Response of Photosynthetic Rate and Stomatal Conductance of Oat to Light Intensity and CO2 Concentration and Its Modeling

doi:10.7668/hbnxb.2009.03.029

Abstract

Abstract: The response of photosynthetic rate and stomatal conductance of oat to light intensity and CO₂concentra2 tion was studied using LI26400 in Inter Mongol China. Generally,photosynthetic rate increased with light intensity (PPFD),which could be expressed by Michaelis2Menten function. The maximum photosynthetic rate (P_max,i) was 18. 63 μ mol/ (m²· s) under natural CO₂concentration. The photosynthetic rate increased with CO₂concentration,which could be expressed by Michaelis2Menten function too. The maximum photosynthetic rate (P_max,c) was 110. 28μ mol/ (m²· s) under saturated light intensity (PPFD) while [CO₂] →∞. The response of stomatal conductance to light intensity could be ex2 pressed by Michaelis2Menten function too,because stomatal conductance increased with light intensity (PPFD),but the stomatal conductance will decrease with increase of CO₂concentration. The stomata limitation increased with light intensity (PPFD) and CO₂concentration,but when [CO₂] > 200μ mol/ mol,stomata limitation kept constant.

Key words: Oat, Photosynthetic rate, Stomatal conductance, Light intensity, CO₂concentration

CLC Number:

S512.601

WANG Jian lin. Response of Photosynthetic Rate and Stomatal Conductance of Oat to Light Intensity and CO₂ Concentration and Its Modeling[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2009, 24(3): 134-137. doi: 10.7668/hbnxb.2009.03.029.

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