Lichens assist the drought-induced fluorescence quenching of their photobiont green algae through arabitol

Makiko Kosugi; Akihisa Miyake; Yasuhiro Kasino; Yutaka Shibata; Kazuhiko Satoh; Shigeru Itoh

doi:10.1007/978-3-642-32034-7_109

Lichens assist the drought-induced fluorescence quenching of their photobiont green algae through arabitol

Makiko Kosugi, Akihisa Miyake, Yasuhiro Kasino, Yutaka Shibata, Kazuhiko Satoh, Shigeru Itoh

Research output: Chapter in Book/Report/Conference proceeding › Chapter

1 Citation (Scopus)

Abstract

In order to clarify the role of symbiotic association in drought tolerance of photosynthetic partners in lichens, responses to air-drying treatments in a green-algal lichen (Ramalina yasudae Rasänen) and its green algal photobiont (Trebouxia sp.) were studied. Responses to dehydration in the isolated Trebouxia sp. were different from those in the lichen. R. yasudae. Dehydration induced quenching of PS II fluorescence (d-NPQ) 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 the air-dried isolated Trebouxia sp. showed a higher sensitivity to photoinhibition than R. yasudae. We assayed the effects of various substances extracted from R. yasudae thalli on the fluorescence of Trebouxia sp. And we found the d-NPQ-type fluorescence quenching in the Trebouxia sp. was accelerated if they were dried with arabitol which was the main component of the water extract of R. yasudae. These results support the idea that arbitol triggered the photoprotection mechanism under drought conditions of the photobiont symbiotic with the mycobionts.

Original language	English
Title of host publication	Advanced Topics in Science and Technology in China
Publisher	Springer
Pages	514-517
Number of pages	4
DOIs	https://doi.org/10.1007/978-3-642-32034-7_109
Publication status	Published - 2013 Jan 1
Externally published	Yes

Publication series

Name	Advanced Topics in Science and Technology in China
ISSN (Print)	1995-6819
ISSN (Electronic)	1995-6827

Keywords

Drought tolerance
Lichens
Non-photochemical quenching
Photoinhibition
Symbiosis

ASJC Scopus subject areas

Chemical Engineering(all)
Engineering(all)
General

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Lichens assist the drought-induced fluorescence quenching of their photobiont green algae through arabitol. / Kosugi, Makiko; Miyake, Akihisa; Kasino, Yasuhiro; Shibata, Yutaka; Satoh, Kazuhiko; Itoh, Shigeru.

Advanced Topics in Science and Technology in China. Springer, 2013. p. 514-517 (Advanced Topics in Science and Technology in China).

Research output: Chapter in Book/Report/Conference proceeding › Chapter

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abstract = "In order to clarify the role of symbiotic association in drought tolerance of photosynthetic partners in lichens, responses to air-drying treatments in a green-algal lichen (Ramalina yasudae Ras{\"a}nen) and its green algal photobiont (Trebouxia sp.) were studied. Responses to dehydration in the isolated Trebouxia sp. were different from those in the lichen. R. yasudae. Dehydration induced quenching of PS II fluorescence (d-NPQ) 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 the air-dried isolated Trebouxia sp. showed a higher sensitivity to photoinhibition than R. yasudae. We assayed the effects of various substances extracted from R. yasudae thalli on the fluorescence of Trebouxia sp. And we found the d-NPQ-type fluorescence quenching in the Trebouxia sp. was accelerated if they were dried with arabitol which was the main component of the water extract of R. yasudae. These results support the idea that arbitol triggered the photoprotection mechanism under drought conditions of the photobiont symbiotic with the mycobionts.",

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