N. O. Kovalenko, T. A. Palladina

Kholodny Institute of Botany, National Academy of Sciences of Ukraine, Kyiv;
e-mail: tatiana_palladina@ukr.net

Four isoforms of H⁺-ATPase of plasma membrane: MHA1, MHA2, MHA3, MHA4 are expressed in the corn seedling roots with prevalence of genes MHA3 і MHA4. The exposure of seedlings in the presence of 0.1 M NaCl activated the expression of MHA4 gene isoform, that demonstrates its important role in the processes of adaptation to salinization conditions. In vacuolar membrane, where potential is created by two Н⁺-pumps, sodium ions activated gene expression of only Н⁺-АТРase of V-type, taking no effect on the expression of Н⁺-pyrophosphatase. The seeds pretreatment by synthetic preparations Methyure and Ivine did not affect gene expression of Н⁺-pumps. Thus we can suppose that the ability of the above preparations to activate functioning of Н⁺-pumps in the presence of sodium ions is realized at the post-tranlation level.