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The effects of nanoTiO2 on seed germination, seedling growth and physiology of Chinese fir.

LI Yan-juan1,2, ZHUANG Zheng1,2, LIU Qing-qing1,2, SHANG Tian-she1, HUANG Qin-zhong3, ZOU Jia-yong4, LIU Bo1,2*   

  1. (1College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China; 2State Forestry Administration Engineering Research Center of Chinese Fir, Fuzhou 350002, China; 3Baisha National Forest Farm, Shanghang 364200, Fujian, China; 4Weimin National Forest Farm, Shaowu 354006, Fujian, China).
  • Online:2017-05-10

Abstract: 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.

Key words: straw returning, nutrient, soil water, nitrogen fertilizer, maize yield.