The University of Southampton
University of Southampton Institutional Repository

Enhanced zinc uptake by rice through phytosiderophore secretion: a modelling study

Enhanced zinc uptake by rice through phytosiderophore secretion: a modelling study
Enhanced zinc uptake by rice through phytosiderophore secretion: a modelling study
Rice (Oryza sativa L.) secretes far smaller amounts of metal-complexing phytosiderophores (PS) than other grasses. But there is increasing evidence that it relies on PS secretion for its zinc (Zn) uptake. After nitrogen, Zn deficiency is the most common nutrient disorder in rice, affecting up to 50% of lowland rice soils globally. We developed a mathematical model of PS secretion from roots and resulting solubilization and uptake of Zn, allowing for root growth, diurnal variation in secretion, decomposition of the PS in the soil, and the transport and interaction of the PS and Zn in the soil. A sensitivity analysis showed that with realistic parameter values for rice in submerged soil, the typically observed rates of PS secretion from rice are sufficient and necessary to explain observed rates of Zn uptake. There is little effect of diurnal variation in secretion on cumulative Zn uptake, irrespective of other model parameter values, indicating that the observed diurnal variation is not causally related to Zn uptake efficiency. Rooting density has a large effect on uptake per unit PS secretion as a result of overlap of the zones of influence of neighbouring roots. The effects of other complications in the rice rhizosphere are discussed.
cereal, micronutrient, mugineic acid, rhizosphere, solubilization
0140-7791
2038-2046
Ptashnyk, Mariya
b76c5285-4875-45cd-bd4c-613cc8cd329a
Roose, Tiina
3581ab5b-71e1-4897-8d88-59f13f3bccfe
Jones, Davey L.
c8e739a8-07d9-4c32-a0d2-e95c7754d168
Kirk, Guy J.D.
7003ce14-2e44-4b1a-a407-9e4e3ffd7660
Ptashnyk, Mariya
b76c5285-4875-45cd-bd4c-613cc8cd329a
Roose, Tiina
3581ab5b-71e1-4897-8d88-59f13f3bccfe
Jones, Davey L.
c8e739a8-07d9-4c32-a0d2-e95c7754d168
Kirk, Guy J.D.
7003ce14-2e44-4b1a-a407-9e4e3ffd7660

Ptashnyk, Mariya, Roose, Tiina, Jones, Davey L. and Kirk, Guy J.D. (2011) Enhanced zinc uptake by rice through phytosiderophore secretion: a modelling study. Plant, Cell and Environment, 34 (12), 2038-2046. (doi:10.1111/j.1365-3040.2011.02401.x). (PMID:21777252)

Record type: Article

Abstract

Rice (Oryza sativa L.) secretes far smaller amounts of metal-complexing phytosiderophores (PS) than other grasses. But there is increasing evidence that it relies on PS secretion for its zinc (Zn) uptake. After nitrogen, Zn deficiency is the most common nutrient disorder in rice, affecting up to 50% of lowland rice soils globally. We developed a mathematical model of PS secretion from roots and resulting solubilization and uptake of Zn, allowing for root growth, diurnal variation in secretion, decomposition of the PS in the soil, and the transport and interaction of the PS and Zn in the soil. A sensitivity analysis showed that with realistic parameter values for rice in submerged soil, the typically observed rates of PS secretion from rice are sufficient and necessary to explain observed rates of Zn uptake. There is little effect of diurnal variation in secretion on cumulative Zn uptake, irrespective of other model parameter values, indicating that the observed diurnal variation is not causally related to Zn uptake efficiency. Rooting density has a large effect on uptake per unit PS secretion as a result of overlap of the zones of influence of neighbouring roots. The effects of other complications in the rice rhizosphere are discussed.

Full text not available from this repository.

More information

e-pub ahead of print date: 23 August 2011
Published date: December 2011
Keywords: cereal, micronutrient, mugineic acid, rhizosphere, solubilization
Organisations: Bioengineering Group

Identifiers

Local EPrints ID: 201905
URI: http://eprints.soton.ac.uk/id/eprint/201905
ISSN: 0140-7791
PURE UUID: 95eb024d-4bf2-44b3-b3e2-edf7d27165c4
ORCID for Tiina Roose: ORCID iD orcid.org/0000-0001-8710-1063

Catalogue record

Date deposited: 02 Nov 2011 17:32
Last modified: 10 Dec 2019 01:41

Export record

Altmetrics

Contributors

Author: Mariya Ptashnyk
Author: Tiina Roose ORCID iD
Author: Davey L. Jones
Author: Guy J.D. Kirk

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×