干旱胁迫对杠柳光合特性及抗氧化酶活性的影响.pdf

,2010,30 12 : 2466- 2471 A cta Bot. Bor eal. Occid ent . Sin. :2010 1 1 1 1, 2* 李 田, 孙景宽, 田家怡 , 张文辉 1 , 256603; 2 , 300387 :, 4 , ,: 1 , P , T G , CO n r s 2 C ,P , i n 2 , W UE L UE CE ; WUE ,39%, L UE CE ,48% 33% 71% 69% 3 , SOD , POD CAT MDA , PODCAT , SOD , 12. 8% SOD ,M DA 153% :; ; ; : 948. 75 : A Photosynthesis Characteristics and Antioxidant Enzyme Activity in Perip loca sep ium Seedlings under Drought Stress 1 1 1 1, 2* LI T ian ,SUN Jingkuan ,TIAN Jiayi ,ZHANG Wenhui 1Shandong Provincial Key Laboratory of EcoEnvironmental Sciencefor Yellow River Delta, Binzhou University, Binzhou, Shan dong 256603, China; 2 College of Life Sciences, Tianjin Normal University, Tianjin 300387, China Abstract: In order to provide countermeasures for species cultivation and planting about vegetation recovery of shell islands in Yellow River Delta.With Perip loca sep ium seedlings as materials,the effects of different drought stress on gas exchange and systems of antioxidation were conducted. Four treatments were ar ranged: control, light drought, moderate drought and heavy drought. Results showed: 1 With the drought stress increasing,net photosynthesis rate first increased and then decreased,transpiration rate and stomatal conductance decreased, intercellular CO2 concentration first decreased and then increased. Under light stress,the decline of netphotosyntheticrate of P. sep ium seedlings was caused by stomatal conductance de creasing.However,it is mainly by nonstomatal factors unde