摘要
两个小麦品种叶片渗透调节能力随土壤缓慢脱水而增加，昌乐５号约为０．２９ＭＰａ，鲁麦５号约为０．１９ＭＰａ。随着土壤脱水的加剧，光合作用受抑制的原因有一个从气孔限制向叶肉细胞光合活性限制的转变过程。渗透调节对干旱条件下光合作用的维持和供水后光合作用的恢复都有一定的贡献。用改良法测定两二醇含量，结果表明，抗旱品种昌乐５号的丙二醇含量没有增加，这与其内源保护酶（ＳＯＤ）活性在严重干旱条件下较高有关。相反，鲁麦５号在严重干旱条件下由于其ＳＯＤ酶活性下降，丙二醇含量显著高于对照，表明发生了膜脂过氧化。
The osmotic adjustment ability of leaves in two winter wheat varieties increased by 0.29 MPa for Changle 5 and 0.19 MPa for Lumai 5 as soil dehydrated. A change from stomatal to nonstomatal limitation of photosynthesis was observed. Osmotic adjustment contributed definitely to photosynthesis maintaining under water stress and restoration of photosynthesis after rewatering. Malonyldialdehyde (MDA), an index of membrane lipid peroxidation, was measured with a modified method. Results showed that MDA concentration in Changle 5, a strong drought resistant wheat variety, did not raise, which was related to its relative high SOD activity under severe drought. On the contrary, MDA concetration in Lumai 5 with a decrease of SOD activity increased significantly under severe drought, indicating that membrane lipid peroxidation occurred.
出处
《山东农业大学学报（自然科学版）》
CSCD
1994年第1期9-14,共6页
Journal of Shandong Agricultural University：Natural Science Edition
关键词
冬小麦
土壤缓慢脱水
渗透调节
winter wheat
slow soil dehydration, osmotic adjustment, photosynthesis,membrane lipid peroxidation
