不同处理对银沙槐种子休眠破除和幼苗生长的影响

Effects of different treatments on seed dormancy breaking and seedling growth of Ammodendron argenteum

关键词:  银沙槐  种子  休眠破除  幼苗生长

Key words:  Ammodendron argenteum  seed  dormancy breaking  seedling growth

摘要:

对银沙槐种子破除休眠的适宜方法及其幼苗生长进行研究。结果表明:破口和沙磨处理休眠破除效果最好,但容易引起种子腐烂死亡; 分别用65、80和95 ℃热水处理种子,以95 ℃ 1 min破除种子休眠效果最好,且幼苗长势好,65 ℃效果最差,80 ℃可破除部分种子休眠,除80 ℃外延长热水处理时间可导致死种子数增加,95 ℃则引致大部分种子死亡; 液氮浸种处理效果均显著,其中以液氮处理10 min效果最好,但幼苗多为不正常苗而致死; 硫酸处理以浸种120 min效果最好,但处理时间过长可导致死种子数增多,且造成少数幼苗根部腐蚀死亡。综上所述,打破银沙槐种子休眠的较优处理方法是硫酸120 min浸种处理和 95 ℃ 1 min 热水处理

Abstract:

This paper studied the approriate method to break Ammodendron argenteum seed dormancy and the status of its seedling growth. The results showed that the most effective methods to break dormancy were slit testa and sand grinding. However,they could easily cause rot and death of the seeds. Use 65 ℃,80 ℃ and 95 ℃ hot water seeds treatment respectively and it was the 95 ℃ hot water treatment for 1 min that had the best breaking dormancy effect and the seeds grew well. 65 ℃ hot water treatment had the worst effect and 80 ℃ hot water could partially break the seeds dormancy. Except seeds under 80 ℃,extending hot water treatment time would increase the seeds death toll and most of the seeds under 95 ℃ died in extension period. The effects of seed soaking with liquid nitrogen treament were all significant,in which 10 min's seeds soaking was most effective in breaking domancy,nontheless,with abnormal seedling growth leading to death. Soaking with sulfuric acid for 120 min had the best effect in breaking seed dormancy. However,overtime treatment would increase the number of dead seeds and cause rot and death of a few seedling roots. In conclusion,soaking with sulfuric acid for 120 min and 95 ℃ hot water treatment for 1 min was the better method to break A. argenteum seed dormancy.