不同地区洽草种子萌发特性的比较

Comparison of Germination Characters of Koeleria cristata Seed in Different Areas

对来自不同地区的5个洽草种群的种子做了不同的处理萌发试验,结果表明:总的来说在3种温度处理的对照组中,洽草种子在25℃恒温下的萌发率效果最佳,低温显著降低了洽草种子的萌发率。而利用赤霉素浸泡种子后,在15℃恒温下所有洽草种群的种子萌发率从50%左右都提高到87%,萌发总天数缩短了8～10d;而在25℃恒温下,除了大青山的DY、DS洽草种子外,其他3种洽草的萌发率都提高。经过硫酸铜处理后只有来自锡林郭勒白音希勒(XD)地区洽草种子萌发率提高了0.2个百分点,其它经过硫酸铜处理的洽草种子平均萌发率下降了7～15个百分点;在15℃恒温下,经过硫酸铜处理的洽草种子都没有萌发。

At different temperatures and pharmaceutical treatment, we studied germination characteristics of 5 Koeleria cristata （L.） Pets population＇s seeds from three regions. The results showed that： （1）In 25 ℃ constant temperature, the average germination rate of Koeleria cristata （L.） Pers seeds are 88.16%,total germination time is 8d; In varied temperature and 15 ℃ constant temperature,the average germination rate are 80% and 50.8%, total germination time is 13d and 14d, low temperature significantly reduced germination rate and delayed the germination process of Koeleria cristata （L.） Pers seeds. （2）In 25 ℃ constant temperature, Koeleria cristata （L.） Pets seeds from Da Qing Shan region had highest germination rate, is up to 94%; In varied temperature, Koeleria cristata （L.） Pers seeds from Zhao He region had highest germination rate,is up to 85.20 %. （3） after soaking the seeds in gibberellic acid, in 15 ℃ constant temperature all seeds germination rate generally increased from 50% to 87% and the total germination time shortened by 8-10d;But in 25 ℃ constant temperature germination rate of k seeds from Da Qing Shah region decreased to 84%, from the Xilin Go LE Grassland, Zhao He grass region have been increased.