Photosynthetica 2001, 39(2):289-297 | DOI: 10.1023/A:1013757309826

Effect of Long Term Exposure to High CO2 Concentrations on Photosynthetic Characteristics of Prunus Avium L. Plants

A. Druță1
1 Department of Botany and Plant Physiology, State Agrarian University of Moldova, Chisinau, Republic of Moldova

The effect of two elevated carbon dioxide concentrations, 700 µmol(CO2) mol-1 (C700) and 1 400 µmol(CO2) mol-1 (C1400), on photosynthetic performances of 1-year-old Prunus avium L. plant was studied. Plants grown at C700 were characterised by increased net photosynthetic rate (PN) as compared to those grown at C1400. Plant photosynthetic adjustment to C1400 resulted in 27 % higher PN than in control at atmospheric CO2 concentration (Ca) at the beginning of the experiment (3-4 weeks) with a consequent decline to the end of the experiment. Thus, 1 400 µmol(CO2) mol-1 had short-term stimulatory effect on plant PN. Both chlorophyll (Chl) a and b concentrations dramatically decreased during exposure to C1400. Compensation irradiance was increased by 57 % in C700 and by 87 % in C1400. Photochemical efficiency (φ) was affected by balloon environment, however, a clear stimulatory effect of C700 was detected. Opposite influence of both elevated CO2 concentrations on PNmax was established: slight increase by C700 (2.7 % at Ca), but considerable decrease by C1400 (63 % at Ca). Exposure to C700 enhanced compensation irradiance by 42 %, while C1400 by only 21 %. Either C700 or C1400 did not reduce stomatal conductance (gs). Leaf area per plant (LAR) was more stimulated by C700 than by C1400. High unit area leaf mass, specific leaf area, and dry matter accumulation in roots without affecting tissue density characterised plants grown in C1400. However, when considering the root : shoot ratio, these plants allocated less carbon to the roots than plants from other treatments.

Additional key words: chlorophyll fluorescence; compensation irradiance; dry mass; growth; photochemical efficiency; stomatal conductance; sweet cherry

Published: June 1, 2001  Show citation

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Druță, A. (2001). Effect of Long Term Exposure to High CO2 Concentrations on Photosynthetic Characteristics of Prunus Avium L. Plants. Photosynthetica, 39(2), 289-297. doi: 10.1023/A:1013757309826
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