ANOTHER DISCUSSION OF MEMBRANE VOLTAGE ALTERATIONS
IN GROWING POLLEN TUBE
M.A. Breigina,1 A.V. Smirnova, N.P. Matveyeva, I.P. Yermakov
M.V. Lomonosov Moscow State University, School of Biology, Department of Plant Physiology, Moscow;
1 e-mail: pollen-ions@rambler.ru
Here we give a critical analysis of the opinion of Andreev (2011) on membrane potential distribution along
the pollen tube plasmalemma. He assumes that a lateral gradient of dipole potential exists, but suggests a lateral
gradient of transmembrane potential impossible. We demonstrate by concrete examples that the argumentation
of the initiator of discussion is based on inaccurate citation of our experimental data (Breygina et al., 2009) and
incomplete analysis of previously published articles. Speaking about transmembrane potential, he doesn’t consider
numerous facts demonstrating the uneven distribution of transmembrane ion fluxes and ion-transport proteins
in the pollen tube plasmalemma, as well as data obtained by modeling of transmembrane potential distribution
in objects of different shape. In addition, the assumption on the uneven distribution of dipole potential doesn’t
have an experimental basis neither in studies of the pollen tube, nor in the practice of using fluorescent voltage-
sensitive dyes DiBAC4(3) and Di-4-ANEPPS. We are expecting the author to obtain experimental data in support
of his position.
Key words: pollen tube, membrane potential
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