caa a22 4500 445889934 CHVBK 20180317145612.0 cr unu---uuuuu 170323e20111001xx s 000 0 eng 10.1007/s11120-011-9691-8 doi (NATIONALLICENCE)springer-10.1007/s11120-011-9691-8 Multiple dissipation components of excess light energy in dry lichen revealed by ultrafast fluorescence study at 5K [Elektronische Daten] [Hirohisa Miyake, Masayuki Komura, Shigeru Itoh, Makiko Kosugi, Yasuhiro Kashino, Kazuhiko Satoh, Yutaka Shibata] A time-resolved fluorescence study of living lichen thalli at 5K 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 5K 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 27ps in the far-red region that was absent in wet lichen thalli, and the other is recognized as accelerated fluorescence decay in the 685-700nm 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 5K, might have a supplementary role and take place either in the core antenna of PS II or aggregated peripheral antenna of PS II. Springer Science+Business Media B.V., 2011 Photosystem II nationallicence LHCII nationallicence Non-photochemical quenching nationallicence Parmotrema tinctorum nationallicence Miyake Hirohisa Division of Material Science (Physics), Graduate School of Science, Nagoya University, 464-8602, Nagoya, Japan aut Komura Masayuki Division of Material Science (Physics), Graduate School of Science, Nagoya University, 464-8602, Nagoya, Japan aut Itoh Shigeru Division of Material Science (Physics), Graduate School of Science, Nagoya University, 464-8602, Nagoya, Japan aut Kosugi Makiko Graduate School of Life Science, University of Hyogo, Harima Science Garden City, 678-1297, Hyogo, Japan aut Kashino Yasuhiro Graduate School of Life Science, University of Hyogo, Harima Science Garden City, 678-1297, Hyogo, Japan aut Satoh Kazuhiko Graduate School of Life Science, University of Hyogo, Harima Science Garden City, 678-1297, Hyogo, Japan aut Shibata Yutaka Division of Material Science (Physics), Graduate School of Science, Nagoya University, 464-8602, Nagoya, Japan aut Photosynthesis Research Springer Netherlands 110/1(2011-10-01), 39-48 0166-8595 110:1<39 2011 110 11120 https://doi.org/10.1007/s11120-011-9691-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11120-011-9691-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Miyake Hirohisa Division of Material Science (Physics), Graduate School of Science, Nagoya University, 464-8602, Nagoya, Japan aut NATIONALLICENCE 700 1- Komura Masayuki Division of Material Science (Physics), Graduate School of Science, Nagoya University, 464-8602, Nagoya, Japan aut NATIONALLICENCE 700 1- Itoh Shigeru Division of Material Science (Physics), Graduate School of Science, Nagoya University, 464-8602, Nagoya, Japan aut NATIONALLICENCE 700 1- Kosugi Makiko Graduate School of Life Science, University of Hyogo, Harima Science Garden City, 678-1297, Hyogo, Japan aut NATIONALLICENCE 700 1- Kashino Yasuhiro Graduate School of Life Science, University of Hyogo, Harima Science Garden City, 678-1297, Hyogo, Japan aut NATIONALLICENCE 700 1- Satoh Kazuhiko Graduate School of Life Science, University of Hyogo, Harima Science Garden City, 678-1297, Hyogo, Japan aut NATIONALLICENCE 700 1- Shibata Yutaka Division of Material Science (Physics), Graduate School of Science, Nagoya University, 464-8602, Nagoya, Japan aut NATIONALLICENCE 773 0- Photosynthesis Research Springer Netherlands 110/1(2011-10-01), 39-48 0166-8595 110:1<39 2011 110 11120 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer