Abstract
The response ofPlantago major ssp,pleiosperma plants, grown on nutrient solution in a climate chamber, to a doubling of the ambient atmospheric CO2 concentration was investigated. Total dry matter production was increased by 30% after 3 weeks of exposure, due to a transient stimulation of the relative growth rate (RGR) during the first 10 days. Thereafter RGR returned to the level of control plants. Photosynthesis, expressed per unit leaf area, was stimulated during the first two weeks of the experiment, thereafter it dropped and nearly reached the level of the control plants. Root respiration was not affected by increased atmospheric CO2 levels, whereas shoot, dark respiration was stimulated throughout the experimental period. Dry matter allocation over leaves stems and roots was not affected by the CO2 level. SLA was reduced by 10%, which can partly be explained by an increased dry matter content of the leaves. Both in the early and later stages of the experiment, shoot respiration accounted for a larger part of the carbon budget in plants grown at elevated atmospheric CO2. Shifts in the total carbon budget were mainly due to the effects on shoot respiration. Leaf growth accounted for nearly 50% of the C budget at all stages of the experiment and in both treatments.
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Abbreviations
- LAR:
-
leaf area ratio
- LWR:
-
leaf weight ratio
- RGR:
-
relative growth rate
- R/S:
-
root to shoot ratio
- RWR:
-
root weight ratio
- SLA:
-
specific leaf area
- SWR:
-
stem weight ratio
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den Hertog, J., Stulen, I. & Lambers, H. Assimilation, respiration and allocation of carbon inPlantago major as affected by atmospheric CO2 levels. Vegetatio 104, 369–378 (1993). https://doi.org/10.1007/BF00048166
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DOI: https://doi.org/10.1007/BF00048166