Growth and Photosynthetic Responses of One C₃and Two C₄Chenopodiaceae Plants to Three CO₂Concentration Conditions

다국어 초록 (Multilingual 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.

다국어 초록 (Multilingual 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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