Photosynthetic Physiological Response to Drought Stress of Populus euphratica at Different Ages in Minqin  

作　　者：Chunxiu GUO Jianping MA Junmei MA Duoqing MAN Fei WANG Yunian ZHANG Peng ZHAO 

机构地区：[1]State Key Laboratory Breeding Base of Desertification and Aeolian Sand Disaster Combating,Wuwei 733000,China [2]Minqin National Station for Desert Steppe Ecosystem Studies,Minqin 733300,China [3]Gansu Desert Control Research Institute,Lanzhou 730070,China

出　　处：《Agricultural Biotechnology》2020年第4期26-30,44,共6页农业生物技术（英文版）

基　　金：Supported by Research and Development Program of Gansu Province(17YF1FA113);The National Natural Science Foundation of China(31560128).

摘　　要：[Objectives]This study was conducted to investigate the photosynthetic physiological characteristics of Populus euphratica trees at different forest ages in the desert area of Minqin in response to drought stress.[Methods]With P.euphratica trees of different ages in Minqin as the research object,the water characteristics and photosynthetic physiological indexes(chlorophyll,soluble sugar,POD,SOD and MDA)were compared under different conditions.[Results]On the time gradient,the soil water contents of P.euphratica of different ages decreased continuously with the extension of irrigation stop time,but the decreases were small.Under the same stress treatment,the soil water contents of P.euphratica of different ages increased with the deepening of soil layer,but the differences were not significant(P>0.05).Under normal condition,the chlorophyll contents of P.euphratica at three ages gradually increased with the increase of age.The chlorophyll contents in leaves of P.euphratica at different ages were all lower under normal condition and higher under water stress.The changes of POD and SOD activity in leaves of P.euphratica at different ages under different conditions were basically the same,showing that the enzyme activity was higher under water stress than under normal under.The MDA contents in leaves of the young and middle P.euphratica forests were higher under water stress at 7 and 21 d than under normal condition,and the differences were not significant(P>0.05);and the MDA content in leaves of the mature P.euphratica forest was higher under water stress at 21 and 35 d than under normal condition.Drought stress has a certain effect on the photosynthetic physiological characteristics of P.euphratica.In summary,under drought stress,the chlorophyll content,SOD and POD activity,and MDA molar concentration in the leaves of P.euphratica were basically higher than under normal condition,indicating that P.euphratica could resist drought environment through osmotic adjustment and showed strong drought resistance.[Conclusions

关 键 词：Minqin Different ages P.euphratica Drought stress Photosynthetic physiological characteristics 

分 类 号：S792.11[农业科学—林木遗传育种]