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 proceedingChapter

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 languageEnglish
Title of host publicationAdvanced Topics in Science and Technology in China
PublisherSpringer
Pages514-517
Number of pages4
DOIs
Publication statusPublished - 2013 Jan 1
Externally publishedYes

Publication series

NameAdvanced 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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