Journal Article

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

Makiko Kosugi, Maiko Arita, Ryoko Shizuma, Yufu Moriyama, Yasuhiro Kashino, Hiroyuki Koike and Kazuhiko Satoh

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 50, issue 4, pages 879-888
Published in print April 2009 | ISSN: 0032-0781
Published online March 2009 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcp043
Responses to Desiccation Stress in Lichens are Different from Those in Their Photobionts

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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

Journal Article.  5221 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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