水杨酸对干旱胁迫下夏枯草种子萌发的影响

Effects of Salicylic Acid on Seed Germination of Prunella Vulgaris under Drought Stress

用0.5~3.0 mmol/L水杨酸（SA）溶液对夏枯草种子进行浸种处理,然后用0.2 g/m L聚乙二醇（PEG）6000溶液模拟干旱胁迫,探讨SA对干旱胁迫下夏枯草种子萌发的影响。研究结果表明：干旱胁迫显著降低了夏枯草种子的萌发,严重抑制了夏枯草幼苗的生长。在0.5~3.0 mmol/L SA浸种处理下,夏枯草种子的萌发指标与幼苗生长指标均有不同程度的增加。1.5~2.0 mmol/L SA处理,可以显著提高夏枯草种子的发芽率、发芽势、发芽指数、活力指数、胚根长指标和鲜质量指标。以2.0 mmol/L SA浸种处理效果最佳,过高浓度的SA处理会降低其干旱缓解效果。

Prunella vulgaris seeds were presoaked with different concentrations( 0. 5 ~ 3. 0 mmol / L) salicylic acid( SA). Then Prunella vulgaris seeds were soaked in 0. 2 g / mL polyethylene glycol 6000 for simulating drought stress conditions to explore the effects of salicylic acid( SA) solutions on seed germination. The results show that seed germination and seedling growth of Prunella vulgaris are significantly inhibited by drought stress. Prunella vulgaris seed germination index and seedling growth index are increased to some extent after0. 5 ~ 3. 0 mmol / L SA treatments. The treatment at 1. 5 ~ 2. 0 mmol / L SA can significantly improve seed germination rate of Prunella vulgaris,as well as germination energy,germination index,vigor index,radicle length and fresh weight. The best remission effect is obtained at 2. 0 mmol / L concentration of SA solution,and the excessive SA concentration can reduce the drought remission effect.