碱胁迫对结缕草、高羊茅种子萌发及其胚生长的影响

Effects of Alkaline Stress on Seeds Germination and Embryo Growth of Zoysia japonica and Festuca arundinacea

用NaHCO3和Na2CO3两种碱性盐以9∶1的摩尔比配制浓度分别为30、60、90、120 mmol/L的混合盐溶液作为碱胁迫处理液,对结缕草和高羊茅种子进行碱胁迫发芽试验。结果表明,在碱胁迫下,结缕草和高羊茅种子的发芽率、发芽势、发芽指数以及胚芽长和胚根长均随着碱胁迫浓度的升高而呈降低趋势,碱浓度达到90 mmol/L和120 mmol/L时,相应的结缕草和高羊茅种子均未萌发;结缕草和高羊茅种子萌发耐碱性的临界值分别为30 mmol/L和60 mmol/L;高羊茅种子萌发的耐碱性强于结缕草。

The salt solutions with the molar ratio of NaHCO3∶Na2CO3=9∶1,30,60,90 and 120mmol/L were used for alkaline stress to measure and analyse the germination and the growth of radical and plumule of Zoysia japonica and Festuca arundinacea seeds.The results showed that the seed germination percentage,germination energy,germination index and length of radical and plumule markedly decreased with the increasing of alkaline solutions concentration.Zoysia japonica and Festuca arundinacea seeds did not germinate when the concentration of alkaline solutions reached to 90mmol/L and 120mmol/L,and 30mmol/L and 60mmol/L were critical concentrations to germination of Zoysia japonica and Festuca arundinacea seeds,respectively.The alkaline tolerance ability of Festuca arundinacea seeds were stronger than that of Zoysia japonica seeds.