东北刺人参种子萌发影响因子的研究

东北刺人参(Oplopanax elatus Nakai)种子透水性良好,休眠后萌发不受其影响.种皮和胚乳的水提取物中存在萌发抑制物质,胚乳中提取物对白菜种子萌发的抑制效果比种皮更明显.种子自然脱落时胚尚未分化完全,处于心形胚阶段.种子需要先温暖层积以完成胚的分化与生长,然后转入低温层积完成生理后熟.同批种子胚的发育不完全同步,变温层积处理7个月有极少数种子萌发,连续变温层积处理17个月大部分种子萌发.不同年份受气候条件影响,种子产量和发芽率差异较大.种子耐贮性较强,贮藏2年的种子生活力变化不大,仍具有较高的萌发潜力.

Factors Influencing Seed Germination of Oplopanax elatus Nakai

This paper describes factors in seed germination of Oplopanax elatus Nakai. The water permeability of seeds was good enough to support seed germination. The water extracts of the seed coat and endosperm had some germination inhibitors, and the inhibitory effect of the extracts from endosperm was stronger than that from the seed coat. The embryos were not fully differentiated (in the cardioid stage) and were in deep dormancy when seeds matured. The seeds must be stratified under warm conditions to complete differentiation and development of the embryos, then under cold conditions to complete the physiological ripeness. The development of embryos in different seeds within a seed lot were not synchronous. By changing the tempera- ture stratification for 7 months, only a few seeds were able to germinate, but after 17 months, most of the seeds were able to germinate. Influenced by annual climate conditions, the yield and germination rate of seeds collected in different years varies greatly. The seeds can be stored for a long time; the germination ability of seeds stored for 2 years was still high.