daniel
db06e7e0-69af-4fa2-89b3-26f6599e43d4
Ruiz, Siul Aljadi
d79b3b82-7c0d-47cc-9616-11d29e6a41bd
Gerheim Souza Dias, Tiago
cbb905da-3e22-4933-8b7b-663c52345e3a
Petroselli, Chiara
19266726-2dc0-4790-af77-7ccdc45865eb
Roose, Tiina
3581ab5b-71e1-4897-8d88-59f13f3bccfe
Mckay Fletcher, Daniel
db06e7e0-69af-4fa2-89b3-26f6599e43d4
Ruiz, Siul Aljadi
d79b3b82-7c0d-47cc-9616-11d29e6a41bd
Gerheim Souza Dias, Tiago
cbb905da-3e22-4933-8b7b-663c52345e3a
Petroselli, Chiara
19266726-2dc0-4790-af77-7ccdc45865eb
Roose, Tiina
3581ab5b-71e1-4897-8d88-59f13f3bccfe

Mckay Fletcher, Daniel, Ruiz, Siul Aljadi, Gerheim Souza Dias, Tiago, Petroselli, Chiara and Roose, Tiina (2020) Linking root structure to functionality: the impact of root system architecture on citrate enhanced phosphate uptake. New Phytologist, 227 (2), 376-391. (doi:10.1111/nph.16554).

Record type: Article

Abstract

Summary
• Root citrate exudation is thought to be important for phosphate solubilisation. Previous research has concluded that cluster-like roots benefit most from this exudation in terms of increased phosphate uptake, suggesting root structure plays an important role in citrate enhanced uptake (additional phosphate uptake due to citrate exudation).
• Time resolved computed tomography images of wheat root systems were used as the geometry for 3D citrate-phosphate solubilisation models. Citrate enhanced uptake was correlated with morphological measures of the root systems to determine which had the most benefit.
• A large variation of citrate enhanced uptake over 11 root structures was observed. Root surface area dominated absolute phosphate uptake but did not explain citrate enhanced uptake. Number of exuding root tips correlated well with citrate enhanced uptake. Root tips in close proximity could collectively exude high amounts of citrate, resulting in a delayed spike in citrate enhanced uptake.
• Root system architecture plays an important role in citrate enhanced uptake. Singular morphological measurements of the root systems cannot entirely explain variations in citrate enhanced uptake. Root systems with many tips would benefit greatly from citrate exudation. Quantifying citrate enhanced uptake experimentally is difficult as variations in root surface area would overwhelm citrate benefits.

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More information

Accepted/In Press date: 3 March 2020
e-pub ahead of print date: 21 March 2020
Keywords: Root system architecture, a-biotic stress, citrate, exudation, modelling, phosphorus

Identifiers

Local EPrints ID: 438879
URI: http://eprints.soton.ac.uk/id/eprint/438879
ISSN: 0028-646X
PURE UUID: ce481dbd-2f92-49b2-8eeb-1bcfc23dda8a
ORCID for Daniel Mckay Fletcher: ORCID iD orcid.org/0000-0001-6569-2931
ORCID for Tiina Roose: ORCID iD orcid.org/0000-0001-8710-1063

Catalogue record

Date deposited: 26 Mar 2020 17:30
Last modified: 26 Nov 2021 07:15

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Contributors

Author: Daniel Mckay Fletcher ORCID iD
Author: Tiago Gerheim Souza Dias
Author: Chiara Petroselli
Author: Tiina Roose ORCID iD

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