两年的试验结果表明,在土壤缓慢脱水和长期水分胁迫下,四个小麦品种叶片均产生渗透调节,孕穗期和灌浆期渗透调节能力较强,渗透调节的幅度为0.40～0.64MPa,抗旱性强的品种大于抗旱性弱的品种.由于渗透调节在土壤含水量60%左右或轻度胁迫下,叶片膨压基本不变.五个生育期四个处理水平叶水势与膨压回归分析,从水势每下降一个单位,膨压降低的单位数看,昌乐5号(0.146)<山农587(0.151)<烟农15(0.162)<济南13(0.240),抗旱性强的品种由于渗透调节能力强,膨压降低的单位数小,维持膨压的程度高. The results of two years showed that under the conditions of slow soil dewatering and long-term water stress, all four wheat cultivars had osmotic adjustment, strong osmotic adjustment at booting stage and grain filling stage, osmotic adjustment ranged from 0.40 to 0.64 MPa, drought resistance Strong varieties are more than the drought-resistant varieties.Because of osmotic adjustment in the soil moisture content of about 60% or mild stress, the leaf turgor pressure basically unchanged.The five growth stages of the four treatment levels of leaf water potential and turgor regressive analysis, from For each unit of water potential drop and turgor pressure reduction, Changle No.5 (0.146)