M. V. Rudnytska, T. A. Palladina

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

Ca²⁺-ATPases regulate the functioning of Ca²⁺-dependent signaling pathway SOS which provides removal of Na⁺ from the cytoplasm of cells via Na⁺/H⁺-antiporters in saline conditions. The influence of synthetic preparations Methyure and Ivine on the Ca²⁺-ATPase activity was investigated. It was shown that exposition of corn seedlings in the presence of 0.1 M NaCl rather enhanced hydrolytic than transport activity of Ca²⁺-ATPases in plasma and vacuolar membrane of root cells. It was found that seed treatment with such preparations, especially Methyure, caused intensification of the both activities of Ca²⁺-ATPases, mainly in vacuolar membrane. The results indicate than salt protective activity of preparations, especially Methyure, is associated with increased Ca²⁺-ATPase activity, which regulates the functioning of Na⁺/H⁺-antiporters.