The limits of salt tolerance of Nasturtium officinale R.Br. plants as applied to biological-technical life support system for the man (BTLSS), in which the plants were grown on model solutions imitating solutions with addition of mineralized exometabolite were investigated. The influence of NaCl in the concentrations range: 0.7, 1.4, 1.6, 1.8, 2.0, 2.1, 2.2 и 2.3 g×L-1 on dry aboveground biomass and accumulation of po- tassium and sodium in Nasturtium officinale R.Br. plants, grown on model solutions imitating solutions with addition of mineralized human exometabolite was investigated. Model solution in NaCl concentration equal to 0.02 g×L-1 was used as control. Watercress plants (Nasturtium officinale R.Br.) were grown using method of water culture with photosynthetically active radiation (PAR) intensity equal to 690 μmole×m-2×s-1. Photoperiod was 24 h. Dechlorinated tap water was daily added into the vessels with plants during 7 days as solution evapotranspiration, after this the solution was replaced with a fresh one. Nutrient solutions were contin- uously enriched with oxygen. The plants were estimated on aboveground dry biomass and the content of potassium and sodium in aboveground bodies. The plants were harvested in 19 days after planting on model solution. It was shown that Nasturtium officinale plants were able to maintain high K/Na ratio at investigated salinization levels, which was important parameter in salt tolerance of glycophyte plants. As a result of investigations carried out it was shown that maximum salini- zation level for watercress cultivation in closed ecosystem was 1.8 g×L-1 NaCl. It was established that сritical salinization for watercress provoking death of plants had occurred at NaCl concentration equal to 2.0 g×L-1.
watercress (Nasturtium officinale R.Br.), salt tolerance, closed ecosystems
1. Tihomirova N.A., Pavlova A.M., Ushakova S.A. [i dr.]. Produkcionnye harakteristiki zelennyh rasteniy pri vyraschivanii na zhidkih produktah pererabotki ekzometabolitov cheloveka primenitel'no k biologo-tehnicheskoy sisteme zhizneobespecheniya // Aviakosmicheskaya i ekologicheskaya medicina. - 2017. - № 1. - S. 51-57.
2. Tihomirova N.A., Ushakova S.A., Shklavcova E.S. [i dr.]. Vliyanie intensivnosti FAR i koncentracii NaCl na rost rasteniy Solerosa evropeyskogo primenitel'no k iskusstvennym ekologicheskim sistemam // Fiziologiya rasteniy. - 2016. - № 4. - S. 1- 10.
3. Poluektov N.S. Metody analiza po fotometrii plameni. - M.: Himiya, 1959. - 230 s.
4. Lakin G.F. Biometriya. - M.: Vyssh. shk., 1973. - 344 s.
5. Kasumov N.A. Fiziologo-biologicheskie aspekty mehanizma deystviya soley na rastitel'nyy organizm. - Baku: Elm, 1983. - 142 s.
6. Lebaudy A., Very A., Sentenac H. K+channel activity in plants: genes, regulations and functions // FEBSLetters. - 2007. - V. 581. - P. 2357-2366.
7. Veselova T.V., Veselovskiy V.A., Vlasenko V.V. [i dr.]. Variabel'nost' kak test perehoda kletki v sostoyanie stressa v usloviyah intoksikacii // Fiziologiya rasteniy. - 1990. - T. 37. - S. 733-738.
8. Hauser F., Horie T.A conserved primary salt tolerance mechanism mediated by HKT transporters: a mechanism for sodium exclusion and maintenance of high K+/Na+ ratio in leaves during salinity stress // Plant Cell Environment. - 2010. - V. 33. - R. 552-565.
9. Kaddour R., Draoui E., Baâtour O. [i dr.]. Assessment of salt tolerance of Nasturtium officinale R. Br. using physiological and biochemical parameters // Acta physi- ology plant. - 2013. - V. 35. - R. 3427-3436.
