PLASMALEMMAL ION TRANSPORT IN POLLEN TUBES IS REGULATED BY HYDROGEN PEROXIDE
N.M. Maksimov,1,* M.A. Breygina,1,2 I.P. Yermakov 1
1 Moscow State University, School of Biology, Moscow, 119991,
and 2 Pirogov Russian National Research Medical University, Moscow, 117997;
* e-mail: nmmaksimow@gmail.com
Pollen tube growth is a key step in the life cycle of seed plants, which defines the success of sexual reproduction. One of the most important contributions to this process is made
by ion transport through plasmalemma, which is tightly coordinated in time and space. Different classes of signaling molecules are involved in the re-gulation of transmembrane
ion transport including reactive oxygen species as it has been recently demonstrated. Here, using subprotoplasts isolated from pollen tubes, we have demonstrated a connection
between hydrogen peroxide, on one side, and two groups of targets on the plasma membrane, on the other side: nifedipine-sensitive Ca2+-permeable channels and
transport systems controlling membrane potential. H2O2 interaction with these targets causes the increase in cytoplasmic Ca2+ concentration
and plasmalemma hyperpolarization. One of the consequences of target modification was acceleration of cell wall regeneration.
Key words:
Ca2+ signalling, hydrogen peroxide (H2O2), membrane potential, polarized cell growth, pollen, protoplast, reactive oxygen species (ROS)
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