Cross-talk between reactive oxygen species and polyamines in regulation of ion transport across the plasma membrane: implications for plant adaptive responses.
J Exp Bot
; 65(5): 1271-83, 2014 Mar.
Article
en En
| MEDLINE
| ID: mdl-24465010
ABSTRACT
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 ((â¢)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 Ca(2+) influx across the plasma membrane. Different ion conductances may be activated, depending on ROS, plant species, and tissue. Both H2O2 and (â¢)OH can activate hyperpolarization-activated Ca(2+)-permeable channels. (â¢)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 (â¢)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 (â¢)OH and PAs activate plasma membrane Ca(2+)-ATPase and affect H(+) pumping. Overall, (â¢)OH and PAs may provoke a substantial remodelling of cation and anion conductance at the plasma membrane and affect Ca(2+) signalling.
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MEDLINE
Asunto principal:
Poliaminas
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Membrana Celular
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Especies Reactivas de Oxígeno
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Fenómenos Fisiológicos de las Plantas
Idioma:
En
Año:
2014
Tipo del documento:
Article