摘要
以油松为材料,研究了不同浓度(50～2000mg/L)的纳米TiO2对油松种子萌发及幼苗生长和生理特征的影响,以探讨纳米材料对林木生长发育的调节作用。结果显示:各浓度纳米TiO2处理对油松种子萌发、幼苗生长及生理功能的改善均有一定程度的促进作用,且促进效应随着处理浓度的增加呈先升后降的趋势;1000mg/L纳米TiO2处理对种子发芽率、发芽势、发芽指数、活力指数、苗高、鲜重的提高以及霉变率的抑制作用效果最佳,它们依次分别比对照极显著提高28.00%、18.00%、12.36%、126.95%、19.57%、36.89%和下降15.33%(P<0.01);500mg/L纳米TiO2能最有效增加油松幼苗根长、根系活力及其叶片蛋白质含量、SOD活性、POD活性,降低其细胞质膜相对透性和丙二醛含量,它们分别比相应对照极显著增加111.91%、53.85%、16.32%、170.93%、141.94%和降低45.18%、51.27%。研究表明,适当浓度的纳米TiO2处理不仅能显著促进油松种子的萌发和幼苗生长,而且能改善幼苗的生理功能,增强其抗逆能力。
To understand the regulating effect of nano-meter materils on the growth and development of forests,we examined the effects of 50～2 000 mg/L nano-meter TiO2 on the seed germination,seedling growth and physiological function of Pinus tabulaeformis.The results were as follows.Different concentrations of nano-meter TiO2 could all increase the seed germination,seedling growth and enhance physiological function to some degree,and the positive effects increased fast and then slowly with the rise of treatment concentrations.The 1 000 mg/L treatment had the best effect in increasing seed germination rate,germination index,germination energy,vigor index,seedling height and fresh weight and reducing mildewing rate,which were increased by 28.00%,18.00%,12.36%,126.95%,19.57%,36.89% and decreased by 15.33% respectively compared with the contrast.The 500 mg/L treatment had the best effect in increasing root length,root system activity,protein content,SOD and POD activities and decreasing the relative cell membrane permeability and malondialdehyde content,which were increased by 111.91%,53.85%,16.32%,170.93%,141.94% and decreased by 45.18% and 51.27% respectively compared with that of the contrast.The statistical analysis results showed that there were significant difference of all above indexes between optimal concentration treatment and contrast.It proved that proper concentration of nano-meter TiO2 could not only increase seed germination and seedling growth,but also ultimately improve physiological function and resistance to adversities of P.tabulaeformis＇s.
出处
《西北植物学报》
CAS
CSCD
北大核心
2009年第10期2013-2018,共6页
Acta Botanica Boreali-Occidentalia Sinica
基金
江苏省高校自然科学基金项目(05KJB220053)
关键词
纳米TIO2
油松
种子萌发
幼苗生长
生理功能
nano-meter TiO2
Pinus tabulaeformis
seed germination
seedling growth
physiological function
