夏枯草种子萌发及其幼苗生长对干旱胁迫的响应

Seed Germination and Seedling Growth of Prunella vulgaris L. in Response to Drought Stress

[目的]探讨干旱胁迫对夏枯草种子及其幼苗生长的影响。[方法]采用不同浓度的聚乙二醇(PEG-6000)对夏枯草种子进行处理,测定种子发芽率、发芽指数、发芽势以及幼苗的主根长、株高、鲜重、干重等指标。[结果]随干旱强度的增加,不同浓度的PEG干旱胁迫对夏枯草种子萌发及幼苗生长产生不同程度的影响。[结论]低浓度(2.5%~5.0%)PEG胁迫作用小,高浓度(10.0%~15.0%)PEG胁迫作用大;10.0%浓度PEG促使地下根长生长;对于地上部分,低浓度抑制不明显,高浓度各指标均产生显著抑制。

[ Objective ] To discuss the effects of drought stress on germination of Prunella vulgaris L. seeds and seedling growth. [ Method ] By using different concentrations of polyethylene glycol（ PEG - 6000）, seed germination rate （ Gr）, germination index （ GI ） , germination potential （Gp）and seedling root length, plant height, fresh weight and dry weight indicators were determined. [ Result] The results indicated that different pEG concentrations had different effects on the germination of P. vulgaris seeds and seedlings growth with the increase of drought intensity. [ Conclusion] Low concentrations（2.5% -5.0% ） of PEG have the little effects on P. vulgaris seeds, while high concentrations （ 10. 0% - 15.0% ） have a large effects, 10.0% concentration promotes the growth of underground part, for the overground part, low concentration suppression is not obvious, high concentrations of various indexes significantly inhibit.