[水稻叶片光合作用对自由空气二氧化碳浓度升高（FACE）的响应与适应]

[Response and acclimation of photosynthesis in rice leaves to free-air CO2 enrichment (FACE)].

作者信息

Liao Yi, Chen Genyun, Zhang Haibo, Cai Shiqing, Zhu Jianguo, Han Yong, Liu Gang, Xu Daquan

机构信息

Institute of Plant Physiology and Ecology, Shanghai Institutes of Life Sciences, Chinese Academy of Sciences, Shanghai 200032.

出版信息

Ying Yong Sheng Tai Xue Bao. 2002 Oct;13(10):1205-9.

PMID:12557660

Abstract

The net photosynthetic rate (Pn), water use efficiency (WUE), and apparent quantum yield of carbon assimilation of rice leaves were boserved contrastively under ambient air (380 mumol.mol-1 CO2) and FACE (580 mumol.mol-1CO2). The results showed that the observed index under FACE were significantly higher than those under ambient air. Nevertheless, along with the time of high CO2 treatment prolonged, the enhancement effect of high CO2 on net photosynthetic rate declined gradually. At the same CO2 concentration, Pn and carboxylation efficiency (CE) in rice leaves under FACE were lower than those under ambient air. Although the stomatal conductances in FACE leaves was obviously lower than that in ambient leaves, their intercellular CO2 concentrations were not significantly different, which implied that the photosynthetic down-regulation in rice leaves grown under FACE was not caused by the decrease of stomatal conductance.

摘要

在环境空气（380 μmol·mol⁻¹ CO₂）和自由空气浓度升高（FACE，580 μmol·mol⁻¹ CO₂）条件下，对比观测了水稻叶片的净光合速率（Pn）、水分利用效率（WUE）和碳同化表观量子产额。结果表明，FACE条件下观测指标显著高于环境空气条件下的指标。然而，随着高CO₂处理时间延长，高CO₂对净光合速率的增强作用逐渐下降。在相同CO₂浓度下，FACE条件下水稻叶片的Pn和羧化效率（CE）低于环境空气条件下的。虽然FACE叶片的气孔导度明显低于环境空气叶片的气孔导度，但其胞间CO₂浓度无显著差异，这表明FACE条件下生长的水稻叶片光合下调并非由气孔导度降低所致。