Three Different Mechanisms of Energy Dissipation of a Desiccation-tolerant Moss Serve One Common Purpose: to Protect Reaction Centres Against Photo-oxidation

Overview

Journal J Exp Bot

Publisher Oxford University Press

Specialty Biology

Date 2012 Mar 23

PMID 22438303

Citations 13

Authors

Hisanori Yamakawa

Yoshimasa Fukushima

Shigeru Itoh

Ulrich Heber

Affiliations

Soon will be listed here.

Abstract

Three different types of non-photochemical de-excitation of absorbed light energy protect photosystem II of the sun- and desiccation-tolerant moss Rhytidium rugosum against photo-oxidation. The first mechanism, which is light-induced in hydrated thalli, is sensitive to inhibition by dithiothreitol. It is controlled by the protonation of a thylakoid protein. Other mechanisms are activated by desiccation. One of them permits exciton migration towards a far-red band in the antenna pigments where fast thermal deactivation takes place. This mechanism appears to be similar to a mechanism detected before in desiccated lichens. A third mechanism is based on the reversible photo-accumulation of a radical that acts as a quencher of excitation energy in reaction centres of photosystem II. On the basis of absorption changes around 800 nm, the quencher is suggested to be an oxidized chlorophyll. The data show that desiccated moss is better protected against photo-oxidative damage than hydrated moss. Slow drying of moss thalli in the light increases photo-protection more than slow drying in darkness.

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