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以3种不同的特用玉米(沈糯6号、沈爆3号、沈甜6号)为试材,设置5个梯度的NaCl盐溶液(0、50、100、150、200mmol/L)进行盐胁迫处理,测定玉米幼苗的生长量、干物质积累量、质膜透性、活性氧代谢等的变化。结果表明,随着NaCl盐浓度的增加,植株生长量明显降低,单株鲜重、干重均明显降低,干物质积累减少,电导率不同程度地增大,丙二醛含量逐渐升高;超氧阴离子(O2-)产生速率在各处理间差异显著,随着处理浓度的增大,O2-产生速率也显著增加;超氧化物歧化酶(SOD)活性在3个品种间变化不同;过氧化物酶活性(POD)在沈糯6号和沈甜6号间表现为逐渐上升,而沈爆3号先上升后下降;过氧化氢酶(CAT)活性在3个品种间均在150mmol/L时达到最大。从总体上看,耐盐能力相对较强的是沈糯6号,较弱的是沈甜6号。
Five different special maize (Shennuo 6, Shenbao 3 and Shentian 6) were used as materials to set up five gradient NaCl NaCl solutions (0, 50, 100, 150 and 200 mmol / L) Under salt stress, the changes of corn seedling growth, dry matter accumulation, plasma membrane permeability and active oxygen metabolism were measured. The results showed that with the increase of NaCl concentration, the plant growth decreased obviously, the fresh weight and dry weight per plant decreased significantly, the dry matter accumulation decreased, the conductivity increased to some extent and the content of malondialdehyde increased gradually Oxygen anion (O2-) production rate was significantly different among the treatments. With the increase of treatment concentration, the O2- production rate also increased significantly. The activity of superoxide dismutase (SOD) The enzyme activity (POD) showed a gradual increase between Shenyou 6 and Shentian 6, while Shenbao 3 increased first and then decreased. The activity of catalase (CAT) was in the range of 150 mmol / L Reach the maximum Overall, salt tolerance is relatively Shenyou No. 6, the weaker is Shen Tian 6.