Journal Article

Cooperation of Photosystems II and I in Leaves as Analyzed by Simultaneous Measurements of Chlorophyll Fluorescence and Transmittance at 800 nm

Hillar Eichelmann and Agu Laisk

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 41, issue 2, pages 138-147
Published in print February 2000 | ISSN: 0032-0781
Published online February 2000 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/41.2.138
Cooperation of Photosystems II and I in Leaves as Analyzed by Simultaneous Measurements of Chlorophyll Fluorescence and Transmittance at 800 nm

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Parallel measurements of CO2 assimilation, Chl fluorescence and 800 nm transmittance were carried out on intact leaves of wild type and cytochrome b6/f deficient transgenic tobacco grown at two different light intensities and temperatures, with the aim to diagnose processes limiting quantum yield of photosynthesis and investigate their adaptations to growth conditions. Relative optical crosssections of PSII and PSI antennae were calculated from measured gas exchange rates and fluorescence-related losses at PSII and P700 oxidation-related losses at PSI. In nonstress conditions (high light grown wild type and low light grown antisense type) optimal relative optical cross-section of PSII (a11) was 0.48–0.51 and that of PSI (a1) was 0.38–0.40, leaving a non-photosynthetic absorption cross-section (a0) of 0.09–0.14 for nitrite assimilation and absorption in PSIIβ and other photosynthetically inactive pigments. Stress conditions (low light grown wild type and high light grown antisense type, elevated growth temperatures) tend to increase a0 and decrease PSII antenna crosssection more than that of PSI antenna, but this rule is reversed during senescence.

Keywords: Chlorophyll fluorescence; P700; Photosynthesis; Quantum yield

Journal Article.  0 words. 

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

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