Journal Article

Recovery of Photosynthetic Systems during Rewetting is Quite Rapid in a Terrestrial Cyanobacterium, <i>Nostoc commune</i>

Kazuhiko Satoh, Manabu Hirai, Junko Nishio, Takaharu Yamaji, Yasuhiro Kashino and Hiroyuki Koike

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 43, issue 2, pages 170-176
Published in print February 2002 | ISSN: 0032-0781
Published online February 2002 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcf020
Recovery of Photosynthetic Systems during Rewetting is Quite Rapid in a Terrestrial Cyanobacterium, Nostoc commune

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Recovery processes of photosynthetic systems during rewetting were studied in detail in a terrestrial, highly drought-tolerant cyanobacterium, Nostoc commune. With absorption of water, the weight of N. commune colony increased in three phases with half-increase times of about 1 min, 2 h and 9 h. Fluorescence intensities of phycobiliproteins and photosystem (PS) I complexes were recovered almost completely within 1 min, suggesting that their functional forms were restored very quickly. Energy transfer from allophycocyanin to the core-membrane linker peptide (LCM) was recovered within 1 min, but not that from LCM to PSII. PSI activity and cyclic electron flow around PSI recovered within 2 min, while the PSII activity recovered in two phases after a time lag of about 5 min, with half times of about 20 min and 2 h. Photosynthetic CO2 fixation was restored almost in parallel with the first recovery phase of the PSII reaction center activity. Although the amount of absorbed water became more than 20 times the initial dry weight of the N. commune colony in the presence of sufficient water, about twice the initial dry weight was enough for recovery and maintenance of the PSII activity.

Keywords: Key words: Drought stress — Energy transfer — Nostoc commune — Photosynthetic electron transfer — Terrestrial cyanobacterium — Water stress.; Abbreviations: F, Chl fluorescence level during illumination with actinic light; Fo, minimum level of Chl fluorescence; Fm and Fm′, maximum level of Chl fluorescence in the dark-adapted samples and in samples illuminated with actinic light, respectively; Fv, variable part of Chl fluorescence (Fv = Fm – Fo); LCM, core-membrane linker peptide; P700, a reaction center Chl dimer of PSI.

Journal Article.  4149 words.  Illustrated.

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

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