Osmotic stress-induced phosphoinositide and inositol phosphate signalling in plants.
Polyphosphoinositides (PPIs) became famous for their role in inositol-1,4,5-trisphosphate (InsP3) mediated-Ca(2+) signalling in mammalian cells, generated through signal-activated phospholipase C (PLC) hydrolysis of the minor membrane lipid, phosphatidylinositol-4,5-bisphosphate. For many years, the plant field followed the same paradigm, however, slowly a completely different picture is emerging. Moreover, various novel PPI-signalling compounds have been identified meanwhile, with new functions and targets coming to light. These include lipids phosphorylated at the D3-position of inositol but also water-soluble inositolpolyphosphates (IPPs). For several of them, a relationship to water stress has been reported. This review summarizes the current status of PPIs and IPPs in plants and discusses their potential in osmotic stress signalling and drought.
Munnik
Teun
T
Swammerdam Institute for Life Sciences, University of Amsterdam, the Netherlands. t.munnik@uva.nl <t.munnik@uva.nl>
Vermeer
Joop E M
JE
D055864:Droughts; D007295:Inositol Phosphates / Q000378:metabolism*; D009995:Osmosis; D018129:Phosphatidylinositol Phosphates / Q000378:metabolism*; D010944:Plants / Q000378:metabolism*; D015398:Signal Transduction; D013312:Stress, Physiological; D014867:Water / Q000378:metabolism
D007295:Inositol Phosphates; D018129:Phosphatidylinositol Phosphates; D014867:Water