强光和水分胁迫对沙冬青光呼吸的影响  

Effects of Light Intensity and Water Stress on the Photorespiration of Ammopiptanthus Mongolicus (Maxim.) Cheng f.

作　　者：张莹[1] 何炎红[1] 田有亮[1] 

机构地区：[1]内蒙古农业大学林学院,内蒙古呼和浩特010019

出　　处：《安徽农业科学》2013年第24期10027-10030,共4页Journal of Anhui Agricultural Sciences

基　　金：内蒙古自治区自然科学基金项目(2011BS0509)

摘　　要：[目的]研究沙冬青在强光和水分胁迫下其光呼吸的变化。[方法]采用LI-6400光合-荧光测定仪于5月份和10月份分别测定了沙冬青的光呼吸响应曲线、光呼吸/总光合响应曲线、光呼吸-NPQ响应曲线及10月份时沙冬青光呼吸速率和NPQ的变化特征。[结果]低光胁迫时光呼吸速率和光呼吸速率/总光合速率迅速增加,高光胁迫时两者缓慢变化,10月份沙冬青光呼吸耗能强于5月份,但对强光的敏感程度不及5月份;沙冬青光呼吸速率随NPQ的增加而增加,两者呈正相关曲线关系。水分饱和亏缺条件下,光呼吸速率的初始饱和亏缺大于NPQ。[结论]光呼吸和NPQ都是沙冬青重要的光破坏防御机制;光呼吸在沙冬青抗脱水能力中发挥着重要作用。[ Objective ] Effects of light intensity and water stress on photorespiration of Ammopiptanthus mongolicus （ Maxim. ） Cheng f. were studied. [ Method ] By using LI-6400 photosynthesis-fluorescence analyzer to measure the photorespiration response curve, the photorespiration / total photosynthetic response curve and the Photorespiration-NPQ curve of Ammopiptanthus mongolicus （ Maxim. ） Cheng f. in May and Octo- ber, and to measure the photorespiration rate ofAmmopiptanthus mongolicus （Maxim.） Cheng f. , the variation characteristics of NPQ in Octo- ber. [ Result ] Under the situation of low light stress, the photorespiration rate and the photorespiration rate/total photosynthetic rate increase rapidly, change slowly under strong light stress. In October, the energy consumption of Ammopiptanthus mongolicus （ Maxim. ） Cheng f. is more than in May, but the sensitive to strong light is stronger in May. The photorespiration rate increases with NPQ, and there is a positive correlation between the two curves. Under the situation of water saturation deficit, the initial saturation deficit of the photorespiration rate is higher than NPQ. [ Conclusion ] The photorespiration rate and NPQ are the important photoprotection mechanism. The photorespiration rate plays an important role in resisting dehydration of Ammopiptanthus mongolicus （ Maxim. ） Cheng f.

关 键 词：沙冬青 光呼吸 NPQ 光破坏防御 

分 类 号：S722.3[农业科学—林木遗传育种]