土壤水分胁迫下小麦叶片的渗透调节与膨压维持

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.

Turgor Pressure Maintenance and Osmotic Adjustment of Wheat Leaves under Soil Water Stress

The experimental results for two years showed that the leaves of four wheat cultivars produced osmotic adjustment under long soil water stress and slowly soil dewatering conditions. The osmotic adjustment ability of ear pregnant stage and grain filling stage was stronger than that of others. The degree of osmotic adjustment was 0.40-0.64MPa in wheat leaves. The ability of osmotic adjustment of cultivars with strong drought resistance was stronger than that of cultivars with weak drought resistance. The turgor pressure of wheat leaves was almost not changed by osmotic adjustment under mild stress or 60% of soil water content. For four treatments of five development stages, the results of regression analysis of turgor pressure and leaf water potential showed that turgor pressure decreased units when leaf water potential changed one unit: Changle NO. 5 (0.146)