Abstract: The root systems of potato plants ( Solanum tuberosum L. ) ‘Favorita’treated with different CO₂concentrations by areoponics culture for 35 days showed an increase in plant height , leaf area , root mass , stole number , tuber mass and overall plant fresh mass for the greenhouse gas treatment (CO₂ 380 - 920μL·L ^{- 1} + O₂21 %) and outdoor air treatment (CO₂ 380μL·L ^{- 1} + O₂ 21 %) , compared with a high CO₂ concentration treatment (CO₂ 3600 μL·L ^{- 1} + O₂ 21 %) . In addition , there was an increase in stomatal conductance (G_s) of leaf ,intercellular CO₂ concentration (C_i), net hotosynthetic rate ( P_n) and photochemical efficiency ( F_v/ F_m) of leaf , at same time there was an decrease in CO₂ compensation point (Γ) , photo respiratory rate (Rp) and carboxylation efficicency (CE) for the formers. The results indicated that the appropriate CO₂ concentration (CO₂380 - 920μL·L ^{- 1} + O₂ 21 %) in the root zone may be an important reason why the areoponics culture may advance the growth and the development of potato plant .

Key words: Potato, Areoponics culture, CO₂ treatment of root zone, Photosynthesis