[No authors listed]
Biological membranes allow the regulation of numerous cellular processes, which are affected when unfavorable environmental factors are perceived. Lipids and proteins are the principal components of biological membranes. Each lipid has unique biophysical properties, and, therefore the lipid composition of the membrane is critical to maintaining the bilayer structure and functionality. Membrane composition and integrity are becoming the focus of studies aiming to understand how plants adapt to its environment. In this study, using a combination of di-4-ANEPPDHQ fluorescence and spectral phasor analysis, we report that the drought hypersensitive/squalene epoxidase (dry2/sqe1-5) mutant with reduced major sterols such as sitosterol and stigmasterol in roots presented higher membrane fluidity than the wild type. Moreover, analysis of endomembrane dynamics showed that vesicle formation was affected in dry2/sqe1-5. Further analysis of proteins associated with sterol rich micro domains showed that dry2/sqe1-5 presented micro domains function altered.
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