Growth and Photosynthetic Responses of One C₃and Two C₄Chenopodiaceae Plants to Three CO₂Concentration Conditions
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Growth and photosynthetic responses of one C₃and two C₄plants in the family Chenopodiaceae in three CO₂concentration ([CO₂]) conditions-low (about 243 μmol mol-1, LC), present (about 378, PC), and high (about 465, HC)-were investigated in open top chambers. The relative growth rate (RGR) and net assimilation rate in the C₃plant, Chenopodium album, increased with increasing [CO₂], though the RGR was not enhanced significantly in the HC condition. The leaf area ratio and leaf weight ratio of the C₃plant drastically decreased with increasing [CO₂], suggesting that the C₃plant invests more biomass to leaves in lower [CO₂] conditions. The two C₄plants, Atriplex glauca and A. lentiformis, showed relatively small changes in those growth parameters. These photosynthetic-pathway-dependent responses suggest that growth patterns of C₃and C₄plants have been altered by past increases in atmospheric [CO₂] but that there will be relatively little further alteration in the future high-CO₂world.
Abstract
Growth and photosynthetic responses of one C₃and two C₄plants in the family Chenopodiaceae in three CO₂concentration ([CO₂]) conditions-low (about 243 μmol mol-1, LC), present (about 378, PC), and high (about 465, HC)-were investigated in open top chambers. The relative growth rate (RGR) and net assimilation rate in the C₃plant, Chenopodium album, increased with increasing [CO₂], though the RGR was not enhanced significantly in the HC condition. The leaf area ratio and leaf weight ratio of the C₃plant drastically decreased with increasing [CO₂], suggesting that the C₃plant invests more biomass to leaves in lower [CO₂] conditions. The two C₄plants, Atriplex glauca and A. lentiformis, showed relatively small changes in those growth parameters. These photosynthetic-pathway-dependent responses suggest that growth patterns of C₃and C₄plants have been altered by past increases in atmospheric [CO₂] but that there will be relatively little further alteration in the future high-CO₂world.
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