Na_2CO_3胁迫对老芒麦和星星草种子萌发的影响

采用室内培养法观察了不同浓度(0、5、10、20、30、507、5 mmol/L)Na2CO3溶液胁迫下种子的发芽率、胚根及胚芽生长状况。结果表明:当Na2CO3浓度达到一定值时同德老芒麦(Elymus sibiricus cv. Tongde)为50 mmol/L、星星草(Puccinellia tenuiflora)为20 mmol/L]种子的发芽率受到显著抑制;幼根的长度与Na2CO3浓度呈现显著的负相关关系;低浓度的Na2CO3可促进胚芽的生长,高浓度则会产生抑制作用但影响不显著。说明同德老芒麦的种子萌发比星星草更耐Na2CO3胁迫。

Effect of Na2CO3 stress on seed germination of Elymus sibiricus cv. Tongde and Puccinellia tenuti flora

The seed germination rate, radical and plumule growth of Elymus sibiricus cv. Tongde and Puccinellia tenutiflora were observed under different concentrations of Na2CO3 solution (0,5,10,20,30,50,75 mmol/L) in lab. The results showed that as the concentration of Na2CO3 solution reached a certain value (50 mmol/L for E. sibiricus cv. Tongde and 20 mmol/L for P. tenutiflora), the seed germination rate was significant inhibited. The radical length negatively correlated with Na2CO3 concentration. Low concentration of Na2CO3 promoted the bud growth, while the high concentration had inhibitory effect but it was not significant. This suggested that the resistance of E. sibiricus cv. Tongde to Na2CO3 stress was stronger than P. tenutiflora.