摘要
本文以杉木种子和纳米TiO_2为实验材料,研究不同浓度(50、100、500、1000 mg·L-1)纳米TiO_2溶液对杉木种子萌发、幼苗生长及生理特性的影响,探究纳米材料对林木种子萌发及幼苗生长发育的调节作用。结果显示:纳米TiO_2溶液对杉木种子发芽率、发芽势、发芽指数、活力指数均有促进作用,促进作用随处理浓度的增加呈现先增强后减弱的趋势,且100 mg·L^(-1)溶液处理对种子发芽指标提高效果最佳,分别比对照增加66%、92%、71%和299%;杉木幼苗的鲜重和根长均在100 mg·L^(-1)时达到最大值,分别比对照显著增加35%和143%。500 mg·L^(-1)纳米TiO_2溶液处理显著提高了CAT、SOD和POD活性,分别比对照提高108%、488%、182%,但降低了MDA含量(降低82%)。研究表明,适当浓度纳米TiO_2溶液处理不但能有效促进杉木种子萌发与幼苗生长,而且能改善幼苗的生理功能,可能会增强其对逆境的适应能力。
A study was carried out to investigate the effects of nano-TiO2 and regulation of nanometer materials on seed germination, seedling growth and physiology of Chinese fir under various concentrations of nano-TiO2（50, 100, 500, 1000 mg·L-1）. It was revealed that seed germination rate, germination energy, germination index, vigor index were significantly affected by nano-TiO2. This effect was positively correlated with low concentration but high concentration decreased germination rate and seedling growth. The seed germination rate, germination energy, germination index, vigor index were maximum with nano-TiO2 at 100 mg·L-1, with an increase of 66%, 92%, 71% and 299% compared to the control. The fresh weight and root length of Chinese fir seedlings reached the maximum at the 100 mg·L-1 treatment, which were 35% and 143% higher than those of the control. In the 500 mg·L-1 treatment, CAT, SOD and POD activities reached the maximum, which were increased by 108%, 488% and 182% respectively, but MDA content decreased by 82% compared with the control. This study indicated that low concentrations of nano-TiO2 not only promoted seed germination and seedling growth, but also ultimately improved physiological function and might enhance the resistance of Chinese fir to adverse conditions.
出处
《生态学杂志》
CAS
CSCD
北大核心
2017年第5期1259-1264,共6页
Chinese Journal of Ecology
基金
国家自然科学基金项目(31570448)
福建省高校新世纪优秀人才计划项目(K8015053A)资助
关键词
生长发育
形态可塑性
生理功能
抗氧化系统
纳米材料
growth and development
morphological plasticity
physiological function
antioxi-dant system
nanometer material
