盐胁迫对荠菜种子萌发的影响

Effects of Salt Stress on Seed Germination of Shepherd′s Purse

为研究Na_(2)SO_(4)、NaHCO_(3)、Na_(2)CO_(3)3种盐胁迫对荠菜种子萌发的影响,3种盐采用10、20、30、40 mmol/L溶液处理荠菜种子,测定发芽率、发芽势、发芽指数、活力指数、胚芽长、胚根长等指标,建立函数方程预测荠菜种子对3种盐的耐受值。试验结果表明,10 mmol/L Na_(2)SO_(4)促进荠菜种子发芽,其余所有处理均抑制发芽,所有处理胚芽和胚根生长受抑制。Na_(2)SO_(4)、NaHCO_(3)、Na_(2)CO_(3)的胚根生长耐受阈值为51.36、28.90、20.33 mmol/L。荠菜种子萌发对3种盐胁迫均具有一定的耐受性,耐受性依次为Na_(2)SO_(4)>NaHCO_(3)>Na_(2)CO_(3)。

To study the effects of Na2SO₄,NaHCO_(3),and Na_(2)CO_(3)salt stress on the germination of shepherd′s purse seeds,the three salts were treated with 10,20,30,40,50,60 mmol/L solutions.The germination rate,germination potential,germination index,vigor index,shoot length,and radicle length were determined,and functional equations were established to predict the tolerance values of shepherd′s purse seeds to the three salts.The results showed that 10 mmol/L Na_(2)SO_(4)promoted the germination of shepherd′s purse seeds,while all other treatments inhibited germination.The growth of shoots and radicles was suppressed under all treatments.The tolerance thresholds for radicle growth under Na_(2)SO_(4),NaHCO_(3),and Na_(2)CO_(3)stress were 51.36,28.90,20.33 mmol/L,respectively.Shepherd′s purse seed germination exhibited a certain degree of tolerance to all three salt stresses,with the tolerance order being Na2SO₄>NaHCO_(3)>Na_(2)CO_(3).