Photosynthetica 2000, 38(4):621-627 | DOI: 10.1023/A:1012473810283
Acclimation of Photosystem 2 Function of Norway Spruce Induced during First Season under Elevated CO2 in Lamellar Domes
- 1 Department of Physics, Faculty of Science, University of Ostrava, Ostrava, Czech Republic
- 2 Department of Physics, Faculty of Science, University of Ostrava, Ostrava, Czech Republic
- 3 Department of Physics, Faculty of Science, Palacký University, Olomouc, Czech Republic
- 4 Laboratory of Ecological Physiology of Forest Trees, Institute of Landscape Ecology, Czech Republic
Since July 28th, 1997 the two experimental mini-stands of young Norway spruce [Picea abies (L.) Karst.] have been grown in lamellar domes at ambient (AC) and elevated concentrations of CO2 [EC, i.e., ambient + 350 µmol(CO2) mol-1]. Before the start of exposure to EC (June 1997) the dependencies of photosystem 2 (PS2) quantum yield (Y) on irradiance, estimating the efficiency of PPFD utilisation in PS2 photochemistry, were the same for AC and EC shoots. After one month of EC simulation (August 1997), Y values were higher for EC needles as compared with the AC ones (by 1-42 %), whereas two months later (October 1997) an opposite effect was observed (decrease of Y by from 1 to 33 %). By chlorophyll a (Chl a) fluorescence induction the effects of EC on PS2 function were further characterised. During the first month a moderate improvement of PS2 function was estimated for EC needles from slightly higher potential yield of PS2 photochemistry (FV/FM, by 1 %) and reduced amount of inactive PS2 reaction centres (relative Fp1 level, by 15 %). However, the prolonged exposure to EC led firstly to a slight but significant decrease of FV/FM (by 3 %), secondly to a reduction of half time of fluorescence rise (t1/2, by 14 %), and finally to pronounced accumulation of inactive PS2 reaction centres (by 41 %). From the gradual response of individual Chl a fluorescence parameters we suggest a probable sequence of events determining the stimulation and subsequent depression of PS2 function for Norway spruce during the first season under EC.
Additional key words: chlorophyll fluorescence induction; dry and fresh matter; Picea abies
Prepublished online: August 1, 2000; Published: November 1, 2000 Show citation
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