Does calcium-enhanced phosphorus toxicity explain the absence of most Proteaceae species from calcareous habitats?

Research output: ThesisDoctoral Thesis

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Abstract

The plant family Proteaceae represents an ecologically important component of the Australian flora, contributing towards south­ western Australia's exceptionally high biodiversity. Most Proteaceae are absent from young calcareous soils, higher in soil calcium (Ca) and phosphorus (P). This study shows that Ca-enhanced P toxicity can explain the exclusion of most Proteaceae from calcareous habitats. It is proposed that Ca enhances P toxicity in Proteaceae by increasing the preferential allocation of
P to specific photosynthetic mesophyll cells, reducing physiological zinc concentrations. This thesis presents the first model describing Ca-enhanced P toxicity and highlights its importance in the distribution of Proteaceae.
Original languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
  • The University of Western Australia
Supervisors/Advisors
  • Lambers, Hans, Supervisor
  • Clode, Peta, Supervisor
Thesis sponsors
Award date23 May 2018
DOIs
Publication statusUnpublished - 2018

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calcium
toxicity
phosphorus
habitat
calcareous soil
flora
zinc
biodiversity
soil

Cite this

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title = "Does calcium-enhanced phosphorus toxicity explain the absence of most Proteaceae species from calcareous habitats?",
abstract = "The plant family Proteaceae represents an ecologically important component of the Australian flora, contributing towards south­ western Australia's exceptionally high biodiversity. Most Proteaceae are absent from young calcareous soils, higher in soil calcium (Ca) and phosphorus (P). This study shows that Ca-enhanced P toxicity can explain the exclusion of most Proteaceae from calcareous habitats. It is proposed that Ca enhances P toxicity in Proteaceae by increasing the preferential allocation ofP to specific photosynthetic mesophyll cells, reducing physiological zinc concentrations. This thesis presents the first model describing Ca-enhanced P toxicity and highlights its importance in the distribution of Proteaceae.",
keywords = "Phosphorus, Calcium, Zinc, Proteaceae, X-ray microanalysis, Scanning electron microscopy, Cell-type-specific distribution, Calcium-enhanced phosphorus toxicity",
author = "Patrick Hayes",
year = "2018",
doi = "10.4225/23/5b308848dc0c2",
language = "English",
school = "The University of Western Australia",

}

TY - THES

T1 - Does calcium-enhanced phosphorus toxicity explain the absence of most Proteaceae species from calcareous habitats?

AU - Hayes, Patrick

PY - 2018

Y1 - 2018

N2 - The plant family Proteaceae represents an ecologically important component of the Australian flora, contributing towards south­ western Australia's exceptionally high biodiversity. Most Proteaceae are absent from young calcareous soils, higher in soil calcium (Ca) and phosphorus (P). This study shows that Ca-enhanced P toxicity can explain the exclusion of most Proteaceae from calcareous habitats. It is proposed that Ca enhances P toxicity in Proteaceae by increasing the preferential allocation ofP to specific photosynthetic mesophyll cells, reducing physiological zinc concentrations. This thesis presents the first model describing Ca-enhanced P toxicity and highlights its importance in the distribution of Proteaceae.

AB - The plant family Proteaceae represents an ecologically important component of the Australian flora, contributing towards south­ western Australia's exceptionally high biodiversity. Most Proteaceae are absent from young calcareous soils, higher in soil calcium (Ca) and phosphorus (P). This study shows that Ca-enhanced P toxicity can explain the exclusion of most Proteaceae from calcareous habitats. It is proposed that Ca enhances P toxicity in Proteaceae by increasing the preferential allocation ofP to specific photosynthetic mesophyll cells, reducing physiological zinc concentrations. This thesis presents the first model describing Ca-enhanced P toxicity and highlights its importance in the distribution of Proteaceae.

KW - Phosphorus

KW - Calcium

KW - Zinc

KW - Proteaceae

KW - X-ray microanalysis

KW - Scanning electron microscopy

KW - Cell-type-specific distribution

KW - Calcium-enhanced phosphorus toxicity

U2 - 10.4225/23/5b308848dc0c2

DO - 10.4225/23/5b308848dc0c2

M3 - Doctoral Thesis

ER -