Effects of Abiotic Stresses on the Content of Glycoglycerolipids in the Vacuolar Membrane of Red Beetroot
Glycoglycerolipids (GL) of the red beet vacuolar membrane under osmotic and oxidative stresses have been investigated. Variations of the GL content under stress conditions might be indicators of an important role of these compounds in protective mechanisms. Changes of the GL levels and the digalactosyldiacylglycerols/monogalactosyldiacylglycerol (DGDG/MGDG) ratio in the vacuolar membrane under hypoosmotic and oxidative stresses corresponded mainly to those observed in other cell membranes under majority of stresses studied, namely, the ratio increased that contributed to membrane stabilization. The changes of the GL content of vacuolar membrane caused by hyperosmotic stress notably differed. The DGDG content and DGDG/MGDG ratio significantly decreased. These alterations did not necessarily result in a decrease in the membrane stability under hyperosmotic stress, since the content of MGDG involved in the formation of a hexagonal structure and capable of destabilizing lipid bilayer also decreased. The changes of the GL level in the vacuolar membrane under hyperosmotic stress can be due to an increased degradation or reduced biosynthesis of GL; these changes may represent yet another defense mechanism of a plant cell against stresses.
Keywords:vacuolar membrane glycoglycerolipids abiotic stress
The work was performed on the equipment of the CSU “Bioanalytics” of the Siberian Institute of plant physiology and biochemistry SB RAS (Irkutsk).
COMPLIANCE WITH ETHICAL STANDARDS
The authors declare that they have no conflict of interest. This article does not contain any studies involving animals or human participants performed by any of the authors.
- 3.Rozentsvet O. A., Nesterov V. N., Sinyutina N. F. 2010. The changes in the composition of cell membrane lipids and subcellular fractions of the freshwater plant Hydrilla verticillata (L. f). Royle under the influence of heavy metals. Samarskaya Luka: Problemy regionalnoy i globalnoy ekologii (Rus.). 19 (1), 61–77.Google Scholar
- 5.Ozolina N.V., Gurina V.V., Nesterkina I.S., Dudareva L.V., Katyshev A.I., Nurminsky V.N. 2017. Fatty acid composition of total lipids of the vacuolar membrane under abiotic stress. Biol. membrany. (Rus.). 34 (1), 63–69.Google Scholar
- 6.Salyaev R.K., Kuzevanov V.Ya., Khaptagaev S.B., Kopytchuk V.N. 1981. Isolation and purification of vacuoles and vacuolar membranes from plant cells. Fiziologiya rasteniy (Rus.). 28, 1295–1305.Google Scholar