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Bulletin of Botanical Research ›› 2021, Vol. 41 ›› Issue (5): 712-720.doi: 10.7525/j.issn.1673-5102.2021.05.009

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Effect of the Environment-friendly Nutrient Synergist Polyaspartic Acid on the Growth of Poplar Seedlings

Dan CAO, Shi-Zhen WANG, Mei HAN()   

  1. College of Biology and the Environment,Co-Innovation Center for Sustainable Forestry in Southern China,Nanjing Forestry University,Nanjing 210037
  • Received:2020-12-10 Online:2021-09-20 Published:2021-07-05
  • Contact: Mei HAN E-mail:sthanmei@njfu.edu.cn
  • About author:CAO Dan(1996—),femal,master student,majoring in plant biochemistry and molecular biology.
  • Supported by:
    National Natural Science Foundation of China(31700525);The Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)


Polyaspartic acid(PASP) is an environment-friendly polymeric substance that has been frequently used as fertilizer synergist and sustained release agent in agriculture. In order to investigate the effects of PASP on nitrogen uptake and utilization in poplar seedlings, 12 gradient treatments of different concentrations of nitrogen and PASP were set in the hydroponic-grown poplar hybrid ‘Nanlin 895’ seedlings. The results showed that the addition of PASP in nutrient solution had an obvious promoting effect on poplar growth and development when nitrogen supply was inadequate, and it improved the plant height, number of leaves and shoot biomass and the utilization efficiency of nitrogen, whereas the root to shoot ratio and nitrate concentration in seedlings was decreased. However, the exogenous supplement of PASP aggravated the stress of high nitrogen under the condition of high nitrogen. The results demonstrated that PASP could be used as fertilizer synergist for poplar, and the appropriate addition of PASP under insufficient nitrogen conditions would promote growth performance of poplar seedlings.

Key words: poplar hybrid ‘Nanlin 895’, polyaspartic acid, nitrate reductase, aspartate aminotransferase, nitrogen use efficiency

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