低温对羊草和牧冰草种子萌发率的影响(英文)

Effects of Low-temperatures on Seed Germination of Leymus chinensis and Pascopyrum smithii.

在25℃、5℃、4℃和18℃温度条件下,对根茎禾草羊草和牧冰草种子分别处理一周和两周,并置于玻璃培养皿和土壤盘中进行发芽检测,结果表明:3种低温处理的种子萌发率均有显著提高;羊草种子在处理温度为5℃、4℃和18℃时, 萌发率基本一致,显著高于25℃处理;牧冰草种子随着处理温度的降低,萌发率显著提高,以18℃处理效果最好;7d的低温处理效果显著高于14d;在室温、16h光照和8h黑暗条件下,土培的种子萌发率极显著高于置于玻璃培养皿的种子萌发率。

The seeds of Leymus chinensis and Pascopyrum smithii were treated at 25℃,5℃,-4℃ and -18℃ for one week and two weeks respectively, then were placed in petri dishes and soil beds. The results showed that the germination percentages of the two species signally increased with the treatments at the 3 low temperatures. For 6 and 18 months old seeds, there were no significant differences in the germination percentages of Leymus chinensis among the treatments at 5℃, -4℃ and -18℃, the germination percentages treated at 5℃, -4℃ and -18℃ were much higher than that at 25℃, and the percentages of Pacsopyrum smithii increased with the treating temperature getting lower, treatment at -18℃ was the most effective. The percentages were higher with the treatment for one week than for two weeks. Under the condition at ambient temperature for 16 hours in light and 8 hours in darkness, the germination percentages were much higher in beds with soil than those in the glassine petri dishes no matter at which treating temperature.