Oxygen gulp in microwounded cells of Chara corallina detected by novel O2 nanosensorsстатьяТезисы
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Дата последнего поиска статьи во внешних источниках: 26 января 2018 г.
Аннотация:Molecular oxygen plays a crucial role in plant metabolism.
O2 is a source of reactive oxygen species (ROS) and oxidative
stress. The excessively generated ROS play both
signaling and protective function in mechanically stressed
plants. Generation of ROS in microwounded cells is presumably
mediated by the plasma membrane NADPH-oxidase
that transfers electrons from cytoplasmic NADPH to extracellular
oxygen with a concomitant production of ROS,
H2O2 in particular. Microscopic injuries associated with
ROS generation might be accompanied by oxygen concentration
changes in the apoplast. Recent invention and elaboration
of nanoscale electrochemical sensors provide the opportunity
to test this hypothesis. Our data obtained by applying
carbon-filled quartz micropipettes with platinum-coated tips
(oxygen nanosensors) showed a considerable drop in oxygen
concentration at Chara corallina cell surface in response to
microperforation of the cell wall (CW). We tested possible
involvement of the suppression of photosynthesis, the enhancement
of respiration, and the activation of the plasmamembrane
NADPH oxidase as an origin of oxygen decline
upon CW microwounding. The results provide evidence for
major role of plasmalemmal NADPH-oxidase in the discovered
local drop of O2 content.