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Combined electron-spin-resonance, X-ray-diffraction studies on phospholipid vesicles obtained from cold-hardened wheats: II. The role of free sterols by I. Horváth; L. Vigh; J. Woltjes; T. Farkas; P. van Hasselt; P. J. C. Kuiper is a Agricultural and Biological Sciences article available to read on EtoBox.

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The contents of free sterols and phospholipids in leaves of wheat, Triticum aestivum L., cultivars of different frost resistances, as well as the physical state of isolated phospholipids in the presence and absence of sterols, were compared before and after hardening. There was an inverse relationship between the sterol/phospholipid ratio and frost tolerance as a consequence of both a decrease in the free sterol, and an increase in the total phospholipid content. Sterol-sterol interactions were investigated using wide angle X-ray diffraction, while the phase behaviour of phospholipid vesicles was studied using the electron-spin-resonance (ESR) technique. No sterol-sterol interactions at -10 ~ C were detected in vesicles obtained from the hardened most cold-tolerant cultivar (Miranovskaja 808), containing sterols in a ratio (0.08) found in the original lipid extracts. In contrast, when the sterol-phospholipid ratio in the vesicles was set to the level (0.39) found in the extracts of the most sensitive cultivar, Penjamo 62, the appearance of sharp reflexion rings at 4.5"10 -1, 4.8"10 -1 and 5.0" 10-1 nm indicated strong sterol-sterol interactions. The temperatures for the onset of ph

Who reads Combined electron-spin-resonance, X-ray-diffraction studies on phospholipid vesicles obtained from cold-hardened wheats: II. The role of free sterols?

Author

I. Horváth; L. Vigh; J. Woltjes; T. Farkas; P. van Hasselt; P. J. C. Kuiper

Publisher

Springer-Verlag; Springer Verlag; Springer Science and Business Media LLC; Society for Mining, Metallurgy and Exploration Inc. (ISSN 0032-0935)

Published

1987

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)