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References (8)
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D. Smith (1960)
Studies in the Physiology of Lichens: With one Figure in the Text Absorption and Utilization of Some Simple Organic Nitrogen Compounds by Peltigera polydactylaAnnals of Botany, 24
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J. Farrar, D. Smith (1976)
ECOLOGICAL PHYSIOLOGY OF THE LICHEN HYPOGYMNIA PHYSODESNew Phytologist, 77
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J. Farrar (1976)
ECOLOGICAL PHYSIOLOGY OF THE LICHEN HYPOGYMNIA PHYSODES. I. SOME EFFECTS OF CONSTANT WATER SATURATIONNew Phytologist, 77
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O. Lange (1970)
Experimentell-ökologische Untersuchungen an Flechten der Negev-WüsteFlora oder Allgemeine botanische Zeitung. Abt. B, Morphologie und Geobotanik, 158
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D. Smith (1960)
Studies in the Physiology of Lichens: With two Figures in the Text The Effects of Starvation and of Ammonia Absorption upon the Nitrogen Content of Peltigera polydactylaAnnals of Botany, 24
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D. Smith (1960)
Studies in the physiology of lichens. 2. Absorption and utilization of some simple organic nitrogen compounds by Peltigera polydactyla. 3. Experiments with dissected disks of Peltigera polydactyla.Annals of Botany, 24
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D. Smith, S. Molesworth (1973)
LICHEN PHYSIOLOGY XIII. EFFECTS OF REWETTING DRY LICHENSNew Phytologist, 72
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G. Harris (1971)
The Ecology of Corticolous Lichens: II. The Relationship Between Physiology and the EnvironmentJournal of Ecology, 59
- Publisher
- Wiley
- Copyright
- Copyright © 1976 Wiley Subscription Services
- ISSN
- 0028-646X
- eISSN
- 1469-8137
- DOI
- 10.1111/j.1469-8137.1976.tb01504.x
- Publisher site
- See Article on Publisher Site
Abstract
The effects of ‘severe’ and ‘mild’ cycles of wetting and drying on Hypogymnia physodes were investigated. Each 24‐h cycle of the ‘severe’regime consisted of 3 h soaking in buffer followed by 21 h in air (becoming air‐dry in 1‐2 h), all at 20°C in light or dark. After seven ‘severe’cycles in the light, polyol levels remained high; mannitol, arabitol and ribitol were continually turned over, since there was a heavy loss of previously fixed 14C from each. In the dark, there was some decline in polyol levels after 7 days, presumably because the polyol pool could not be replenished by photosynthesis. During ‘severe’regimes, the carbon loss from the polyol pool was much greater than could be explained by respiration. Nevertheless, if maintenance of high rates of photosynthesis and large pools of polyols are taken as criteria of healthy thalli, then ‘severe’ cycles of wetting and drying are less deleterious than constant saturation.
Journal
New Phytologist – Wiley
Published: Jan 1, 1976