表油菜素内酯对提高烟草种子活力机理的研究

Study on the Physiological Mechanism of the Tobacco Seed Vigor Increased by 24-Epibrassinolide (BR)

本研究表明,用表油菜素内酯(24—Epibrassinolide,简称BR)0.05ppm或0.01ppm浸泡烟草种子24小时后,种子的电导率和渗出液紫外光OD值降低,吸氧量增加,乙烯释放速度和释放量增大;烟草种子萌发时间缩短,其发芽率、萌发系数和发芽势分别高于对照10%、30%和15%以上;幼苗植株干重及根长和根干重明显地增加;幼苗生长势及其抗逆性增强.

The results of this experiment showed that after the submerged treatment in BR 0.05ppm or 0.01ppm solution for 24 hours, the electric conductivity ratio and absorbance of ultraviolet rays (264nm) of the exudate of the tobacco seed (NC89) declined, but the absorbing oxygen and the ethy-lene production of the seeds increased. We also found that the seeds submerged in BR solution germinated more rapidly, and their germinating rate, index of their germination and their germinating power were higher than these of the seeds submerged in pure water respectively. In addition, we observed that the dry weight of the seedling plants of the treated seeds and the length and dry weight of their roots were obviously increased, and the growing tendency of seedling and their resistance to stress were also increased.