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231225s2003 xx |||||o 00| ||eng c |
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|a 10.1046/j.1469-8137.2003.00852.x
|2 doi
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|a eng
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| 100 |
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|a Kranner, Ilse
|e verfasserin
|4 aut
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|a Biochemical traits of lichens differing in relative desiccation tolerance
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|c 2003
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|a Date Revised 20.04.2021
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a • Oxidative stress arises when desiccation restricts photosynthesis and light energy is transferred from photo-excited pigments onto ground state oxygen. We tested whether a highly desiccation tolerant lichen, Pseudevernia furfuracea, displays better protection against oxidative stress than more sensitive species, Lobaria pulmonaria and Peltigera polydactyla. • We rehydrated lichens after desiccation periods of 2, 7 and 9 weeks and assessed their viability by measuring CO2 exchange using IRGA. During desiccation and rehydration, photosynthetic pigments and the antioxidant α-tocopherol were analysed by HPLC, and peroxidases by spectrophotometry. • Pseudevernia furfuracea contained considerably lower chlorophyll, α-tocopherol and β-carotene concentrations and peroxidase activity than the two other lichens. However, it recovered photosynthesis rapidly, even after remaining in the desiccated state for 2 months while there was a significant delay in the onset of photosynthesis in L. pulmonaria and P. polydactyla. • We conclude that high antioxidant concentrations do not necessarily indicate better adaptation to desiccation. Rather, the ability to rapidly re-establish the species-specific normal antioxidant concentrations during rehydration, even after longer desiccation times, is a characteristic of well-adapted species
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|a Journal Article
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|a Desiccation tolerance
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|a Lobaria pulmonaria
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|a Peltigera polydactyla
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|a Pseudevernia furfuracea
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|a peroxidase
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|a photosynthesis
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|a pigment
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|a tocopherol
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1 |
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|a Zorn, Margret
|e verfasserin
|4 aut
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1 |
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|a Turk, Boris
|e verfasserin
|4 aut
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1 |
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|a Wornik, Sabine
|e verfasserin
|4 aut
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|a Beckett, Richard P
|e verfasserin
|4 aut
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|a Batič, Franc
|e verfasserin
|4 aut
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|i Enthalten in
|t The New phytologist
|d 1979
|g 160(2003), 1 vom: 20. Okt., Seite 167-176
|w (DE-627)NLM09818248X
|x 1469-8137
|7 nnns
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|g volume:160
|g year:2003
|g number:1
|g day:20
|g month:10
|g pages:167-176
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