不同钠盐胁迫对夏枯草种子萌发特性的影响

为探明夏枯草种子在不同盐胁迫条件下的萌发特性。采用不同钠盐溶液(NaCl,Na2CO3,Na2SO4,NaCl与Na2CO3混和液,NaCl、Na2CO3与Na2SO4混合溶液)对夏枯草种子进行分别处理,研究不同钠盐胁迫对夏枯草种子发芽率、发芽势、活力指数、鲜重及幼苗根长和苗高的影响。与对照相比,随着不同钠盐溶液浓度的增加,夏枯草种子的发芽率、发芽指数、活力指数、鲜重及幼苗的根长和苗高呈现下降的趋势。夏枯草种子萌发在钠盐处理中表现出低浓度促进、高浓度抑制的特点,一定的低盐浓度处理下的夏枯草种子萌发指标甚至高于对照。夏枯草种子对不同钠盐胁迫的耐受性不同,不同钠盐对种子萌发的抑制程度高低顺序为Na2SO4NaCl混合盐(NaCl+Na2CO3)混合盐(NaCl+Na2CO3+Na2SO4)Na2CO3。

Effects of sodium salt stress on seed germination of Prunella vulgaris

An experiment has been conducted to investigate the germination characteristics of Prunella vulgaris seeds under different sodium salt stress treatments. P. vulgaris seeds were treated with five different types of sodium salt solution: NaCl, Na₂CO₃, Na₂SO₄, a mixture of NaCl and Na₂CO₃, and a mixture of NaCl, Na₂CO₃ and Na₂SO₄.The study investigated the effects of these treatments on germination rate, germination power, germination index, vigor index, the fresh weight of seeds, root length and seedling height. The results showed that with increasing salt concentrations the germination rate, germination index, vigor index, fresh weight, root length and seedling height of P. vulgaris seeds significantly decreased compared with the control. The indexes of P. vulgaris seed germination were promoted with lower concentrations and inhibited with higher concentrations of sodium salt. The indexes of the treatment with a low concentration rate were significantly higher than those of the control group. The order of seed germination restraint by the different sodium salt concentrations is: Na₂SO₄＜NaCl＜mixture of NaCl+Na₂CO₃＜mixture of NaCl+Na₂CO₃+Na₂SO₄＜Na₂CO₃.