TY  - JOUR
AU  - Moskvina, P. P.
AU  - Anokhina, G. B.
AU  - Eprintsev, A. T.
T1  - Subcellular Redistribution of Calcium Ions in Zea mays L. Leaves under Hypoxia
JO  - Journal of Stress Physiology & Biochemistry
Y1  - 2025/december
VL  - 21
IS  - 4
SP  - 233
EP  - 239
UR  - http://www.jspb.ru/issues/2025/N4/JSPB_2025_4_233-239.pdf
KW  - GABA shunt
KW  - hypoxic stress
KW  - calcium
KW  - Zea mays L.
U1  - 1997-0838
N2  - Previous studies on the functioning of the γ-aminobutyric acid (GABA) shunt under hypoxic conditions have demonstrated the activation of catalytic activity in enzymes that bypass two reactions of the citric acid cycle. However, the mechanism responsible for transmitting the signal of the onset of hypoxic stress into the cell remains unclear. It is known that calcium ions can act as messengers of intracellular signals. In this study, we analyzed changes in calcium ion content in maize leaves under hypoxia. It was found that under oxygen deficiency, the level of the target cation in the total cellular fraction increases 3,8-fold compared to the control. At 3 hours of incubation, the calcium content in the cytosolic fraction increases slightly, reaching its maximum value by 24 hours. In the mitochondrial fraction of the treated samples, a decrease in the concentration of free calcium was observed, reaching 2,2 times lower than the control. The rise in cytosolic Ca2+ levels, along with the rapid reestablishment of ionic homeostasis, is thought to act as a hypoxic stress signal. The obtained results will expand our knowledge of the mechanisms underlying the primary stress response in plant cells to oxygen deficiency in the environment, which may ultimately contribute to the development of more resilient agricultural crops.
ER  -