钠盐胁迫对中华羊茅种子萌发的影响

Effects of Sodium Stress on Seed Germination of Festuca sinensis

以中华羊茅种子为材料,研究钠盐(NaHCO_(3)、NaCl+NaHCO_(3))胁迫对中华羊茅种子萌发的影响,探讨中华羊茅种子的耐盐碱能力。结果表明,随着钠盐溶液浓度的升高,中华羊茅种子的发芽率、发芽势、发芽指数和活力指数均呈先上升后下降的趋势;耐盐指数在低浓度下表现为促进,高浓度下抑制;胚根长、胚芽长均受到抑制,呈下降趋势;相同钠盐浓度条件下,NaHCO_(3)溶液对种子的萌发抑制作用更强。以种子发芽率作为钠盐胁迫适宜浓度指标的筛选并进行线性回归,确定中华羊茅种子对NaHCO_(3)溶液和NaCl+NaHCO_(3)混合溶液胁迫的半致死浓度分别为57.09 mmol·L^(-1)和90.64 mmol·L^(-1)。

In this paper,the effects of sodium salt(NaHCO_(3) and NaCl with NaHCO_(3))stress on seed germination of Festuca sinensis were studied,and the salt-and alkali-tolerance of F.Sinensis seeds were investigated.The results showed that the germination rate,germination potential,germination index and vigor index of F.Sinensis seeds increased firstly and then decreased with the increase of sodium concentration.Salt tolerance index was promoted at low concentration while it inhibited at high concentration.The radicle length and embryo length were inhibited and showed a decreasing trend.In addition,under the condition of the same sodium concentration,NaHCO_(3) solution had stronger inhibitory effect on seed germination.Further,using seed germination rate as the suitable concentration index of sodium salt stress to made linear regression,the semi-lethal concentration of F.Sinensis seeds under NaHCO_(3) solution and NaCl with NaHCO_(3) mixed solution stress were 57.09 mmol·L^(-1) and 90.64 mmol·L^(-1),respectively.