caa a22 4500 477100643 CHVBK 20180405111540.0 cr unu---uuuuu 170330e19960101xx s 000 0 eng 10.1007/BF00197593 doi (NATIONALLICENCE)springer-10.1007/BF00197593 Generation of rhythmic and arrhythmic behaviour of Crassulacean acid metabolism in Kalanchoë daigremontiana under continuous light by varying the irradiance or temperature: Measurements in vivo and model simulations [Elektronische Daten] [Thorsten Grams, Friedrich Beck, Ulrich Lüttge] Leaves of Kalanchoë daigremontiana Hamet et Perr. at a photon flux density (PFD) above 220 μmol·m−2s−1 (400-700 nm) or at leaf temperatures above 27.0 °C showed a rapid loss of rhythmicity, and a more or less pronounced damping-out of the endogenous circadian rhythm of CO2 exchange under continuous illumination. This rhythm was reinitiated after reduction of the PFD by 90-120 μmol·m−2·s−1 or reduction of leaf temperature by 3.5-11.0 °C under otherwise unchanged external conditions. The reduction in the magnitude of the external control parameter of the Crassulacean acid metabolism (CAM) rhythm (i.e. PFD or leaf temperature) set the phase of the new rhythm. The maxima of CO2 uptake occurred about 5, 28, 51, 75 h after the reduction. Simulations with a CAM model under comparable conditions showed a similar behaviour. The influence of temperature on the endogenous CAM rhythm observed in K. daigremontiana in vivo could be simulated by incorporating into the model temperature-dependent switch modes for passive efflux of malate from the vacuole to the cytoplasm. Thus, the model indicates that tonoplast function plays an important role in regulation of the endogenous CAM rhythm in K. daigremontiana. Springer-Verlag, 1996 Circadian rhythm nationallicence Crassulacean acid metabolism nationallicence Kalanchoe nationallicence Model simulations nationallicence Phase setting nationallicence Tonoplast nationallicence CAM : Crassulacean acid metabolism nationallicence PAR : photosynthetically active radiation nationallicence PFD : photon flux density nationallicence Grams Thorsten Institut für Botanik, Technische Hochschule Darmstadt, Schnittspahnstrasse 3-5, D-64287, Darmstadt, Germany aut Beck Friedrich Institut für Kernphysik, Technische Hochschule Darmstadt, Schloßgartenstrasse 9, D-64289, Darmstadt, Germany aut Lüttge Ulrich Institut für Botanik, Technische Hochschule Darmstadt, Schnittspahnstrasse 3-5, D-64287, Darmstadt, Germany aut Planta Springer-Verlag 198/1(1996-01-01), 110-117 0032-0935 198:1<110 1996 198 425 https://doi.org/10.1007/BF00197593 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00197593 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Grams Thorsten Institut für Botanik, Technische Hochschule Darmstadt, Schnittspahnstrasse 3-5, D-64287, Darmstadt, Germany aut NATIONALLICENCE 700 1- Beck Friedrich Institut für Kernphysik, Technische Hochschule Darmstadt, Schloßgartenstrasse 9, D-64289, Darmstadt, Germany aut NATIONALLICENCE 700 1- Lüttge Ulrich Institut für Botanik, Technische Hochschule Darmstadt, Schnittspahnstrasse 3-5, D-64287, Darmstadt, Germany aut NATIONALLICENCE 773 0- Planta Springer-Verlag 198/1(1996-01-01), 110-117 0032-0935 198:1<110 1996 198 425 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer