caa a22 4500 397522509 CHVBK 20180308164636.0 cr unu---uuuuu 161202e199503 xx s 000 0 eng 10.1093/jxb/46.3.309 doi (NATIONALLICENCE)oxford-10.1093/jxb/46.3.309 Photosynthesis of terrestrial cyanobacteria under light and desiccation stress as expressed by chlorophyll fluorescence and gas exchange [Elektronische Daten] [U. Lüttge, B. Büdel, E. Ball, F. Strube, P. Weber] Terrestrial mats of cyanobacteria with other associated microscopical cryptogams were obtained from various sites in the tropics, i.e. rocks of mountains and rock-outcrops and bare soil surfaces, a valley in the Austrian Alps and a glasshouse. Species diversity of each sample was analysed qualitatively. The samples came from very different light climates. Responses to light and desiccation stress were studied using the saturation pulse method for recording chlorophyll fluorescence variables as well as by measuring net CO2 and O2 exchange in order to confirm results by independent methods. Under light stress, shade and high-light, samples showed a reduction of gas exchange and of the fluorescence variables photochemical fluorescence quenching coefficient (qp), potential quantum yield of photosystem II (FvIFm) and effective quantum yield (ΔFIFm) and recovery to different degrees. Short-term desiccation led to suppression of variable fluorescence yield and inhibition of gas exchange, but recovery occurred rapidly within 1 h after rewetting. It is concluded that together with the well-known ability for assimilation of atmospheric dinitrogen, desiccation tolerance of terrestrial cyanobacteria mats is the major reason for their success as pioneers on bare substrata. In addition, the capacity to produce sun and shade forms adapted to a very wide range of light intensities appears to be important. © Oxford University Press Research Papers nationallicence Chlorophyll fluorescence nationallicence desiccation nationallicence photoinhibition nationallicence terrestrial cyanobacteria nationallicence Lüttge U. Institut für Botanik, Technische Hochschule Darmstadt Schnittspahnstrasse 3-5, D-64287 Darmstadt, Germany aut Büdel B. Institut für Botanik, Technische Hochschule Darmstadt Schnittspahnstrasse 3-5, D-64287 Darmstadt, Germany aut Ball E. Institut für Botanik, Technische Hochschule Darmstadt Schnittspahnstrasse 3-5, D-64287 Darmstadt, Germany aut Strube F. Institut für Botanik, Technische Hochschule Darmstadt Schnittspahnstrasse 3-5, D-64287 Darmstadt, Germany aut Weber P. Institut für Botanik, Technische Hochschule Darmstadt Schnittspahnstrasse 3-5, D-64287 Darmstadt, Germany aut Journal of Experimental Botany Oxford University Press 46/3(1995-03), 309-319 0022-0957 46:3<309 1995 46 exbotj https://doi.org/10.1093/jxb/46.3.309 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/jxb/46.3.309 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lüttge U. Institut für Botanik, Technische Hochschule Darmstadt Schnittspahnstrasse 3-5, D-64287 Darmstadt, Germany aut NATIONALLICENCE 700 1- Büdel B. Institut für Botanik, Technische Hochschule Darmstadt Schnittspahnstrasse 3-5, D-64287 Darmstadt, Germany aut NATIONALLICENCE 700 1- Ball E. Institut für Botanik, Technische Hochschule Darmstadt Schnittspahnstrasse 3-5, D-64287 Darmstadt, Germany aut NATIONALLICENCE 700 1- Strube F. Institut für Botanik, Technische Hochschule Darmstadt Schnittspahnstrasse 3-5, D-64287 Darmstadt, Germany aut NATIONALLICENCE 700 1- Weber P. Institut für Botanik, Technische Hochschule Darmstadt Schnittspahnstrasse 3-5, D-64287 Darmstadt, Germany aut NATIONALLICENCE 773 0- Journal of Experimental Botany Oxford University Press 46/3(1995-03), 309-319 0022-0957 46:3<309 1995 46 exbotj Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford