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Plant and Cell Physiology Advance Access originally published online on March 20, 2009
Plant and Cell Physiology 2009 50(4):879-888; doi:10.1093/pcp/pcp043
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© The Author 2009. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

This article appears in the following Plant and Cell Physiology issue: Special Issue Articles: Photosynthesis [View the issue table of contents]

Responses to Desiccation Stress in Lichens are Different from Those in Their Photobionts

Makiko Kosugi1, Maiko Arita1, Ryoko Shizuma1, Yufu Moriyama1, Yasuhiro Kashino1, Hiroyuki Koike1,2 and Kazuhiko Satoh1,*

1Department of Life Science, School of Life Science, University of Hyogo, Harima Science Garden City, Hyogo, 678-1297 Japan

*Corresponding author: E-mail, satohkaz{at}sci.u-hyogo.ac.jp; Fax, +81-791-58-0549.


  Abstract

In order to clarify the role of symbiotic association in desiccation tolerance of photosynthetic partners in lichens, responses to air-drying and hypertonic treatments in a green-algal lichen (a chlorolichen, Ramalina yasudae Räsänen) and its green algal photobiont (freshly released and cultured Trebouxia sp.) were studied. Responses to dehydration in the isolated Trebouxia sp. were different from those in the lichen, R. yasudae, i.e. (i) the PSII reaction was totally inhibited in R. yasudae when photosynthesis was completely inhibited by desiccation, but it remained partially active in isolated Trebouxia sp; (ii) dehydration-induced quenching of PSII fluorescence was less in the isolated Trebouxia sp. compared with that in R. yasudae, suggesting that a substance(s) or a mechanism(s) to dissipate absorbed light energy to heat was lost by the isolation of the photobiont; and (iii) the air-dried isolated Trebouxia sp. showed a higher sensitivity to photoinhibition than R. yasudae. These results support the idea that association of the photobionts with the mycobionts increases tolerance to photoinhibition under drying conditions.

Keywords: Desiccation tolerance - Hypertonic treatment - Lichen - Photoinhibition - Symbiosis

Abbreviations: DTT, dithiothreitol; Fo and Fm, minimum and maximum level, respectively, of Chl fluorescence in the dark-adapted samples; FFormula and F, maximum and steady-state level, respectively, of Chl fluorescence in samples illuminated with actinic light; Fv, variable Chl fluorescence (Fv = Fm – Fo); NPQ, non-photochemical quenching; P700, a reaction center Chl dimer of PSI.

2Present address: Department of Biological Sciences, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo, 112-8551 Japan.

(Received January 20, 2009; Accepted March 3, 2009)
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