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The extracellular concentration of protons is much higher than intracellular its level. Responsi- ble for generation and maintaining this difference is the proton pump (H+) present in the outer cell membrane. A proton pump uses ATP as a substrate and expels H+ from the cell; consequently, the ions are asymmetrically located and the electrochemical gradient appears, which is used in many physiological processes such as cellular growth, osmoregulation and transport of substances into the cell. During the last 15 years much attention was drawn to the issues related to post-translational regulation of H+ATPases by different exogenic and endogenic stimuli of chemical nature (hormones, NaCl) and physical nature (tempe- rature, mechanical damage). A dynamic development of research in the field of molecular biology allowed to learn much more about their genetics. H+ATPase is encoded by a complex family of genes classified into 5 subfamilies, two of which (I and II) are widely expressed in many organs and tissues, whereas remaining three only in specified conditions such as some stages of plant development. Taking into account a key role of proton pumps in maintaining many physiological processes in the cell, their precise regulation at the transcriptional and post-translation levels is indispensable; however, the mechanisms of such regula- tion are not fully known. This article is an attempt to synthesise the knowledge regarding both levels of control as well as functions of plasmalemma proton pumps in plant cells physiology.

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The Editorial Board
Andrzej Łukaszyk - przewodniczący, Zofia Bielańska-Osuchowska, Szczepan Biliński, Mieczysław Chorąży, Aleksander Koj, Włodzimierz Korochoda, Leszek Kuźnicki, Aleksandra Stojałowska, Lech Wojtczak

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Katedra i Zakład Histologii i Embriologii Uniwersytetu Medycznego w Poznaniu, ul. Święcickiego 6, 60-781 Poznań, tel. +48 61 8546453, fax. +48 61 8546440, email:

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