Abstract
The process of cell death in sugarcane suspension culture (Saccharum officinarum L.) after exposure to a subzero temperature of –8°С and features of the mitochondria functioning during this period were studied. It was revealed that the cause of cell death after the end of the stress factor action was the development of oxidative stress and damage to individual components of mitochondrial ETC: subunit II of cytochrome c oxidase and α- and β-subunits of ATP synthase. Under these conditions, the activity of the alternative pathway (AP) of respiration remained at the control level much longer and decreased more slowly than the activity of the cytochrome pathway. The collapse of respiration occurred 6 h after exposure to subzero temperature after the release of cytochrome c from mitochondria. At the same time, the contribution of AP to the respiration of whole cells and isolated mitochondria in the S. officinarum suspension culture increased to 70%. Thus, the functioning of AP contributed to the maintenance of respiratory metabolism in S. officinarum cells after stress treatment and contributed to the survival of almost 20% of cells in culture.
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We are grateful to an anonymous reviewer for valuable comments and advice.
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The work was carried out within the framework of the state task of the Siberian Institute of Plant Physiology and Biochemistry, Siberian Branch, Russian Academy of Sciences (registration no. 121031300009-4) using the collections of The Core Facilities Center “Bioresource Center” and equipment of The Core Facilities Center “Bioanalytics” at The Siberian Institute of Plant Physiology and Biochemistry, Siberian Branch, Russian Academy of Sciences.
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Lyubushkina, I.V., Stepanov, A.V., Fedyaeva, A.V. et al. Mitochondria and Cell Death in Suspension Culture of Saccharum officinarum L. under Subzero Temperature Treatment. Russ J Plant Physiol 69, 113 (2022). https://doi.org/10.1134/S1021443722060188
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DOI: https://doi.org/10.1134/S1021443722060188