Membranes and organelles of dehydratedSelaginella andTortula retain their normal configuration and structural integrity |
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Authors: | K A Platt M J Oliver W W Thomson |
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Institution: | (1) Department of Botany and Plant Sciences, University of California, 92521 Riverside, CA, USA;(2) U.S. Department of Agriculture, ARS, Southern Plains Area Crop Systematics Research Laboratory, Lubbock, Texas |
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Abstract: | Summary Dry (7–10% water content) leaves of the spikemossSelaginella lepidophylla (resurrection plant) and of the desiccationtolerant moss,Tortula ruralis were examined by freeze fracture electron microscopy. As has been described for dry seeds, the cells of these dehydrated leaves were shrunken, with highly convoluted walls and membranes. The membranes of all samples had a lipid bilayer organization with dispersed intramembranous particles (IMPs). Lipid droplets were very closely associated with the plasmamembrane. Chloroplasts were surrounded by a double membrane envelope and contained well-organized grana. Mitochondria were irregular in outline, and endoplasmic reticulum and cytoplasmic vesicles were present.Abbreviations ABA
abscisic acid
- EF
exoplasmic fracture
- FTIR
Fourier transform infrared analysis
- HII
hexagonal II
- IMPs
intramembranous particles
- MGDG
monogalactosyl diacylglycerol
- NMR
nuclear magnetic resonance
- PE
phosphatidylethanolamine
- PF
protoplasmic fracture
- PS I
photosystem I
- PS II
photosystem II |
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Keywords: | Desiccation tolerance Freeze fracture Membrane structure Selaginella Tortula |
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