Abstract

Abstract: Acomparative study was made between the leaves of Echinochloa crusgalli grown at 580 (FACE) and 380 (control, ambient air) μmol CO₂ mol^-1 air by observation of net photosynthetic rates (Pn) and the contents of soluble protein and the key enzyme of photosynthetic carbon assimilation, Rubisco. When measured at the ambient air CO₂ concentration (380 μmol·mol^-1 ), Pn were significantly lower in leaves grown under FACEconditions than that in those leaves grown in the ambient air.This indicates that photosynthetic acclimation to high CO₂ occurs in the leaves grown under FACEconditions. Also,the stomatal conductance (Gs) and intercellular CO₂ concentration (Ci) were decreased significantly in the leaves grown under FACE. The content of total soluble protein was much lower in the leaves grown under FACEconditions than that in the control, and the content of Rubisco was also decreased in the FACEleaves, but the difference was not significant.From these results it is deduced that the photosynthetic acclimation to high CO₂ in Echinochloa crusgalli leaves grown under FACEconditions is mainly related to the partial closure of stomata and the decrease in soluble protein containing some enzymes.

CLC Number:

Q945.11

CHEN Genyun, LIAO Yi, CAI Shiqing, ZENG Qing, ZHU Jianguo, HAN Yong, LIU Gang, XU Daquan. [J]. Chinese Journal of Applied Ecology, 2002, (10): 1201-1204.

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