Journal Article

Mechanisms to Avoid Photoinhibition in a Desiccation-Tolerant Cyanobacterium, <i>Nostoc commune</i>

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

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 49, issue 3, pages 488-492
Published in print March 2008 | ISSN: 0032-0781
Published online March 2008 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcn018
Mechanisms to Avoid Photoinhibition in a Desiccation-Tolerant Cyanobacterium, Nostoc commune

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A desiccation-tolerant cyanobacterium, Nostoc commune, shows unique responses to dehydration. These responses are: (i) loss of PSII activity in parallel with the loss of photosynthesis; (ii) loss of PSI activity; and (iii) dissipation of light energy absorbed by pigment–protein complexes. In this study, 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

Journal Article.  2803 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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