Distribution of excitation energy between photosystems 2 and 1 upon adaptation of high-CO2 grown cells of Chlorella vulgaris sp. K to low CO2

The 77 K fluorescence emission was measured on Chlorella cells at regular intervals during adaptation of high CO2 (1.8 % CO2 v/v) grown cells to air level of CO2. The ratios of the peaks at 686 and 697 nm (photosystem 2, PS 2, fluorescence) to the peak at 720 nm (PS 1 fluorescence) decreased and app...

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Bibliographic Details
Published inPhotosynthetica Vol. 27; no. 3
Main Authors Demidov, E.D, Elfimov, E.I. (Russian Academy of Sciences, Pushchino (Russian Federation). Inst. of Soil Science and Photosynthesis)
Format Journal Article
LanguageEnglish
Published 01.09.1992
Subjects
ADAPTACION
ADAPTATION
CHLOROPHYCEAE
DIOXIDO DE CARBONO
DIOXYDE DE CARBONE
ECHANGE D'ENERGIE
FOTOSINTESIS
INTERCAMBIO DE ENERGIA
PHOTOSYNTHESE
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Summary:The 77 K fluorescence emission was measured on Chlorella cells at regular intervals during adaptation of high CO2 (1.8 % CO2 v/v) grown cells to air level of CO2. The ratios of the peaks at 686 and 697 nm (photosystem 2, PS 2, fluorescence) to the peak at 720 nm (PS 1 fluorescence) decreased and approached a constant level in about 1.5 h. The external concentration of dissolved inorganic carbon required for the half-maximum rates of CO2-dependent O2 evolution, K0.5, also decreased and reached a constant level after the same period of adaptation. Hence the increased demand for ATP/NADPH during the CO2 assimilation by the "CO2-concentrating mechanism" induces the redistribution of excitation energy from PS 2 to PS 1 and increases formation of ATP by the cyclic photophosphorylation.
Bibliography:F61
F60
9400224
ISSN:0300-3604
1573-9058