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. 1992 Sep;100(1):246–254. doi: 10.1104/pp.100.1.246

Lateral and Rotational Mobilities of Lipids in Specific Cellular Membranes of Eucalyptus gunnii Cultivars Exhibiting Different Freezing Tolerance 1

Nathalie Leborgne 1,2,3, Laurence Dupou-Cézanne 1,2,3, Chantal Teulières 1,2,3, Hervé Canut 1,2,3, Jean-François Tocanne 1,2,3, Alain M Boudet 1,2,3
PMCID: PMC1075545  PMID: 16652954

Abstract

Two cell lines of Eucalyptus gunnii have been shown to keep their differential frost tolerance at the cellular level after long-term culture. They have been used to investigate the fluidity of specific cell membranes in relation with frost tolerance. Protoplasts and isolated vacuoles were obtained from both cell lines. In addition, purified plasma membrane and tonoplast (the vacuolar membrane) were separated from a crude microsomal fraction through free-flow electrophoresis. The lateral and rotational mobilities of lipids in these different membranes were studied by two biophysical techniques: fluorescence recovery after photobleaching (FRAP) and fluorescence polarization. After labeling the vacuoles isolated from the frost-sensitive cells with 1-oleoyl-2-(7-nitro-2,1,3-benz-oxadiazol-4-yl)aminocaproyl phosphatidylcholine, a single mobile component was observed with a diffusion coefficient of 2.4 × 10−9 cm2 s−1 and a mobile fraction close to 100% at a temperature of 23°C. When using isolated vacuoles from the frost tolerant line, a higher lateral diffusion of tonoplast lipids was found with a diffusion coefficient of 3.2 × 10−9 cm2 s−1, still with a mobile fraction close to 100%. No convincing data were obtained when performing fluorescence recovery after photobleaching experiments on protoplasts. Fluorescence polarization experiments confirmed the differential behavior of the two cell lines for tonoplast and also for plasma membrane. In addition, they showed that intrinsically tonoplast exhibited a higher fluidity than plasma membrane. Our results provide the first information on the fluidity of tonoplast and on the compared properties of two important plant membranes—tonoplast and plasma membrane—through the use of two complementary biophysical approaches. In addition, they suggest there is a correlation between membrane fluidity and cold tolerance. The potential interest of plant vacuole as a natural model system in membrane studies is emphasized.

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Selected References

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