Variations in Relationship Between Stomotal Conductance and Photosynthesis Rate in C3 and C4 Crops under Different Light and CO2 Conditions

doi:10.7668/hbnxb.2008.01.016

Abstract

Abstract: The coupled processes of leaf photosynthesis and transpiration are controlled by stomotal,and the relation2ship between stomotal conductance and photosynthesis rate is the basis of understanding carbon and water cycle in terres2trial ecosystem. The differences in the relationship between stomotal conductance and photosynthesis rate in C3and C₄plant species were studied under controlled light density and CO₂concentration by LI26400 Portable Photosynthesis Sys2tem. The results showed:Ball2Berry model can reasonably simulate the relation between stomotal conductance and photo2synthesis rate even under various CO₂concentration conditions. The coefficient between stomotal conductance and photo2synthesis rate revealed the difference in the ratio of water2carbon exchange,and in the limitations of stomotal and interphysiochemical processes between the different crop types.Because obvious differences in the coefficient between stomotalconductance and photosynthesis rate were found between C₃and C4crops,and between terricolous and aquicolous C₃crops,the crop ecotype can be generally distinguished three types:C4,terricolous and aquicolous C₃crops. The differentia2tion of crop ecotype will improve the accuracy in modeling carbon and water cycle in regional scale.

Key words: C₃crop, C₄crop, Stomotal conductance, Photosynthesis rate, Ecotype

CLC Number:

Q945

WANG Jian-lin, LIN Rong-fang, YU Gui-rui, FANG Quan-xiao, JIANG Defeng, QI Hua, WANG Qiu-feng, LI Ju-hua, LIU Zhao-li. Variations in Relationship Between Stomotal Conductance and Photosynthesis Rate in C₃ and C₄ Crops under Different Light and CO₂ Conditions[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2008, 23(1): 71-75. doi: 10.7668/hbnxb.2008.01.016.

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References

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Variations in Relationship Between Stomotal Conductance and Photosynthesis Rate in C₃ and C₄ Crops under Different Light and CO₂ Conditions

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