PEG与低温对法国百里香种子萌发的影响

以法国百里香(Thymus vulgaris)为材料,研究了PEG模拟干旱胁迫和低温对种子萌发和幼苗生长的影响,旨在探索进口百里香种子播种育苗的适宜条件。结果表明,温度、干旱及其互作对法国百里香种子萌发和幼苗生长均有显著影响。0~10% PEG-6000水分条件下,8~24 ℃下法国百里香种子均能良好萌发,其中在10~12 ℃时发芽率最高,达79.3%,显著高于其余各处理(P<0.05)。当PEG-6000达15%时显著抑制其萌发,至30% PEG-6000时仅在22~24 ℃下少量萌发。萌发后,当温度为22~24 ℃,根长、茎长均显著高于其他处理。种子和幼苗生长均表现出对PEG模拟干旱胁迫和低温不同的响应。

Effects of drought and cold stress on seeds germination of Thymus vulgaris

In order to understand the optimal conditions for germination and seedling growth of import thyme seeds——Thymus vulgaris, the effects of PEG-simulated drought stress and low temperature on seed germination and seedling growth were measured. The analysis of two-way ANOVA showed that temperature, drought and their interaction significantly affected (P<0.05) the seed germination and seedling growth. The treatments with the temperature ranged from 8 ℃ to 24 ℃ and PEG-6000 ranged from 0 to 10% were optimal for seeds germination. The treatment with the temperature at 10 ℃ to 12 ℃ had the highest germination rate of 79.3%, which had significant difference from the other treatments (P<0.05). The treatments with 15% PEG-6000 could significantly inhibit (P<0.05) seed germination. Under the treatments with 30% PEG-6000, seeds only could germinate at 22 ℃ to 24 ℃. The root and shoot length under treatments with the temperature at 22 ℃ to 24 ℃ were significantly higher than the other treatments. Seeds and seedling growth had different response to PEG-simulated drought stress and cold.