Calcium modulates leaf cell-specific phosphorus allocation in Proteaceae from south-western Australia.
Calcifuge
Jurien Bay chronosequence
Proteaceae
X-ray microanalysis
calcium
calcium-enhanced phosphorus toxicity
cell type-specific distribution
elemental analysis
phosphorus
scanning electron microscopy
Journal
Journal of experimental botany
ISSN: 1460-2431
Titre abrégé: J Exp Bot
Pays: England
ID NLM: 9882906
Informations de publication
Date de publication:
07 08 2019
07 08 2019
Historique:
received:
12
12
2018
accepted:
26
03
2019
pubmed:
3
5
2019
medline:
21
7
2020
entrez:
4
5
2019
Statut:
ppublish
Résumé
Over 650 Proteaceae occur in south-western Australia, contributing to the region's exceptionally high biodiversity. Most Proteaceae occur exclusively on severely nutrient-impoverished, acidic soils (calcifuge), whilst only few also occur on young, calcareous soils (soil-indifferent), higher in calcium (Ca) and phosphorus (P). The calcifuge habit of Proteaceae is explained by Ca-enhanced P toxicity, putatively linked to the leaf cell-specific allocation of Ca and P. Separation of these elements is essential to avoid the deleterious precipitation of Ca-phosphate. We used quantitative X-ray microanalysis to determine leaf cell-specific nutrient concentrations of two calcifuge and two soil-indifferent Proteaceae grown in hydroponics at a range of Ca and P concentrations. Calcium enhanced the preferential allocation of P to palisade mesophyll (PM) cells under high P conditions, without a significant change in whole leaf [P]. Calcifuges showed a greater PM [P] compared with soil-indifferent species, corresponding to their greater sensitivity. This study advances our mechanistic understanding of Ca-enhanced P toxicity, supporting the proposed model, and demonstrating its role in the calcifuge distribution of Proteaceae. This furthers our understanding of nutrient interactions at the cellular level and highlights its importance to plant functioning.
Identifiants
pubmed: 31049573
pii: 5432337
doi: 10.1093/jxb/erz156
pmc: PMC6685658
doi:
Substances chimiques
Phosphorus
27YLU75U4W
Calcium
SY7Q814VUP
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
3995-4009Informations de copyright
© The Author(s) 2019. Published by Oxford University Press on behalf of the Society for Experimental Biology.
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