盐胁迫对黄瓜种子萌发的影响

以山东不同种植年限设施黄瓜土壤为对象,研究并分析了土壤盐渍化状况,结果表明:所测设施土壤全盐含量为2.612 g/kg,分别是露地菜田土、大田土盐分含量的2.67倍和3.35倍;盐分离子组成主要以Mg2+、Ca2+、SO42-和NO3–为主,Mg2+、Ca2+和NO3-的大量存在可能是造成土壤盐渍化和影响黄瓜生长的主要原因。在此基础上研究了K2SO4、MgSO4、Mg(NO3)2、Ca(NO3)2、CaCl2和MgCl26种不同盐及其5种盐浓度对黄瓜种子萌发的影响。结果表明:在所选的6种盐中Mg(NO3)2对种子的损伤作用最大,其次是Ca(NO3)2,MgSO4的影响最小。种子发芽势、发芽率、相对发芽率和发芽指数都随着盐浓度的升高而降低,种子相对伤害率随着盐浓度的升高而增大,在浓度100 mmol/L时达到显著水平。

Effects of Different Salt Stress on Germination of Cucumber Seeds

The salinization situation of greenhouse soil cultivated with cucumber in different years was studied in Shandong Province.The results showed that the total salt content in greenhouse soil was 2.612 g/kg,which were 2.67 and 3.35 times of that in the open vegetable soil and field soil respectively.The most of salt ions were Mg2+,Ca2+,SO2-4 and NO-3,and the larger content of Mg2+,Ca2+ and NO-3 might be the main reasons for soil salinization and affecting cucumber growth.Based on the results,the experiment was carried out to study the effects of 5 different concentrations of K2SO4,MgSO4,Mg(NO3)2,Ca(NO3)2,CaCl2 and MgCl2 on the germination of cucumber seeds.The results showed that Mg(NO3)2 had the most significant effects on the germination of cucumber seeds followed by Ca(NO3)2,and MgSO4 had the least effect.With the increase of salt concentration,the germination energy,germination rate,relative germination rate and germination index decreased,while the relative injury rate of cucumber increased;all these indicators reached significant levels at the concentration of 100 mmol/L.