氮钾甜菜碱对水分胁迫下夏玉米叶片膜脂过氧化和保护酶活性的影响张立新.pdf

　 　 　ACTA AGRONOMICA SINICA 　007, 33(3):48 -490 http: zwxb 　 ISSN 0496-3490;CODEN TSHPA9 E-mail:xbzw @ 、、 张立新 　李生秀1, , ＊ 1 (;, 71 100) 　:, 、 9 ( )911(), 。 , (SOD)、(POD)、 (CAT), ;(MDA), MDA 。 , SOD、POD、CAT MDA ;, 。SOD POD CAT ,MDA “——”。 、 SOD、POD CAT , MDA , 。 SOD、POD、CAT , MDA , ;, , MDA , 。 。 , 、, 。 、。 :;;;;;; Effects of Nitrogen, Potassium and Glycinebetaine on the Lipid Peroxidation and ProtectiveEnzyme Activities in Water-Stressed Summer Maize ZHANG Li-Xin1, and LI Sheng-Xiu , ＊ 1 (College of Life Sciences; Resource and Environment, Northwest Sci-Tech University of Agriculture and Forestry, Yangling 71 100, Shaanxi, China) Abstract:A pot experiment was conducted underwater stress and adequatewater-supplying conditions with two cultivars of maize Shaandan 9 (drought-resistant )and Shaandan 911 (non-drought-resistant )to study the effects of nitrogen, potassium, and glycinebetaine on lipid peroxidation and protective enzyme activities in maize leaves at different growing stages for revealing their biological functions in the rise of crop resistance to drought by raising activities of these protective enzymes.Results showed that under the water stress condition, activities of superoxide dismutase (SOD), catalase (CTA ), and peoxidase (POD)in leaves were significantly reduced while malondialdehyde (MDA )content was increased for both cultivars, but the decline was more obvious for the non-drought resistant one.Activities and variation of SOD, CTA, and PODwere higher while MDA content was lower for the drought resistant cultivar (Shaandan 9)than those for the non- drought resistant cultivar (Shaandan 911).The lower activities of SOD, CTA, and POD at seeding stage than those at elo