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Plant and Cell Physiology Advance Access published online on February 5, 2008
Plant and Cell Physiology, doi:10.1093/pcp/pcn018
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© The Author 2008. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

Mechanisms to avoid photoinhibition in a desiccation-tolerant cyanobacterium, Nostoc commune

Shin-ya Fukuda, Ruriko Yamakawa, Manabu Hirai, Yasuhiro Kashino, Hiroyuki Koike and Kazuhiko Satoh

Department of Life Science, Graduate School of Life Science, University of Hyogo, 3-2-1 Kouto, Kamigori-cho, Ako-gun, Hyogo, 678-1297, Japan

Corresponding author: Shin-ya Fukuda, Department of Life Science, Graduate School of Life Science, University of Hyogo, 3-2-1 Kouto, Kamigori-cho, Ako-gun, Hyogo, 678-1297, Japan, Tel; 0791-58-0184, Fax; 0791-58-0549, E-mail; s710624jp{at}yahoo.co.jp


  Abstract

A desiccation-tolerant cyanobacterium, Nostoc commune, shows unique responses to dehydration. These responses are: 1) loss of photosystem II (PSII) activity in parallel with the loss of photosynthesis, 2) loss of photosystem I (PSI) activity, and 3) dissipation of light energy absorbed by pigment–protein complexes (Hirai et al. Plant Cell Physiol. 45: 872 (2004)). In this paper, the deactivation of PSII is shown to be important in avoiding photoinhibition when the Calvin-Benson cycle is repressed by dehydration. Furthermore, our evidence suggests that dissipation of light energy absorbed by PSII blocks photoinhibition under strong light in dehydrated states.

Keywords: Cyanobacteria - Desiccation-induced non-photochemical quenching - Desiccation tolerance - Hypertonic treatment - Nostoc commune - Photoinhibition

(Received December 3, 2007; Accepted January 26, 2008)
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