干旱胁迫对多根葱种子萌发和幼苗生长的影响

[目的]研究干旱胁迫对多根葱种子萌发和幼苗生长的影响。[方法]干旱是限制草原植物种子萌发的主要条件之一。以克氏针茅典型草原的多根葱种子为研究对象,采用纸上发芽法,用不同浓度的PEG6000模拟干旱胁迫培育种子,研究了不同梯度干旱胁迫对多根葱种子发芽率、活力指数、胚根、胚芽等指标的影响。[结果]PEG对多根葱种子萌发和幼苗生长具有显著影响,随着PEG浓度的增加,发芽速度、发芽率、发芽指数、活力指数、胚根与胚芽的长度、胚根的干重逐渐降低,而胚芽干重变化不明显。多根葱能在0-5%PEG干旱条件下较好的萌发和生长,PEG浓度大于10%,多根葱萌发和幼苗生长受到明显抑制。[结论]该研究可为干旱胁迫下多根葱种子的萌发提供指导。

Effect of Drought Stress on Seed Germination and Seedling Growth of Allium polyrhizum

[Objective]To study effect of drought stress on seed germination and seedling growth of Allium polyrhizum.[Method]Drought is one of the main factors for limiting the seed germination of grassland plants.Taking the Allium polyrhizum seeds from the Stipa Krylovii steppe as research object, the germination percentage,vigor index,radicle,embryo of A.polyrhizum seeds were tested on filter paper under different concentrations of PEG6000 to simulate the drought stress.[Result]PEG had significant effects on the seed germination and seedling growth, the indexes reduced gradually with the increase of PEG concentration, such as germination speed,germination rate, germination index, vigor index, the length of radicle and embryo, dry weight of radicle, but the dry weight of embryo was not significant.A.polyrhizum germinated and grew normally under the drought condition of 0-5%PEG, the germination and seedling growth of A.polyrhizum was significantly inhibited when the PEG concentrations was greater than 10%.[Conclusion]The research can offer guidance for A.polyrhizum seedling germination under drought stress.