Biochemical responses of the desiccation-tolerant resurrection fern Pleopeltis polypodioides to dehydration and rehydration

The epiphytic fern Pleopeltis polypodioides can tolerate repeated drying and rehydration events without conspicuous damage. To understand the biochemical principles of drought-tolerance, we analyzed the effect of dehydration and rehydration at 25 °C on hydroperoxide and lipid hydroperoxide, the acti...

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Bibliographic Details
Published in:Journal of plant physiology 2018-09, Vol.228, p.12-18
Main Authors: John, Susan P., Hasenstein, Karl H.
Format: Article
Language:English
Subjects:
Antioxidative enzymes
Biosynthesis
Catalase
Damage tolerance
Dehydration
Desiccation
Drought
Drought stress
Drying
Enzymes
Fatty acid composition
Fatty acids
Ferns
Flowers & plants
Glutathione
Hydroperoxide
Lipid hydroperoxide
Lipids
Oxidation resistance
Oxidative stress
Peroxide
Peroxides
Pleopeltis polypodioides
Rehydration
Stearic acid
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Summary:The epiphytic fern Pleopeltis polypodioides can tolerate repeated drying and rehydration events without conspicuous damage. To understand the biochemical principles of drought-tolerance, we analyzed the effect of dehydration and rehydration at 25 °C on hydroperoxide and lipid hydroperoxide, the activities of antioxidative (catalase and glutathione-oxidizing) enzymes and evaluated changes in fatty acid composition and saturation levels. Dehydration increased peroxide concentration and the activity of glutathione oxidases, but reduced catalase activity. During dehydration, the biosynthesis of palmitic (C16:0), linoleic (C18:2), linolenic (C18:3) and stearic acid (C18:0) increased 18, 12, 20, and 8-fold, respectively. In contrast, rehydration lowered levels of peroxides, the activity of glutathione-oxidizing enzymes, and fatty acids but increased catalase activity. The coordinated changes during de- and rehydration suggest that lipids and oxidative and antioxidative enzymes are components of the drought-resistance system.
ISSN:0176-1617
1618-1328
DOI:10.1016/j.jplph.2018.05.006