Format

Send to

Choose Destination
Plant Sci. 2019 Sep;286:57-67. doi: 10.1016/j.plantsci.2019.05.018. Epub 2019 May 30.

Intracellular phosphate homeostasis - A short way from metabolism to signaling.

Author information

1
Botanical Institute, Cologne Biocenter, University of Cologne, 50674 Cologne, Germany.
2
Botanical Institute, Cologne Biocenter, University of Cologne, 50674 Cologne, Germany; Cluster of Excellence on Plant Sciences (CEPLAS), University of Cologne, 50674 Cologne, Germany.
3
Botanical Institute, Cologne Biocenter, University of Cologne, 50674 Cologne, Germany. Electronic address: rainer.haeusler@uni-koeln.de.

Abstract

Phosphorus in plant cells occurs in inorganic form as both ortho- and pyrophosphate or bound to organic compounds, like e.g., nucleotides, phosphorylated metabolites, phospholipids, phosphorylated proteins, or phytate as P storage in the vacuoles of seeds. Individual compartments of the cell are surrounded by membranes that are selective barriers to avoid uncontrolled solute exchange. A controlled exchange of phosphate or phosphorylated metabolites is accomplished by specific phosphate transporters (PHTs) and the plastidial phosphate translocator family (PTs) of the inner envelope membrane. Plastids, in particular chloroplasts, are the site of various anabolic sequences of enzyme-catalyzed reactions. Apart from their role in metabolism PHTs and PTs are presumed to be also involved in communication between organelles and plant organs. Here we will focus on the integration of phosphate transport and homeostasis in signaling processes. Recent developments in this field will be critically assessed and potential future developments discussed. In particular, the occurrence of various plastid types in one organ (i.e. the leaf) with different functions with respect to metabolism or sensing, as has been documented recently following a tissue-specific proteomics approach (Beltran et al., 2018), will shed new light on functional aspects of phosphate homeostasis.

KEYWORDS:

Chloroplasts; Metabolism; Phosphate homeostasis; Phosphate translocators; Phosphate transporters; Plastids; Signaling

PMID:
31300142
DOI:
10.1016/j.plantsci.2019.05.018
[Indexed for MEDLINE]
Free full text

Supplemental Content

Full text links

Icon for Elsevier Science
Loading ...
Support Center