Front Plant Sci. 2014 Apr 23;5:154. doi: 10.3389/fpls.2014.00154. eCollection 2014.
Polyamines control of cation transport across plant membranes: implications for ion homeostasis and abiotic stress signaling.
Frontiers in plant science
Igor Pottosin, Sergey Shabala
Affiliations
Affiliations
- Biomedical Centre, Centro Universitario de Investigaciones Biomédicas, University of Colima Colima, Mexico ; School of Land and Food, University of Tasmania Hobart, TAS, Australia.
- School of Land and Food, University of Tasmania Hobart, TAS, Australia.
PMID: 24795739
PMCID: PMC4006063 DOI: 10.3389/fpls.2014.00154
Abstract
Polyamines are unique polycationic metabolites, controlling a variety of vital functions in plants, including growth and stress responses. Over the last two decades a bulk of data was accumulated providing explicit evidence that polyamines play an essential role in regulating plant membrane transport. The most straightforward example is a blockage of the two major vacuolar cation channels, namely slow (SV) and fast (FV) activating ones, by the micromolar concentrations of polyamines. This effect is direct and fully reversible, with a potency descending in a sequence Spm(4+) > Spd(3+) > Put(2+). On the contrary, effects of polyamines on the plasma membrane (PM) cation and K(+)-selective channels are hardly dependent on polyamine species, display a relatively low affinity, and are likely to be indirect. Polyamines also affect vacuolar and PM H(+) pumps and Ca(2+) pump of the PM. On the other hand, catabolization of polyamines generates H2O2 and other reactive oxygen species (ROS), including hydroxyl radicals. Export of polyamines to the apoplast and their oxidation there by available amine oxidases results in the induction of a novel ion conductance and confers Ca(2+) influx across the PM. This mechanism, initially established for plant responses to pathogen attack (including a hypersensitive response), has been recently shown to mediate plant responses to a variety of abiotic stresses. In this review we summarize the effects of polyamines and their catabolites on cation transport in plants and discuss the implications of these effects for ion homeostasis, signaling, and plant adaptive responses to environment.
Keywords: cytosolic calcium; ion channels; ion pumps; plasma membrane; polyamines; reactive oxygen species; stress; vacuole
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