低温层积及赤霉素处理对太子参种子萌发与幼苗生长的影响

Effects of Gibberellin and Lamination Treatment at Low Temperature on Seed Germination and Seedling Growth of Pesudostellaria heterophylla

目的:研究赤霉素浓度、赤霉素浸种时间对太子参种子解除休眠及其幼苗生长的影响。方法:考察10个赤霉素浓度、5个赤霉素浸种时间结合低温层积的方法破除太子参种子休眠,测定不同条件下种子的发芽率、发芽势、幼苗株高、主根长、鲜重和干重。结果:500～600 mg.L-1的赤霉素浸种24 h后层积至45 d,发芽率均达80%,其他浓度组之间差异不显著,但均显著高于对照组;600 mg.L-1的赤霉素浸种6 h后层积至40 d,发芽率达84.17%,幼苗鲜重和干重显著高于其他浸种时间及对照组,其他浸种时间组之间差异不显著,但均显著高于对照组。结论:500～600 mg.L-1的赤霉素浸种6 h结合-2～3℃砂藏层积可明显缩短太子参种子打破休眠的时间。

Objective： To investigate the influences of different concentrations and different seed soaking times of gibberellin on breaking dormancy and seedling growth of Pesudostellaria heterophylla.Method： The methods of ten gibberellin concentrations and five seed soaking times combined with lamination at low temperature to breaking dormancy of P.heterophylla were observed.Germination rate,germination energy,plant height,taproot length,fresh weight and dry weight were determined in different conditions.Result： Soaked in 500-600 mg.L-1gibberellin for 24 hours,then treated with lamination under-2-3 ℃ for 45 days,the germination rate was over 80%,in other different concentrations no obvious difference,but were significantly higher than control group.Soaked in 600 mg.L-1 gibberellin for 6 hours,then treated with lamination under-2-3 ℃ for 40 days,the germination rate reached 84.17%.In 600 mg.L-1gibberellin group fresh weight and dry weight were significantly higher than those in other soaking times and control group.There were no obvious difference in other different seed soaking times within groups,but were significantly higher than the control group.Conclusion： The seeds breaking dormancy time of P.heterophylla could be shortened with the method of soaked in 500-600 mg.L-1 gibberellin for 6 hours,then treated with lamination under-2-3 ℃.