Document Detail


The paradox of higher light tolerance during desiccation in rare old forest cyanolichens than in more widespread co-occurring chloro- and cephalolichens.
MedLine Citation:
PMID:  22762452     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Desiccation tolerance was quantified in four cyanolichens (Lobaria hallii, Lobaria retigera, Lobaria scrobiculata, Pseudocyphellaria anomala), one cephalolichen (Lobaria pulmonaria) and one chlorolichen (Platismatia glauca) from xeric and mesic, open and closed North American boreal forests. These sympatric epiphytes were exposed to 0%, 33%, 55% and 75% relative humidity with or without medium light (200 μmol m⁻² s⁻¹) for 7 d. Permanent and temporary photoinhibitory damage was recorded as viability measures. All species tolerated well the drying in darkness, but L. hallii and L. retigera, associated with a very humid climate, showed minor damage at the hardest drying (silica gel). Simultaneous exposure to medium light severely aggravated the drying damage at all relative humidity levels. Combined drying-light exposure was particularly devastating for the widespread chloro- and cephalolichens, whereas cyanolichens, including rare old forest species, were fairly resistant. The ability to recover after combined drying-light stress (this study) correlated positively with increasing species-specific water holding capacities (from the literature). Cyanolichens, depending on liquid water and large internal water storage, probably require strong drying-light resistance to handle long periods between hydration events, whereas chlorolichens can regularly maintain their photosynthetic apparatus during frequent and rapid activation by humid air on clear mornings.
Authors:
Yngvar Gauslaa; Darwyn S Coxson; Knut Asbjørn Solhaug
Publication Detail:
Type:  Journal Article     Date:  2012-07-04
Journal Detail:
Title:  The New phytologist     Volume:  195     ISSN:  1469-8137     ISO Abbreviation:  New Phytol.     Publication Date:  2012 Sep 
Date Detail:
Created Date:  2012-08-06     Completed Date:  2012-12-04     Revised Date:  2013-07-12    
Medline Journal Info:
Nlm Unique ID:  9882884     Medline TA:  New Phytol     Country:  England    
Other Details:
Languages:  eng     Pagination:  812-22     Citation Subset:  IM    
Copyright Information:
© 2012 The Authors. New Phytologist © 2012 New Phytologist Trust.
Affiliation:
Department of Ecology and Natural Resource Management, Norwegian University of Life Sciences, PO Box 5003, NO-1432 Ås, Norway. yngvar.gauslaa@umb.no
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MeSH Terms
Descriptor/Qualifier:
Adaptation, Physiological / radiation effects*
Analysis of Variance
British Columbia
Climate
Desiccation*
Ecosystem
Kinetics
Lichens / physiology*,  radiation effects*
Light*
Photosystem II Protein Complex / metabolism
Plant Leaves / physiology,  radiation effects
Solutions
Trees / physiology*,  radiation effects*
Water / metabolism
Chemical
Reg. No./Substance:
0/Photosystem II Protein Complex; 0/Solutions; 7732-18-5/Water
Comments/Corrections

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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