NO 对受镉胁迫下叶用莴苣光合速率的保护效应王发春（农业大学农学院 730070）摘要：以美国大速生生菜品种为试验材料，讨论一样浓度 SNP（100 mol/Lµ）保护下不同浓度（0、5、20、100 mol/Lµ）Cd 胁迫对叶用莴苣光和速率的影响。结果表明：在 Cd 胁迫下，幼苗的净光合速率（Pn）、气孔导度(Gs)、蒸腾速率(Tr)随着 Cd 浓度的增加逐渐降低，而胞间 CO2浓度(Ci)的变化相反，随着 Cd 浓度的增加逐渐增加。NO 对 Cd 胁迫下叶用莴苣净光合速率（Pn）、气孔导度(Gs)、蒸腾速率(Tr)和胞间 CO2浓度(Ci)均有极显著的保护作用，使 Pn 、Gs、Tr 均在原有水平上有所提高，在 Cd 浓度为 5 mol/Lµ时提高最大，而 Ci 则在原有水平上有所降低，在 Cd 浓度为 5 mol/Lµ时降低数值最大。关键词：叶用莴苣;Cd 胁迫;NO;光合速率;保护效应NO on cadmium stress on photosynthetic rate of leaf lettuce protective effect ofWangfachun (College of Agriculture,Gansu Agricultural University,GansuLanzhou,China)Abstrac:The United States, fast-growing lettuce cultivars with large experimental material, the same concentration of SNP (100μmol / L) under the protection of different concentrations (0,5,20,100 μmol / L) Cd stress on leaf lettuce light rate. The results showed that: in the Cd stress, the seedlings, the net photosynthetic rate (Pn), stomatal conductance (Gs), transpiration rate (Tr) with the increase of Cd concentration decreased, while the intercellular CO2 concentration (Ci) changes in contrast, With the increase of Cd concentration gradually increased. NO Cd stress on net photosynthetic rate of leaf lettuce (Pn), stomatal conductance (Gs), transpiration rate (Tr) and intercellular CO2 concentration (Ci) were highly significant protective effect, so that Pn, Gs, Tr are the original level has increased, the Cd concentration 5μmol / L to raise the maximum, while the Ci level in the former decreased in Cd concentration 5μmol / L lower value when the maxi...
