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Gewählte Publikation:

Chen, K; Hu, GQ; Keutgen, N; Janssens, MJJ; Lenz, F.
(1999): Effects of NaCl salinity and CO2 enrichment on pepino (Solanum muricatum Ait.) - II. Leaf photosynthetic properties and gas exchange
SCI HORTIC-AMSTERDAM. 1999; 81(1): 43-56. FullText FullText_BOKU

Abstract:
One-month old, rooted semi-hardwood cutting plants of pepino cv. Xotus in sand-potted culture were treated with 200 ml Hoagland nutrient solution with or without additional 25 mM NaCl twice a week for 2 months, and exposed to 350 +/- 10, 700 +/- 10 or 1050 +/- 10 ppm CO2 in controlled environment chambers during the last month of the experiment. Both NaCl salinity in the rhizosphere and atmospheric CO2 enrichment reduced the leaf content of total chlorophyll, chlorophyll a and chlorophyll b, as well as stomatal conductance and transpiration rate, but raised intercellular CO2 concentration and C2H4 emission of leaves. Minimal fluorescence yield, maximal fluorescence yield, variable fluorescence yield of dark-adapted leaves, optimal quantum yield and effective quantum yield of PS II, photochemical quenching coefficient, net photosynthetic rate, leaf water-potential, and photosynthetic water-use efficiency decreased under NaCl stress, but rose with an increase of the atmospheric CO2 concentration. In addition, the non-photochemical quenching coefficient and the dark respiration rate of leaves increased due to NaCl salinity and decreased at high CO2 conditions. On average, net photosynthetic rate and photosynthetic water-use efficiency of leaves decreased by 26-35% and 19-29% due to the presence of NaCl stress in the root medium, but increased by 75-98% and 85-123% at 700 ppm CO2, and by 72-91% and 124-147% at 1050 ppm CO2 in comparison with 350 ppm CO2 treatments. Under NaCl stress, high CO2 improved photosynthetic water-use efficiency of leaves. (C) 1999 Elsevier Science B.V. All rights reserved.
Autor/innen der BOKU Wien:
Keutgen Norbert
BOKU Gendermonitor:


Find related publications in this database (Keywords)
chlorophyll content
chlorophyll fluorescence
stomatal conductance
intercellular CO2 concentration
net photosynthesis
dark respiration
C2H4 emission
leaf water-potential
transpiration
photosynthetic water-use efficiency


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