Journal Article

Predicting the Extent of Photosystem II Photoinactivation Using Chlorophyll <i>a</i> Fluorescence Parameters Measured during Illumination

Dmytro Kornyeyev, Scott Holaday and Barry Logan

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 44, issue 10, pages 1064-1070
Published in print October 2003 | ISSN: 0032-0781
Published online October 2003 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcg129
Predicting the Extent of Photosystem II Photoinactivation Using Chlorophyll a Fluorescence Parameters Measured during Illumination

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  • Biochemistry
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The temperature dependence of the relationship between the decline in activity of photosystem II (PSII) and a chlorophyll a fluorescence parameter combining the excitation pressure (1–qP) and efficiency of excitation energy capture by open PSII reaction centers in the light-acclimated state (Fv′/Fm′) was investigated in cotton leaves. A formula for the prediction of PSII inactivation is proposed on the basis of the results obtained. By comparison of the predicted and actual levels of PSII photoinactivation, the rate of PSII recovery was estimated from chlorophyll a fluorescence parameters measured during the day for attached cotton leaves exposed to suboptimal morning temperatures in a greenhouse.

Keywords: Keywords: Cotton — Gossypium hirsutum L. — Photoinhibition — Photosystem II — Repair.; Abbreviations: EF, excessive light flux, Fv, variable chlorophyll fluorescence in dark-adapted state, Fv′, variable chlorophyll fluorescence in light-adapted state, Fm, maximal chlorophyll fluorescence in dark-adapted state, Fm′, maximal chlorophyll fluorescence in light-adapted state, NPQ, non-photochemical chlorophyll fluorescence quenching coefficient, qP, photochemical chlorophyll fluorescence quenching coefficient, PFD, photon flux density.

Journal Article.  5342 words.  Illustrated.

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

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