西南林业大学学报2024，Vol.44Issue(11)：21-28,8.DOI:10.11929/j.swfu.202401032
PEG处理对山梨种子热休眠的预防作用研究
The Preventive Effect of PEG Treatment on Thermal Dormancy of Pyrus ussuriensis Seeds
摘要
Abstract
To investigate the effects of PEG priming and osmotic treatment on the induction of the germina-tion indicators and endogenous hormone content of Pyrus ussuriensis seeds,the primary dormancy released seeds of P.ussuriensis was used as experimental materials,the germination performance of P.ussuriensis seeds treated with different mass fractions(5％,25％,50％)of polyethylene glycol(PEG)solution for different durations(0.5,1,2 d)or osmotic treatment for different durations(l,3,7 d)at high temperature(25 ℃)was studied then select treat-ments with significant effects to measure changes in endogenous hormones in seeds.The results showed that both 25％PEG priming and osmotic treatment for 1 day could effectively weaken the induction of thermal dormancy in P.ussuriensis,achieving a preventive effect.The effect of PEG priming treatment on reducing seed thermal dormancy is better than that of osmotic treatment.When treated with 25％PEG solution for 1 day,the germina-tion rate of seeds was increased by 57％,the germination index was increased by 0.65,and the average germina-tion time was shortened by 7.88 d.PEG priming can prevent P.ussuriensis seeds from entering thermal dormancy by increasing the endogenous ETH and GA3 content in the early germination stage and reducing ABA content.关键词
山梨/种子萌发/热休眠/渗透处理/内源激素Key words
Pyrus ussuriensis/seed priming/thermal dormancy/osmotic treatment/endogenous hormones分类
农业科技引用本文复制引用
董博文,朱美如,刘婷,张鹏..PEG处理对山梨种子热休眠的预防作用研究[J].西南林业大学学报,2024,44(11):21-28,8.基金项目
国家自然科学基金项目(31870615)资助. （31870615）
