Regulation of ion transport across the pollen tube plasmalemma by hydrogen peroxideстатья
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Дата последнего поиска статьи во внешних источниках: 7 сентября 2016 г.
Аннотация:The polar growth of the pollen tube is a key stage in the life cycle of seed plants, which is critical for successful sexual reproduction. One of the most important components of this process is ion transport across the cell membrane coordinated in time and space. Different classes of signal molecules, including reactive oxygen species, as has been found recently, participate in regulation of ion transmembrane transport. In this study, based on the model system of subprotoplasts isolated from pollen tubes, we showed that hydro? gen peroxide can regulate two targets located on the plasma membrane: nifedipine?sensitive Ca2+ channels and ion transport, both of which control the membrane potential. The interaction of hydrogen peroxide with these targets resulted in an increase in an intracellular Ca2+ concentration and hyperpolarization of the plasma membrane. Faster regeneration of the cell wall was a consequence of elevation of the Ca2+ intracellu? lar concentration.