THE ROLE OF AMINO ACIDS AND?SUGARS IN SUPPORTING OF OSMOTIC
HOMEOSTASIS IN?MAIZE?SEEDLING TISSUES AT?SALINIZATION CONDITIONS
AND TREATMENT WITH SYNTHETIC GROWTH REGULATORS
Kholodny Institute of Botany, National Academy of Sciences of Ukaine, Kyiv;
Stress state in plants caused by salinization conditions is characterized by the disturbance of ionic and osmotic homeostasis. The maintenance of the latter is reached by accumulation of osmolytes including free amino acids and soluble sugars in cells. The free amino acid level in the 8?day-old control seedling leaves was higher, than in the roots, whereas the contrary picture was observed in 17?day-old plant tissues. At the same time 8-day-old seedling roots contained more total sugars, than leaves, although the reduced sugar content was nearly a half of the total sugar content. A decrease of both total and reduced sugar levels was observed in 17-day-old seedling tissues.
One-day exposure of 7-day-old seedlings to 0.1 M NaCl increased the free amino acid content especially in roots, than in leaves, and the total sugar content in maize leaves, whereas in roots this level remained without changes. The prolongation of salt exposure to 10 days leads to osmolyte content decrease. The seed treatment with Methyure and Ivine intensified accumulation of free amino acids and soluble sugars in the root and leaf tissues under salinization conditions.
Key words: salinization, osmotic homeostasis, free amino acids, total and reduced sugars, synthetic regulators of growth, maize seedlings (Zea mays?L.).
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