University Of Tasmania

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Cross-talk between reactive oxygen species and polyamines in regulation of ion transport across the plasma membrane: implications for plant adaptive responses

journal contribution
posted on 2023-05-18, 01:58 authored by Igor Pottosin, Velarde-Buendia, AM, Bose, J, Zepeda-Jazo, I, Sergey ShabalaSergey Shabala, Dobrovinskaya, O
Many stresses are associated with increased accumulation of reactive oxygen species (ROS) and polyamines (PAs). PAs act as ROS scavengers, but export of putrescine and/or PAs to the apoplast and their catabolization by amine oxidases gives rise to H2O2 and other ROS, including hydroxyl radicals (OH). PA catabolization-based signalling in apoplast is implemented in plant development and programmed cell death and in plant responses to a variety of biotic and abiotic stresses. Central to ROS signalling is the induction of Ca2+ influx across the plasma membrane. Different ion conductances may be activated, depending on ROS, plant species, and tissue. Both H2O2 and OH can activate hyperpolarization-activated Ca2+-permeable channels. OH is also able to activate both outward K+ current and weakly voltage-dependent conductance (ROSIC), with a variable cation-to-anion selectivity and sensitive to a variety of cation and anion channel blockers. Unexpectedly, PAs potentiated OH-induced K+ efflux in vivo, as well as ROSIC in isolated protoplasts. This synergistic effect is restricted to the mature root zone and is more pronounced in salt-sensitive cultivars compared with salt-tolerant ones. ROS and PAs suppress the activity of some constitutively expressed K+ and non-selective cation channels. In addition, both OH and PAs activate plasma membrane Ca2+-ATPase and affect H+ pumping. Overall, OH and PAs may provoke a substantial remodelling of cation and anion conductance at the plasma membrane and affect Ca2+ signalling.


Publication title

Journal of Experimental Botany










Tasmanian Institute of Agriculture (TIA)


Oxford Univ Press

Place of publication

Great Clarendon St, Oxford, England, Ox2 6Dp

Rights statement

Copyright 2014 The Author

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the biological sciences