Effect of 100 μM SNP on NO (μMg⁻¹FW) generation in roots of wheat seedlings measured before treatment (referred as 0 h stage), and 2, 4, 6 and 8 h after treatment with Pb (50 and 250 μM, as lead nitrate).

Data represented as mean±SE of five independent replicates. Different letters in a column within a particular stage (2, 4, 6 or 8 h) represent significant difference among them at p<0.05 applying post hoc Tukey’s test. * and ** represent significant difference between treatments (with and without SNP) at p<0.05 and at p<0.01, respectively, applying two-sample t-test Effect of 100 μM SNP on NO (μMg−1FW) generation in roots of wheat seedlings measured before treatment (referred as 0 h stage), and 2, 4, 6 and 8 h after treatment with Pb (50 and 250 μM, as lead nitrate).数据以五次独立重复实验的平均值±标准误（mean±SE）表示。在特定阶段（2、4、6或8小时）的同一列中，不同字母代表组间经事后Tukey检验后，在p<0.05水平存在显著性差异。*和**分别表示通过两样本t检验分析，施加与未施加SNP（硝普钠，Sodium Nitroprusside）的处理组间，在p<0.05和p<0.01水平上存在显著性差异。本实验检测了100 μM SNP对小麦幼苗根部一氧化氮（NO，μmol·g⁻¹鲜重）生成量的影响，检测时点分别为铅（Pb，以硝酸铅形式施加，浓度为50 μM和250 μM）处理前（记为0小时阶段），以及铅处理后2、4、6和8小时。