聚乙二醇(PEG)对实葶葱种子吸胀冷害的渗透调节

【目的】证实实葶葱种子是否存在吸胀冷害以及PEG对该现象是否存在渗透调节。【方法】基于种子萌发试验,分别测定了在5℃条件下及在PEG浓度分别为0%、10%、15%、20%、25%和30%条件下,实葶葱种子低温吸胀1、2、3、5和7 d后的相对电导率、发芽率、发芽指数和活力指数。【结果】在5℃条件下,实葶葱的种子萌发存在吸胀冷害。超过临界时间2 d的5℃吸胀,实葶葱种子萌发受到抑制。【结论】通过PEG渗透干预,可显著改善5℃吸胀冷害下实葶葱种子的萌发,随着吸胀冷害时间的延长,PEG调控种子萌发的适宜浓度逐渐升高。

Effects of PEG Osmotic Conditioning on Imbibitional Chilling Injury of Seeds Germination of Allium Galanthum L.

Objective]In order to prove whether Allium galanthum L. has imbibitional chilling injury and whether PEG has osmotic Method]conditioning on the seeds germination when imbibed at low temperature. Result]The study tests the relative electric conductivity,germination rate,germination index and vigor index of Allium galanthum seeds germinated for 1 d,2 d,3 d,5 d and 7 d at 5℃ imbibitional experiment and treated with different PEG concentrations of 0%,10%,15%,20%,25% and 30% respectively. After analysis of variance the results show that Allium galanthum L. has imbibitional chilling when imbibed at 5℃. Conclusion]The germination is inhibited when the treatment time is longer than 2 days. The germination can be improved significantly when treated with PEG at the same condition,and the suitable PEG concentration which control the seed germination increased with the extending of time of the low temperature treatment.