Multiple dissipation components of excess light energy in dry lichen revealed by ultrafast fluorescence study at 5 K

Hirohisa Miyake, Masayuki Komura, Shigeru Itoh, Makiko Kosugi, Yasuhiro Kashino, Kazuhiko Satoh, Yutaka Shibata

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

A time-resolved fluorescence study of living lichen thalli at 5 K was conducted to clarify the dynamics and mechanism of the effective dissipation of excess light energy taking place in lichen under extreme drought conditions. The decay-associated spectra obtained from the experiment at 5 K were characterized by a drastically sharpened spectral band which could not be resolved by experiments at higher temperatures. The present results indicated the existence of two distinct dissipation components of excess light energy in desiccated lichen; one is characterized as rapid fluorescence decay with a time constant of 27 ps in the far-red region that was absent in wet lichen thalli, and the other is recognized as accelerated fluorescence decay in the 685-700 nm spectral region. The former energy-dissipation component with extremely high quenching efficiency is most probably ascribed to the emergence of a rapid quenching state in the peripheral-antenna system of photosystem II (PS II) on desiccation. This is an extremely effective protection mechanism of PS II under desiccation, which lichens have developed to survive in the severely desiccated environments. The latter, which is less efficient at 5 K, might have a supplementary role and take place either in the core antenna of PS II or aggregated peripheral antenna of PS II.

Original languageEnglish
Pages (from-to)39-48
Number of pages10
JournalPhotosynthesis Research
Volume110
Issue number1
DOIs
Publication statusPublished - 2011 Oct 10

Keywords

  • LHCII
  • Non-photochemical quenching
  • Parmotrema tinctorum
  • Photosystem II

ASJC Scopus subject areas

  • Biochemistry
  • Plant Science
  • Cell Biology

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