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

Autor:	Maiko Arita, Yasuhiro Kashino, Kazuhiko Satoh, Makiko Kosugi, Hiroyuki Koike, Ryoko Shizuma, Yufu Moriyama
Rok vydání:	2009
Předmět:	Trebouxia Photoinhibition Lichens Light Physiology Photosystem II Protein Complex Plant physiology Cell Biology Plant Science General Medicine Biology Photosynthesis biology.organism_classification Fluorescence Desiccation tolerance Symbiosis Chlorophyta Botany Desiccation Lichen
Zdroj:	Plant and Cell Physiology. 50:879-888
ISSN:	1471-9053 0032-0781
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::28f5f90456eeb0a239e68fd82c13f65b https://doi.org/10.1093/pcp/pcp043 Zobrazit plný text záznamu Plný text ve formátu PDF