不同光照和赤霉素对高山红景天种子萌发与幼苗生长的影响

Effects of Different Light and GA_3 on the Germination and Seedling Growth of Rhodiola sachalinensis

目的:提高种子发芽率,研究高山红景天种子萌发特性。方法:考察了在光照和黑暗条件下,浸于水中和湿润条件下的种子萌发;不同光质(黑暗、白光、蓝光、绿光、红光和远红光)照射时间,不同浓度的GA3以及100mg/L GA3处理不同时间对高山红景天种子萌发的影响;不同温度对高山红景天幼苗生长动态变化的影响。结果:高山红景天种子属光萌发种子,光照条件下水中浸种萌发能显著提高其发芽率,发芽率为83.3%;白光、红光和绿光照射能显著提高种子发芽率,发芽率分别达84.0%、70.7%和52.0%;而且白光照射9 h的发芽率最高;GA3促进高山红景天种子的萌发,暗条件下浓度为100 mg/L GA3处理种子3 h,发芽率达到80%;20℃的温度有利于高山红景天幼苗的生长,其株高、鲜重和干重的生长达到了最大值;播种后35 d,其株高生长速度明显加快,50 d后幼苗干物质积累开始明显增加。结论:实验确定了高山红景天种子萌发和幼苗生长的最佳条件,为利用有性繁殖技术和规模栽培高山红景天提供了基础理论依据。

Objective：To improve germination rate and research the seed germination character of Rhodiola sachalinensis.Methods：Made seed germinated under water or with moisture,at light or dark condition.effects of 6 different light qualities（black,white,blue,green,red and far red light）illumination on seed germination were studied.The seedling growth at different temperature were studied as well.Results：The results indicated that light was required for Rhodiola sachalinensis seeds germinate,83.3% germination rate at light and soaking in watercondition;Seed germination were improved to 84%,70.7% and 52.0% respectively in white,red and green light quality illumination,the germination rate reached 84% after 9 h of white light illumination.Germination rate were 80% after 100 mg/L GA3 treatment for 3 h under dark condition.20 ℃ was the optimal temperature for Rhodiola sachalinensis seedling growth,under whith the plant height,fresh weight and dry weight of plant were the best.Seedling growth rate and the dry weight increased obviously at 35 d and 50 d.Conclusion：The experiment definited the best condition for Rhodiola sachalinensis seed germination and seedling growth,supplied basic data for large scale planting Rhodiola sachalinensis using seed propagation technology.