Abstract
In order study C3 and C4 plant growth in atmospheric CO2 levels ranging from past through predicted future levels, Abutilon theophrasti (C3) and Amaranthus retroflexus (C4) were grown from seed in growth chambers controlled at CO2 partial pressures of 15 Pa (below Pleistocene minimum), 27 Pa (pre-industrial), 35 Pa (current) and 70 Pa (predicted future). After 35 days of growth, CO2 had no effect on the relative growth rate, total biomass or partitioning of biomass in the C4 species. However, the C3 species had greater biomass accumulation with increasing CO2 partial pressure. C3 plants grown in 15 Pa CO2 for 35 days had only 8% of the total biomass of plants grown in 35 Pa CO2, C3 plants had lower relative growth rates and lower specific leaf mass than plants grown in higher CO2 partial pressures, and aborted reproduction. C3 plants grown in 70 Pa CO2 had greater root mass and root-to-shoot ratios than plants grown in lower CO2 partial pressures. These findings, support other studies that show C3 plant growth is more responsive to CO2 partial pressure than C4 plant growth. Differences in growth responses to CO2 levels of the Pleistocene through the future suggest that competitive interactions of C3 and C4 annuals have changed through geologic time. This study also provided evidence that C3 annuals may be operating near a minimum CO2 partial pressure for growth and reproduction at 15 Pa CO2.
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Dippery, J.K., Tissue, D.T., Thomas, R.B. et al. Effects of low and elevated CO2 on C3 and C4 annuals. Oecologia 101, 13–20 (1995). https://doi.org/10.1007/BF00328894
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DOI: https://doi.org/10.1007/BF00328894