Journal Article

Osmotic Stress Induces Inactivation of Photosynthesis in Guard Cell Protoplasts of <i>Vicia </i>Leaves

Chang-Hyo Goh, Rainer Hedrich and Ulrich Schreiber

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 42, issue 10, pages 1186-1191
Published in print October 2001 | ISSN: 0032-0781
Published online October 2001 | e-ISSN: 1471-9053 | DOI: https://dx.doi.org/10.1093/pcp/pce149
Osmotic Stress Induces Inactivation of Photosynthesis in Guard Cell Protoplasts of Vicia Leaves

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  • Biochemistry
  • Molecular and Cell Biology
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Guard cell protoplasts isolated from Vicia leaves showed a strong suppression of the photosynthesis under hypotonic conditions, as reflected by changes in the chlorophyll fluorescence characteristics. The response was reversible as well. Mesophyll cell protoplasts did not show any lowering of photosynthetic activity under hypo-osmotic conditions. This result indicates that the response was guard cell specific.

Keywords: Key words: Chlorophyll a fluorescence — Guard cell protoplast — Osmotic stress — Photosynthesis — Vicia faba.; Abbreviations: AL, actinic light; ETR, relative electron transport rate; Fo, dark level of fluorescence yield; Fm, maximum level of fluorescence yield; Fv, variable fluorescence yield, Fm–Fo; GCPs, guard cell protoplasts; MCPs; mesophyll cell protoplasts; ML, measuring light; PAM, pulse-amplitude modulation; SP, saturating light pulse; Y, the effective quantum yield of PSII defined as ΔF/Fm′ = (Fm′–F)/Fm′.

Journal Article.  3364 words.  Illustrated.

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

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