Publications by authors named "Julia Valitova"
Article Synopsis
- Earth’s rising temperatures due to human activities and solar changes threaten biodiversity, with lichens being particularly sensitive to these climate shifts.
- The study investigates how temperature variations affect lichens by focusing on ergosterol (ERG) and the enzyme involved in its production, squalene epoxidase, highlighting gaps in understanding its regulation during stress.
- Results show that extreme temperatures adversely impact lichen physiology, with significant changes in respiration and membrane integrity at +40 °C and -20 °C, leading to increased expression of certain genes related to sterols and heat stress proteins.
Sterols play important structural and regulatory roles in numerous intracellular processes. Unlike animals, plants contain a distinctive and diverse variety of sterols. Recently, information has emerged showing that stigmasterol is a "stress sterol".
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- Cold stress negatively impacts the major membrane lipids in plants, and this study focuses on the role of sterols in wheat's response to such stress.
- The research found that wheat roots are more sensitive to cold temperatures than leaves, showing damage to membrane integrity and increased oxidative stress markers in roots.
- Increased levels of sterols in roots during short-term cold exposure help protect against stress, while leaves maintain stability due to high sterol levels and up-regulation of related compounds, contributing to overall cold tolerance in wheat.
The dependence of membrane function on its sterol component has been intensively studied with model lipids and isolated animal membranes, but to a much lesser extent with plant membranes. Depleting membrane sterols could be predicted to have a strong effect on membrane activity and have harmful physiological consequences. In this study, we characterized membrane lipid composition, membrane permeability for ions, some physiological parameters, such as H2O2 accumulation, formation of autophagosomal vacuoles, and expression of peroxidase and autophagic genes, and cell viability in the roots of wheat (Triticum aestivum L.
View Article and Find Full Text PDFPlant sterols are important multifunctional lipids, which are involved in determining membrane properties. Biophysical characteristics of model lipid and isolated animal membranes with altered sterol component have been intensively studied. In plants however, the precise mechanisms of involvement of sterols in membrane functioning remain unclear.
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