盐胁迫对结缕草和高羊茅种子萌发的影响

Effect of Salt Stress on the Germination of Zoysia japonica and Festuca arundinacea Seeds

用NaCl和Na2SO42种盐以9∶1的摩尔比配制浓度分别为30、60、90、120、150、180 mmol/L和210 mmol/L的混合盐溶液,作为盐胁迫处理液对结缕草和高羊茅种子进行盐胁迫发芽试验。结果表明,结缕草和高羊茅种子的发芽率均随着盐浓度的升高而呈"抛物线"型的曲线变化,结缕草的发芽率随着盐浓度的升高而降低,高羊茅的发芽率随着盐浓度的升高先升高后降低;当盐浓度达到120 mmol/L和90 mmol/L时,结缕草种子的发芽率和发芽势分别极显著地低于对照(p<0.01),当盐浓度达到150 mmol/L和120 mmol/L时,高羊茅种子的发芽率和发芽势分别显著地低于对照(p<0.01);结缕草种子萌发的耐盐半致死浓度为166.4 mmol/L,耐盐极限浓度为220.0 mmol/L,高羊茅种子萌发的耐盐半致死浓度、耐盐极限浓度分别为168.4、200.0 mmol/L;高羊茅种子萌发的耐盐性要强于结缕草。

The different concentration mixture with the molar ratio of NaCI： Na2 SO4 = 9 ： 1,30,60,90,120, 150,180 mmol/L and 210 mmol/L,were used for salt stress to measureed and analysed the germination test of Zoysia japonica and Festuca arundinacea seeds. The results showed that the germination percentage of Zoysia japonica seeds decreased, and the germination percentage of Festuca arundinacea seeds firstly increased and then decreased by parabola curve with the increase of the concentration of salt solutions. The germination per- centage with 120 mmol/L and germination vigor with 90 mmoL/L of Zoysia japonica seeds were markedly lower than CK, respectively. The germination percentage with 150 mmol/L and the germination vigor with 120 mmol/L of Festuca arundinacea seeds were markedly lower than CK, respectively. The germination percentage s of Zoysia japonica and Festuca arundinacea seeds was half of CK when the salt concentrations were 166.4 and 168.4 mmol/L. Overall, Zoysia japonica exhibited greater germination ability under salt stress than Festuca arundinacea.