Enhanced zinc uptake by rice through phytosiderophore secretion

a modelling study

Mariya Ptashnyk, Tiina Roose, Davey L. Jones, Guy J. D. Kirk (Lead / Corresponding author)

Research output: Contribution to journalArticle

28 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)2038-2046
Number of pages9
JournalPlant, Cell & Environment
Volume34
Issue number12
DOIs
Publication statusPublished - Dec 2011

Fingerprint

phytosiderophores
Zinc
zinc
secretion
uptake mechanisms
rice
Soil
diurnal variation
soil
Rhizosphere
rice soils
Poaceae
Oryza
solubilization
rooting
root growth
lowlands
rhizosphere
Oryza sativa
Theoretical Models

Keywords

  • Models, Biological
  • Oryza sativa
  • Plant roots
  • Siderophores
  • Soil
  • Zinc

Cite this

Ptashnyk, Mariya ; Roose, Tiina ; Jones, Davey L. ; Kirk, Guy J. D. / Enhanced zinc uptake by rice through phytosiderophore secretion : a modelling study. In: Plant, Cell & Environment. 2011 ; Vol. 34, No. 12. pp. 2038-2046.
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Enhanced zinc uptake by rice through phytosiderophore secretion : a modelling study. / Ptashnyk, Mariya; Roose, Tiina; Jones, Davey L.; Kirk, Guy J. D. (Lead / Corresponding author).

In: Plant, Cell & Environment, Vol. 34, No. 12, 12.2011, p. 2038-2046.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Enhanced zinc uptake by rice through phytosiderophore secretion

T2 - a modelling study

AU - Ptashnyk, Mariya

AU - Roose, Tiina

AU - Jones, Davey L.

AU - Kirk, Guy J. D.

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N2 - 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.

AB - 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.

KW - Models, Biological

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