摘要
为解决欧洲花楸(Sorbus aucuparia)种子育苗技术问题,研究了不同低温沙藏处理和赤霉素浸泡对5个种源种子发芽的影响。研究结果表明:与5～6℃变温沙藏(平均5.6℃)相比,先2.9℃沙藏60d再5℃沙藏至播种的两段恒温沙藏处理其种子发芽时间有所推迟(0～24d),但发芽率明显提高,如2,3,6号种源的发芽率由变温沙藏的1%以下分别提高到15%,57.8%,14%。然而4号、5号种源的发芽率2种处理间无明显差异,说明不同种源的催芽条件有差别。赤霉素溶液浸泡利于打破种子休眠提高发芽率,用不同浓度赤霉素浸泡后再5～6℃变温沙藏的2号种源种子的发芽率从未经赤霉素处理的0.3%提高到12.6%～42.0%,最佳赤霉素浓度为200mg/L。
Low germination rate is a key factor influencing seed germination of the European Mountain- Ash （Sorbus aucuparia ）. This study focused on the effects of the treatments of stratification and gib- berellin soaking on the seed germination rate of 5 different Sorbus aucuparia provenances from different altitudes of European Alps. Compared with the stratification under a varying temperature within the range of 5--6℃（at an average of 5.6℃ ）, the time for beginning germination after the stratification with a two-stage temperature treatment （firstly 2.9 ℃ for 60 days and then 5℃till sowing） was postponed by 0--24 days, indicating the temperature of the stratification affects the germination speed. However, the germination rate after the two-stage temperature stratification was obviously higher than those after the stratification with a varying temperature in range of 5--6℃. For example, the germination rate for the provenances of No. 2, 3 and 6 was increased from less than 1% to 15%, 57.8% and 14% respectively .However, there was no difference in germination rate between the 2 stratification treatments for the provenances of No. 4 and 5, indicating different characters among provenances. A treatment of a 6--8 h soaking in gibberellin solution was helpful to break the seed dormancy and increase the germination rate obviously. The germination rate after the soaking in gibberellin solution with the concentration of 50-300 mg/L increased the germination rate of the provenance No. 2 from 0.32 % （as blank control） to 12.6 %--42.0%, with an maximum rate from the gibberellin eoneentration of 200 mg/L.
出处
《吉林农业大学学报》
CAS
CSCD
北大核心
2009年第5期595-599,606,共6页
Journal of Jilin Agricultural University
基金
国家林业局"948"项目(2007-4-10)
科技部"十一五"科技支撑计划项目(2006BAD03A1803)
宁夏六盘山森林生态站
国家林业局森林生态环境重点实验室项目
关键词
欧洲花楸
低温沙藏
赤霉素处理
发芽率
发芽时间
European Mountain-Ash （ Sorbus aucuparia ）
stratification
gibberellin （GA） treatment
germination rate
germination time
