水稻叶片光合作用对开放式空气CO_2浓度增高(FACE)的响应与适应  

Response and acclimation of photosynthesis in rice leaves to free- air CO_2 enrichment (FACE) .

作　　者：廖轶[1] 陈根云[1] 张海波[1] 蔡时青[1] 朱建国[2] 韩勇[2] 刘钢[2] 许大全[1] 

机构地区：[1]中国科学院上海生命科学研究院植物生理生态研究所,上海200032 [2]中国科学院南京土壤研究所,南京210008

出　　处：《应用生态学报》2002年第10期1205-1209,共5页Chinese Journal of Applied Ecology

基　　金：中国科学院知识创新重要方向项目 (KZCX2 40 8);国家自然科学基金重大国际合作研究资助项目 (4 0 12 0 14 0 817) .

摘　　要：利用便携式光合气体分析系统 (LI 6 4 0 0 ) ,比较测定了高CO2 浓度 (FACE ,free airCO2 enrich ment)和普通空气CO2 浓度下生长的水稻叶片的净光合速率、水分利用率、表观量子效率和RuBP羧化效率等光合参数 .在各自生长CO2 浓度 (380vs 5 80 μmol·mol-1)下测定时 ,高CO2 浓度 (5 80 μmol·mol-1)下生长的水稻叶片的净光合速率、碳同化的表观量子效率和水分利用率明显高于普通空气 (380 μmol·mol-1)下生长的水稻叶片 .但是 ,随着FACE处理时间的延长 ,高CO2 浓度对净光合速率的促进作用逐渐减小 .在相同CO2 浓度下测定时 ,FACE条件下生长的水稻叶片净光合速率和羧化效率明显比普通空气下生长的对照低 .尽管高CO2 浓度下生长的水稻叶片的气孔导度明显低于普通空气中生长的水稻叶片 ,但两者胞间CO2 浓度差异不显著 ,因此高CO2 浓度下生长的水稻叶片光合下调似乎不是由气孔导度降低造成的 .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 (380μmol·mol -1 CO 2) and FACE (580μmol·mol -1 CO 2).The results showed that the observed index under FACE were significantly higher than those under ambient air.Nevertheless,along with the time of high CO 2 treatment prolonged, the enhancement effect of high CO 2 on net photosynthetic rate declined gradually.At the same CO 2 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 CO 2 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.

关 键 词：水稻叶片 光合作用 响应 适应 FACE CO2浓度增高 净光合速率 气孔导度 

分 类 号：S511[农业科学—作物学]