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1994 (1)
1Author    StefanD. Renkard3, JürgenM. Aguhnb, D. Ietm Ar Knoppik3Requires cookie*
 Title    Simultaneous Gas-Exchange and Fluorescence Measurements with Ozone-Fumigated Spruce  
 Abstract    A method was developed for carrying out gas-exchange and chlorophyll-fluorescence measurements simultaneously during fumigation of spruce twigs with peroxidic photooxi­ dants. It is thus now possible to investigate how a pollutant affects distinct sectors of the photosynthetic apparatus of the plant: whereas fluorescence reveals any changes in the pri­ mary light reaction, C 0 2 gas-exchange measurements supply information about the bio­ chemical reactions of the Calvin cycle. Results of short-time fumigation with 750 ppb ozone are presented here. Gas-exchange and fluorescence data are affected strongly in early sum­ mer, but not in autumn. The assimilation rate decreases significantly: primarily as a result of Rubisco activity and possibly because of direct inhibition of the electron-transport chain as well. Closure of the stomata leads to further reduction in the assimilation rate. Though no damage becomes visible on the needles, the perturbance of the photosynthetic apparatus caused by ozone fumigation is not reversible within 24 h. 
  Reference    Z. Naturforsch. 49c, 819—833 (1994); received June 21 1994 
  Published    1994 
  Keywords    Spruce, Photosynthetic Apparatus, Gas Exchange, Chlorophyll Fluorescence, Ozone Fumigation 
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 TEI-XML for    default:Reihe_C/49/ZNC-1994-49c-0819.pdf 
 Identifier    ZNC-1994-49c-0819 
 Volume    49